Collaboration and knowledge generation in an 18-year quality improvement research programme in Australian Indigenous primary healthcare: a coauthorship network analysis.

OBJECTIVES: Though multidisciplinary research networks support the practice and effectiveness of continuous quality improvement (CQI) programmes, their characteristics and development are poorly understood. In this study, we examine publication outputs from a research network in Australian Indigenous primary healthcare (PHC) to assess to what extent the research network changed over time.
SETTING: Australian CQI research network in Indigenous PHC from 2002 to 2019. PARTICIPANTS: Authors from peer-reviewed journal articles and books published by the network.
DESIGN: Coauthor networks across four phases of the network (2002-2004; 2005-2009; 2010-2014; 2015-2019) were constructed based on author affiliations and examined using social network analysis methods. Descriptive characteristics included organisation types, Indigenous representation, gender, student authorship and thematic research trends.
RESULTS: We identified 128 publications written by 308 individual authors from 79 different organisations. Publications increased in number and diversity over each funding phase. During the final phase, publication outputs accelerated for organisations, students, project officers, Indigenous and female authors. Over time there was also a shift in research themes to encompass new clinical areas and social, environmental or behavioural determinants of health. Average degree (8.1), clustering (0.81) and diameter (3) indicated a well-connected network, with a core-periphery structure in each phase (p≤0.03) rather than a single central organisation (degree centralisation=0.55-0.65). Academic organisations dominated the core structure in all funding phases.
CONCLUSION: Collaboration in publications increased with network consolidation and expansion. Increased productivity was associated with increased authorship diversity and a decentralised network, suggesting these may be important factors in enhancing research impact and advancing the knowledge and practice of CQI in PHC. Publication diversity and growth occurred mainly in the fourth phase, suggesting long-term relationship building among diverse partners is required to facilitate participatory research in CQI. Despite improvements, further work is needed to address inequities in female authorship and Indigenous authorship. © Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

A study strength was the long time frame of 18 years of publications from an Australian quality improvement research network.

To the best of our knowledge, this study is the first to describe a continuous quality improvement research network using coauthorship network analysis.

Our analysis does not include the multiple affiliations of many of the authors and so may under-report the level of collaboration.

Coauthorship is only one indicator of collaboration, though it has several advantages to relying on it as a proxy for assessing research collaboration including its verifiability, stability over time and availability in the public domain.

Many other collaborative efforts are not reflected in coauthorship metrics, such as collaborations that continue to occur through coauthorship, grant submissions and conference presentations.

Introduction

Over the past two decades, continuous quality improvement (CQI) programmes have been widely taken up by primary healthcare (PHC) services caring for Aboriginal and Torres Strait Islander people (hereafter respectfully referred to as Indigenous people, acknowledging their cultural and historical diversity) across Australia.1 2 CQI—a set of methods for improving the quality of care, through continuous measurement and problem-solving techniques3 4—has been found to improve the quality of care delivered in Indigenous PHC.1 5

While evidence indicates no single model of CQI outperforms others, the most successful applications of CQI are multisite and multifaceted approaches that aim to achieve change at various levels of the health system.6 We and others have argued the need for multidisciplinary research networks to support the practice and effectiveness of CQI6 7 and to foster coproduction and sharing of knowledge. However, despite research networks often being touted as a solution for enhancing knowledge translation into policy and practice, their characteristics and emergence over time are poorly understood.8–10 Furthermore, evaluation challenges can be considerable because research networks are often loosely defined and manifest in different forms with formal and informal organisational structures.11 12

We sought to better understand the development and growth of a multidisciplinary research network in Indigenous PHC quality improvement, and how these aspects reflected the vision of the network with respect to capacity strengthening, equity and membership diversity. Coauthorship network analysis offers one feasible strategy for evaluating the growth and emergence of research networks, because publications are well documented and reflect collaboration.13–15 The study uses coauthorship network analysis to examine the growth and change in an 18-year CQI research network in Australian Indigenous PHC. We address the question: How did the research network expand and change over time? Specifically we will investigate the extent to which the research network brought together people from a variety of organisations; the structural characteristics of the network; the level of equity in authorship relative to Indigenous status and gender; capacity strengthening efforts through examining student authorship; and changes in research themes over time.

The setting

Although Australia has a high-performing health system, underpinned by a universal health insurance scheme, it ranks low on measures of equity when compared with other Organisation for Economic Co-operation and Development nations.16 This ranking is reflected in consistent underperformance in addressing inequities in healthcare access, quality of care and outcomes for Indigenous people.17–19 These inequities are underpinned by a legacy of colonisation, land dispossession, displacement, disempowerment, social and economic exclusion and ongoing racial discrimination.19 20

To help address these inequities, the Audit and Best Practice in Chronic Disease (ABCD) participatory action research programme was initiated in 2002. Drawing on international evidence about the effectiveness of system-wide CQI approaches to improve the quality of PHC service delivery,21 the ABCD programme employed a systems approach to support the CQI efforts of PHC services established to provide care for Indigenous Australians.1 6 22 Connected to this research programme, in 2010 a national, not-for-profit, CQI support entity—One21seventy—was established to support Indigenous PHC services in implementing CQI cycles using standardised, evidence-based, best practice clinical audit and systems assessment tools. Notably, 175 of the over 275 PHC centres involved provided the research network with deidentified data derived from their use of the CQI tools and processes. The studies published by network members reporting analyses of these data form a comprehensive picture of the quality of PHC received by Indigenous people around Australia.1 Between 2010 and 2016, ABCD research accounted for 42 of the 60 (70%) peer-reviewed publications identified in a systematic review on CQI in Indigenous PHC in Australia,2 and also made a significant contribution to international CQI research.23 Importantly, although there were demonstrated improvements in quality of care in some areas of clinical care, there was continuing wide variation between PHC centres and jurisdictions.1 5

Table 1 sets out the four distinct phases of the ABCD programme’s evolution from 2002 to December 2019, its research aims, systems-strengthening dimensions and main findings. The intention of the resulting network was an ‘open collaboration’ that actively encourages cooperation with other organisations and individuals to help achieve the programme’s aims. The current phase of research (2020–2024) is included in table 1 but was not part of this study.

Table 1

Phases and research focus of the ABCD programme, an action research project implementing quality improvement in Indigenous PHC, 2002–2019

	Phase 1exploring feasibility and acceptability of CQI tools and processes	Phase 2exploring scalability and expansion of CQI	Phase 3supporting wide-scale implementation of CQI and development of partnership learning model		Phase 4embedding CQI approaches in systems	Current phase (not part of study)strengthening leadership and engagement in system wide CQI
	ABCD (2002–2004)	ABCD Extension(2005–2009)	ABCD National Research Partnership (2010–2014)	One21seventy(2010–2016) service support arm	Centre for Research Excellence in Integrated Quality Improvement (CRE) (2015–2019)	CRE in Strengthening Systems for Indigenous Healthcare Equity (CRE-STRIDE) 2020–2024*
Research aims	Explore whether a CQI approach was feasible and effective in Indigenous PHC.43	Identify support requirements for large-scale implementation of the ABCD model.44	Understand variation in quality of care and strategies for improvement.22	Primarily a service support function. Voluntary contribution of data by services for research purposes, and potential for other involvement of services in research.	Accelerate and strengthen large-scale CQI efforts. Explore the feasibility/functioning of an ‘innovation platform.’32 33	Strengthen Indigenousleadership for CQI. Extend CQI methods to sectors beyond the PHC clinical environment.41 Enhance community participation in CQI processes.
Health system strengthening dimension	Using participatory action research, a CQI process was introduced to 12 Indigenous PHC centres in one jurisdiction (Northern Territory) with a focus on the prevention and management of chronic disease.45 CQI approach embraced to improve (and demonstrate) quality of care. Systems assessment tool provided a mechanism for ongoing local system improvement and integration with other organisations and sectors.46	Geographic scope of the project was extended to include 69 Indigenous PHC services in several jurisdictions across Australia. Scope was broadened to address other priority areas of PHC, with audit tools for additional areas of care. Informed health system planning and policy by showing how the ABCD approach could be scaled up, and examined barriers/enablers to engagement and improvement.	More than 175 Indigenous PHC services across Australia involved in ABCD programme.47 Brought together stakeholders from across jurisdictions and levels of the health system to support and guide research on priority PHC health system issues, and to contribute to refining CQI tools and processes, interpreting data, applying findings and sharing lessons.47	Provided CQI training and tools with systems thinking focus, and web-based data analysis and reporting system able to provide local and aggregated data reports, with benchmarking. 275+ health services used ABCD tools and processes, and more than 2500 PHC staff were trained in the use of CQI tools and processes.47	Adapted and extended the Partnership Learning Model, developed through previous phases of the research, by engaging with a wider range of stakeholders responsible for Indigenous PHC to solve problems and innovate together. Emphasis on research capacity strengthening and research translation.48	Develop new knowledge to strengthen integration in comprehensive PHC and embed CQI at all levels of the PHC system. Strengthen Indigenous community input into improving CQI processes. Extend CQI processes and collaborations across sectors.
Research findings	CQI approach was well accepted, demonstrated the feasibility and application of tools and processes, and showed improvements in care and intermediate health outcomes.	Identified key barriers and enablers to scaling up in an Indigenous context.49 Established the need for further tools to support the implementation of CQI in Indigenous PHC.	Demonstrated improvements in quality of care in some areas, and continuing wide variation between PHC centres and jurisdictions.1 5 Developed Partnership Learning Model to achieve large-scale improvements in quality of care and population health outcomes.6	+70% of PHC centres engaged in One21seventy provided their de-identified data to the ABCD National Research Partnership for use in research.	Established that clinical and other areas such as community health promotion and prevention outcomes can be improved by using evidence-based CQI tools and processes.50 Identified factors that support the effective use of CQI by PHC teams and services, and improvements in delivery of care.51 Identified priorities for strengthening PHC systems to achieve large-scale health improvements.52 53	Not applicable
Funding source†	NHMRC Fellowship. Grant No: *283 303 Cooperative Research Centre for Aboriginal Health	Cooperative Research Centre for Aboriginal Health and the Australian Commission on Safety and Quality in Healthcare	NHMRC Partnership Scheme *54 267	Not-for-profit/cost-recovery service agency	NHMRC Centres of Research Excellence Scheme *1 078 927	NHMRC Centres of Research Excellence Scheme *1 170 882

Adapted from Bailie et al.6

*CRE-STRIDE is the current form of the network, and its successful funding underscores the research programme’s longevity and stability.

†Although the projects were supported by research funding, it is important to note there were financial contributions and in-kind support from a range of community-controlled and government agencies.

ABCD, audit and best practice for chronic disease; CQI, continuous quality improvement; NHMRC, National Health and Medical Research Council; PHC, primary healthcare.

Methods

We used social network analysis, as described by Fonseca et al13 in their health sector coauthorship network analysis, to retrieve scientific publications, standardise entries for authors and organisations, visualise the network and calculate metrics.

Data retrieval

Details of peer-reviewed journal articles and books (the ‘publications’) were retrieved from administrative records held by the Centre for Research Excellence in Integrated Quality Improvement (CRE-IQI) coordinating centre, and included all publications published from 2002 to 2019.

Data categorisation, standardisation and cleaning

Publications were sorted into categories and research themes that were iteratively developed and defined by JB and RSB. We describe the process for categorisation of included publications below.

Organisations

The affiliations of the authors (as per their citation on publications) were coded into universities and research institutes; government departments; health services; affiliates; primary health networks and non-government organisations. Where authors had more than one affiliation listed on the publication, we used the first affiliation provided. Other key points in the categorisation of publications were as follows:

We used the author’s university rather than their specific department and, if named, the research institute rather than the university.

Where an author’s affiliation was nominated as a hospital we used the State Health Department with which these organisations were affiliated.

‘Affiliates’ refers to regional support organisations established to support Indigenous health services, such as Aboriginal Medical Services Alliance Northern Territory.

‘Health Service’ refers to services established primarily to provide PHC to Indigenous people, and includes Aboriginal community-controlled services, government services and private general practice.

Primary health networks refer to independent regional PHC organisations across Australia that commission rather than provide services, as established by the Australian government in July 2015.

Non-government organisations refer to not-for-profit organisations that operate independently of government, typically with the purpose of addressing a social or political issue.

Research themes

Publications were assigned to one of the following three research themes:

CQI-related programme activities that address clinical care delivery in the PHC setting: publications that focus on the quality, and variations in delivery, of clinical care, and the application of, or learning from, CQI techniques in relation to a specific aspect of clinical care, for example, child health and chronic illness care.

CQI-related programme activities that address social, environmental or behavioural determinants—that is, community health promotion or prevention activities: publications that focus on the application of, or learning from, CQI with a focus on areas such as health promotion, social and environmental conditions, housing, food security and family well-being in general community settings.

CQI-related processes and approaches: publications related to CQI programme development (such as study protocols and reviews informing CQI approaches), health systems strengthening, and the development and evaluation of research collaborations and their impact.

In categorising the publications by research themes, abstracts of publications were retrieved and screened by blinded reviewers (JB and RSB). Inconsistencies in reviewer assessments were resolved by consensus.

Role type

We identified all authors who were students or project officers at the time of the publication, and who had authored in this capacity. The student category included Public Health Trainees, and Masters, PhD and Medical Honours students. Project officers were identified as those whose primary role supported research, and/or related either to healthcare administration and/or to project work.

Indigenous status

Coordinating centre records flagged authors who identified as Indigenous.

Gender

Authors were assigned a male or female category through a number of ways—reviewer knowledge of authors and Google searches.

Where there was uncertainty in allocating the above categories, JB checked with RSB and, when necessary, with the corresponding authors of the manuscripts. Data were entered into an Excel spreadsheet, and then standardised and cleaned by JB and BAP.

Network assembly, visualisation and analysis

The evolution of the research network was analysed over the four phases displayed in table 1, with the analysis split into three parts: (1) an analysis of publications by type of organisation represented, research themes, the role of authors, and the Indigenous status of authors; (2) the network analysis of coauthorship between organisations and (3) a core-periphery analysis of organisational position within the network.

Python programming language V.3.7.424 and the Jupyter Notebook25 application accessed through the Anaconda Navigator26 interface were used to script all data manipulation and analytical work. Network analyses used the Python package NetworkX,27 with visualisations produced with the open-source Gephi program.28

We first created a node list containing every organisation and its attributes (unique identifier, organisation name, type and years published), and an edge list representing coauthorship as pairwise combinations of each organisation listed on a publication and its unique attributes.

A single, undirected edge of weight=1 was assigned for each organisation pair that shared at least one publication in each phase of the network. For publications that involved only authors from the same organisation, a self-loop edge of weight=0 was assigned. No additional weight was given to the number of publications or authors involved or any other attribute. This approach was chosen so that results of the analysis could be directly interpreted in the context of interorganisational collaboration.

Networks were analysed discretely across the four phases. Several network measures (defined in table 2) were used to understand the resulting networks.

Table 2

Theoretical definitions of social network analysis measures, and their meaning in this study

Measure	Definition, meaning in this study and importance
Node	The basic unit of a network. Nodes represent organisations. The node size is proportional to the no of publications.
Edge or tie	An edge or tie connects two nodes in a network, and indicates a relationship between the two. An edge between two organisations indicates coauthorship of at least one publication.
Density	The density of a network is the total no of edges divided by the total no of possible edges. It is a widely used measure that reflects the level of cohesion among network organisations, or the extent to which organisations collaborated with every other organisation in the network.
Average degree	Degree is a count of the no of connections for any given node: the higher the average degree, the more connected the network. The average no of interorganisational collaborations per organisation.
Clustering coefficient	Clustering is a measure of how many of the nodes connected to a given node are also connected to each other, which is expressed as a proportion of the total possible connections. The overall clustering coefficient is the average across the network. Where density tells you how connected the network is, the clustering coefficient tells you how well connected the various neighbourhoods of the network are. A high clustering coefficient and low density can be an indication of lots of small groups, loosely connected.
Path/path length	The path is any connected series of edges between two nodes. The length of a path is the no of steps (edges) and shows how quickly organisations can communicate with each other through their links.
Geodesic distance	The geodesic distance is the shortest path of all possible options between two nodes in the network. The no of steps it takes to get across a network is a useful measure of how quickly information can be disseminated to the entire network.
Diameter	The diameter of the network is the ‘longest short path’ between nodes and indicates the maximum no of steps it would take to get between nodes that are furthest away from each other in the network. The diameter gives a useful indication of how broad the network is.
Centralisation	This reflects how tightly the organisations are connected around the most central point of the network and how reliant the network may be on a central node.
Discrete core-periphery model	A network with a core-periphery structure has a ‘core’ of nodes densely connected to each other and to others, and ‘periphery’ nodes in the less-connected ‘periphery’ that are connected only to core nodes.

The analysis of network position at the organisational level uses discrete core-periphery analysis29 to identify organisations that are well connected to each other (the core) as distinct from those less well connected (the periphery). To detect the core-periphery, we used the Borgatti and Everett29 algorithm and the non-parametric statistical test devised by Kojaku and Masuda.30

Patient and public involvement

No patients or members of the public were involved in the design, analysis or reporting of this study.

Results

We identified 128 publications written by 308 authors, with a median of six authors per publication (IQR=4–9.25), representing 79 different organisations (table 3). Most authors (182 or 59.5%) contributed just one publication, while 18 (5.9%) contributed 10 or more. The chief investigator (RSB) of the original ABCD programme coauthored 97 of the 128 publications (online supplemental file 1).

Table 3

Coauthorship characteristics, by phases and total 2002–2019

Indicator	Phase 1: 2002–2004	Phase 2: 2005–2009	Phase 3: 2010–2014	Phase 4: 2015–2019	Total: 2002–2019
No of publications	2	15	21	90	128
No of different authors	5	33	67	263	308
No of authors per paper (median, IQR)	5 (5–5)	5 (3.5–8.5)	9 (4 - 13)	6 (5 - 9)	6 (4–9.25)
Organisational involvement
No of nodes (organisations)	3	12	24	72	79
No and type of different organisations
University or research institute	3	8	15	45	48
Government department	–	2	3	9	10
Affiliate	–	1	4	2	5
Health service	–	1	2	11	11
Non-government organisation	–	–	–	4	4
Primary health network	–	–	–	1	1
No of publications with an author who has an international affiliation	0	1	0	8	9
Capacity strengthening
No and percentage of publications with a student/project officer as a lead author	0 (0%)	2 (13%)	3 (14%)	25 (28%)	30 (23%)
No and percentage of publications with at least one student/project officer as an author	2 (100%)	12 (80%)	13 (62%)	52 (58%)	79 (62%)
Addressing equity
No and percentage of female authors	1 (25%)	20 (60%)	39 (58%)	171 (65%)	192 (62%)
No and percentage of publications with a female first author	0 (0%)	2 (13%)	14 (67%)	76 (84%)	92 (72%)
No and percentage of publications with a female last author	0 (0%)	4 (27%)	6 (29%)	25 (28%)	35 (27%)
No and percentage of publications with at least one Indigenous author	0 (0%)	6 (40%)	13 (62%)	56 (62%)	75 (59%)
No and percentage of publications with an Indigenous lead author	0 (0%)	0 (0%)	2 (10%)	3 (3%)	5 (4%)
No and percentage of publications with an Indigenous last author	0 (0%)	3 (20%)	0 (0%)	0 (0%)	0 (0%)
Thematic trends in publications
Thematic areas, no and percentage
CQI-related activities in clinical care	2 (100%)	6 (40%)	8 (38%)	44 (49%)	60 (47%)
CQI activities in areas such as community-based health promotion and prevention	0	2 (13%)	5 (24%)	16 (18%)	23 (18%)
Processes and approaches for CQI	0	7 (47%)	8 (38%)	30 (33%)	45 (35%)
Coauthorship network structural characteristics
Density	1	0.45	0.47	0.11	0.13
Average degree (organisations)	2	5	10.9	8.1	9.8
Centralisation (degree)	0	0.65	0.57	0.55	0.53
Clustering	1	0.8	0.86	0.81	0.79
Geodesic distance	1	1.5	1.5	2.1	2.1
Diameter	1	2	2	3	3
Core-periphery structure	0	1 (p=0.03)	1 (p=0.01)	1 (p<0.001)	0.42 (p=0.83)

CQI, continuous quality improvement.

Linking people from a variety of organisations

As shown in table 3, there was an increase in the number and type of different organisations in the network, with considerable growth from phase 3 (24 organisations) to phase 4 (72 organisations). Of note, the number of universities and research institutes increased from 15 in phase 3 to 45 in phase 4, while Health Services rose from 2 to 11 and international organisations increased to 8. This growth in different organisations participating in the research network over time was a result of existing organisations continuing to publish together (yellow nodes), and new organisations coauthoring (blue nodes) (figure 1). A few organisations ceased publishing as part of the network (red nodes), shown as ‘isolates’.

Figure 1

Evolution of the quality improvement research network, 2002–2019.

Relationships of organisations and structural characteristics

The structural characteristics of the networks are based on the indicators shown in table 3. Our analysis of the network data shows a decrease in the network density. In phase 2 and 3, the research network was relatively well connected with ~46% of all possible relationships in the network actualised. However, in phase 4, with ~11% of all possible links existing between organisations, there was less connectivity between organisations. The decrease in network density was linked to an increase in the number of organisations publishing together in phase 4, as noted above (table 3), and an increase in the scope of CQI publications. However, the average clustering coefficient remained high across all phases (1, 0.80, 0.86 and 0.81, respectively), indicating a strong tendency for multiple organisations to be collaborating on individual publications. Part of this high effect is a natural consequence of authors publishing together—it introduces triangles of collaborating authors, thereby increasing the clustering coefficient.

From table 3, we note that the average number of organisations collaborating directly on publications (average node degree) steadily increased from 2 in phase 1, to 5, 10.9 and then 8.1 in subsequent phases. This is a sign that organisations collaborated more widely over time, with a small decrease in phase 4. On average, publications involved 3.4 organisations, with 3.5 publications per organisation. This indicates a maturation of organisational relationships, typically creating more than one publication from each collaboration. Furthermore, network diameter was at-most 3 (phase 4) and geodesic distance was at-most 2.1 (phase 4). This indicates a close-knit cohesive network in which organisations were connected by no more than two other organisations, resulting in the network being unlikely to fragment and able to disseminate information quickly.

The degree-centralisation from phase 2 was 0.65 followed by 0.57 and 0.55 in the subsequent phases. Conversely, the core-periphery analysis produced strong results in each phase (see table 3). These analyses indicate that in all four phases the network was not connected via a single dominant central organisation but rather by a core-periphery structure that points to a more collaborative network. Intersectoral collaboration (research, government and/or health services) were represented in the core for phases 2 and 3 (green nodes in figure 2). In phase 4, the organisations comprising the core were all universities or research institutes, indicating that government departments and health services were more likely to publish with them than with each other.

Figure 2

Core periphery analysis by phases, 2002–2019.

Equity in authorship

Female first authors increased over time, growing from none in phase 1 to 84% (n=76) in phase 4 (table 3), with about 28% of the publications having a female senior or last author in all phases after the first. Although the number of publications led by Indigenous authors remained low, over time there was an increasing number and percentage with at least one Indigenous author. The greatest expansion was observed from phase 3 to phase 4 when the number of publications with at least one Indigenous author increased from 13 to 56 (table 3).

Providing opportunities for capacity strengthening

Over time there was also an increase in absolute number (but a decline in percentage) of publications with at least one student or project officer author, from 2 in phase 1 to 52 in phase 4 (table 3). Phase 4 also saw an increase in student or project officer as lead author, with the largest growth in phase 4 (28%, n=25) representing a twofold increase from phase 3 (14%, n=3).

Expansion of research themes

As the network evolved there was a notable growth in publications related to CQI and clinical care, an increase in publications related to social, environmental and behavioural determinants of health, and on the development of processes and approaches for CQI (table 3). The growth in research themes in phase 4 was consistent with the increase observed in the number of publications and organisations involved in this phase, and the emergence of new core organisations. Online supplemental file 2 contains a listing of all publications and their assigned category of research themes.

Discussion

This study examined the growth of and changes in an Australian quality improvement research network over an 18-year period by assessing coauthorship of publications using network analysis. Key findings include an expansion in the number of publications; a greater number and diversity of organisations coauthoring; improvements in capacity strengthening measures reflected in increased student and project officer authorship and first author position; and a broadening or scaling-out31 of quality improvement work to other thematic areas. There is evidence, too, that the research network linked people from a variety of organisations, including universities or research institutes, PHC services and government departments, who might otherwise have never worked together. This expansion potentially extended both the impact of the network and of the organisations involved.

The characteristics of the network showed a strong collaborative structure and a maturation of organisational relationships, with more than one publication typically developed by each collaborating organisation. Network analyses indicated a core-periphery structure of organisations connected to each other in each phase, rather than a network structured around a single central organisation. As there was the same chief investigator throughout the study period, this finding of a core-periphery structure indicates the network expanded to have other core organisations over time, and was not just centred on the chief investigators organisation. In phases 2 and 3, the relationships between research institutions and government departments were well represented in the network core. The network’s founding partners maintained a consistent presence as members of the core, indicating that it remained dependent on these partners for collaboration. However, new core organisations emerged when key authors changed institutions, reflecting that individuals stimulated the expansion of core members. For example, a result of key individuals moving institutions and growing the publishing base was a phase 4 core comprised solely of universities and research institutes, whilehealth service and government organisations were part of the core in the earlier phases. This change occurred despite a large increase in the number and type of organisations involved in the network in phase 4.

Network growth was greatest in phase 4, when funding was received from the Australian government’s National Health and Medical Research Council (NHMRC) to establish a CRE and the network’s structure and function12 evolved to that of an ‘innovation platform.’32 Used as a vehicle to stimulate and support multistakeholder collaboration and learning, ‘innovation platforms’ provide a space of interaction to facilitate the development and emergence of innovations when there are complex, system-wide issues requiring coordinated action and collective problem solving. Most extensively applied in international agricultural development, and to a limited extent in health, innovation platforms differ from other networks by the incorporation of a wider network of stakeholders at multiple levels of the system and in different roles; the concept of ‘sector boundary spanning’ that brings in stakeholders from other sectors to assist in developing healthcare solutions; and application of continuous reflection, learning and adaptation as central design elements.32 33

These findings support previous literature that researchers tend to collaborate with like-minded others, but that this tendency toward homophily can be disrupted by implementing policies that encourage interdisciplinary collaboration and purposeful research translation—such as was done with the innovation platform.14 Although the purposeful adjustment to an ‘innovation platform’ was associated with an expansion of activity among the network and new thematic scope in publications, this acceleration could also reflect other inter-related factors, such as longer-term relationships, and an increase in funding.

Furthermore, the earlier phases were focused on supporting PHC services to implement and embed quality improvement techniques through participatory action research. Access to the CQI dataset formed the basis of research collaborations between those services and university and research institutes to undertake data analyses that resulted in publications up to 2019. Though there were 175 PHC services providing data to the research collaboration, only 11 health services coauthored publications. While not necessarily coauthors, health services made important contributions to implementing research, collecting data and importantly—to interpretation and analysis of findings.

Our findings build on a prior social network analysis of partners in the research network which was undertaken as part of an interim evaluation in phase 3 of the research network. Cunningham et al34 found an increase in network density (43%–59%) from 2013 to 2014, indicating an increase over time in connectivity and communication between partner organisations. A major element in achieving the goals of that phase of research was the network’s focus on developing a shared database of deidentified CQI data from Indigenous PHC centres.34 The importance to the research network of collecting and sharing data is supported by the experiences of other research collaborations.35 36 Furthermore, the high level of trust identified across the network is indicative of a properly functioning collaboration.37 The growth in phase 4 leveraged the high level of trust already established. The decreasing degree of centralisation scores are consistent with findings reported by Cunningham et al34 and reflect the shift towards more organisations taking a greater role in publishing. Increasing the number of diverse collaborations and creating a more decentralised network has been shown to improve productivity and increase the potential for high-impact science.38

Equity and capacity strengthening are promoted as core elements of research networks.12 39 The research network, particularly when operating as an innovation platform, made some progress in addressing concerns about the imbalances between Indigenous and non-indigenous authors when writing about Indigenous issues. However, despite an increased number of publications with Indigenous authors, especially in phase 4, there remains a paucity of Indigenous first or senior/last authors. Further work is needed to redress the inequities these imbalances represent, a concern echoed in global health literature.40 The latest iteration of the research network was recently launched with funding for a new CRE in Strengthening Systems for Indigenous Health Care Equity (2020–2024 (NHMRC Grant Id #1170882). This Centre marks the beginning of a new Indigenous leadership structure for the research network with more than half of the research investigators, including the chief investigator, identifying as Indigenous. It also aims to extend and further support the use of CQI methods in sectors with responsibility for addressing social and cultural determinants of health and to enhance community participation in CQI processes.41

Strengths and limitations of the study

A study strength was the long time frame of 18 years of publications. Although coauthorship is only one indicator of collaboration, there are several advantages to relying on it as a proxy for assessing the level of research collaboration, including its verifiability, stability over time, availability of data in the public domain and ease of measurement.11

As the aim of the study was to assess growth and change in the research collaboration over time, we applied an unweighted method to the network analysis. This approach was chosen for a number of reasons. First, the interpretability would be compromised by weighting edges, in the context of the questions we wished to answer. We moved all of the information that would have otherwise been embedded into a weight to separate descriptive analyses available in table 3. Second, given the temporal nature of collaborations we did not wish to make erroneous assumptions that quantity of publications is a substitute for quality. For example, it is difficult to compare a collaboration that generates only one high impact publication to a collaboration that may produce a larger number of lower impact publications. Weighting by publication numbers could therefore introduce a bias that may lead to erroneous interpretation of the findings.

Limitations of this study include: (1) many collaborative efforts are not reflected in coauthorship metrics. We are undertaking other studies to address this as part of the overall evaluation of the CRE-IQI. Other measures of collaborative ties include having coinvestigators on submitted or funded grants, on conference presentations and as authors of grey literature, all of which may be useful to broaden the definition of collaboration in our innovation platform. However, we assumed that, in most cases, coauthorship indicates an active cooperation between partners beyond the simple exchange of material or information. (2) This analysis does not capture the collaborations that continue to occur through coauthorship or other means that are not necessarily related to the research network. For example, a collaboration formed by coauthoring on a CRE-IQI manuscript might lead to collaboration on other projects and research not reflected in this analysis. (3) Because there is a substantial lead time for an academic publication, a writing collaboration that might have commenced in an earlier phase of work may not have been published until a later phase. Thus, publication in one phase can arise from substantial work in a previous phase. (4) Although multiple authorship affiliations are increasingly recognised as facilitating knowledge exchange and becoming more widespread,42 our analysis does not include the multiple affiliations of many of the authors and so may under-report the level of collaboration. Similarly, only representing the university affiliation, and not the actual department in which an author works, obscures collaboration between departments in the same university. (5) Three of the 11 authors on this manuscript (RSB, JB and VM) had published more than 20 manuscripts included in this analysis, and RSB was the chief investigator on the research network during this period. Given this, and to mitigate against bias, BAP who has not published as part of this network undertook the network analysis and there was a blind review process for categorising the manuscripts, with discrepancies discussed.

To the best of our knowledge, this study is the first to describe a CQI research network using coauthorship network analysis. While the generalisability of the findings may be limited to similar networks, the methodological approach could readily be transferred. In this study we did not set out to demonstrate a link between an expansion of the collaboration and engagement with impact or improvement in the quality of care. However, it is widely recognised in the literature, that increasing collaboration and engagement across health services, researchers and policy-makers is a critically important element along the causal change pathway to improving the quality of care and achieving impact. Methods such as coauthorship analysis are useful for demonstrating a pathway to research impact related to engagement, which traditionally tends to rely on the quantity of outputs rather than on the strengthening of networks and the scope of work undertaken.

Conclusion

Over the 18-year time frame, collaboration in publications increased with network consolidation and expansion. Publication outputs accelerated in the final phase, coinciding with a broader thematic focus and an increase in the number and diversity of participating organisations. This expansion occurred largely due to the cumulative effect of building trust and relationships over time, including the development of a comprehensive dataset for use by all stakeholders. The findings highlight the benefits of long-term relationship building among diverse partners to support participatory research in quality improvement. Increased productivity was associated with increased authorship diversity and a decentralised network, suggesting these may be important factors in enhancing research impact and advancing the knowledge and practice of CQI in PHC. Despite improvements, further work is needed to address inequities in female authorship and Indigenous authorship. The coauthorship analysis has been useful for demonstrating research impacts related to collaboration, which are not well captured by metrics such as quantity of outputs.