The Colombian Spanish version of the Juvenile Arthritis Multidimensional Assessment Report (JAMAR).

The Juvenile Arthritis Multidimensional Assessment Report (JAMAR) is a new parent/patient-reported outcome measure that enables a thorough assessment of the disease status in children with juvenile idiopathic arthritis (JIA). We report the results of the cross-cultural adaptation and validation of the parent and patient versions of the JAMAR in the Colombian Spanish language. The reading comprehension of the questionnaire was tested in ten JIA parents and patients. Each participating centre was asked to collect demographic, clinical data and the JAMAR in 100 consecutive JIA patients or all consecutive patients seen in a 6-month period and to administer the JAMAR to 100 healthy children and their parents. The statistical validation phase explored descriptive statistics and the psychometric issues of the JAMAR: the three Likert assumptions, floor/ceiling effects, internal consistency, Cronbach's alpha, interscale correlations, and construct validity (convergent and discriminant validity). A total of 22 JIA patients (9.1% systemic, 27.3% RF-negative polyarthritis, 36.4% enthesitis-related arthritis, 27.2% other categories) were enrolled in the paediatric centre of Bogota. All JAMAR components revealed good psychometric performances. In conclusion, the Colombian Spanish version of the JAMAR is a valid tool for the assessment of children with JIA and is suitable for use both in routine clinical practice and clinical research.

Introduction

The aim of the present study was to cross-culturally adapt and validate the Colombian Spanish parent, child/adult version of the Juvenile Arthritis Multidimensional Assessment Report (JAMAR) [1] in patients with juvenile idiopathic arthritis (JIA). The JAMAR assesses the most relevant parent/patient-reported outcomes in JIA, including overall well-being, functional status, health-related quality of life (HRQoL), pain, morning stiffness, disease activity/status/course, articular and extra-articular involvement, drug-related side effects/compliance and satisfaction with illness outcome.

This project was part of a larger multinational study conducted by the Paediatric Rheumatology International Trials Organisation (PRINTO) [2] aimed to evaluate the Epidemiology, Outcome and Treatment of Childhood Arthritis (EPOCA) in different geographic areas [3].

We report herein the results of the cross-cultural adaptation and validation of the parent and patient versions of the JAMAR in the Colombian Spanish language.

Materials and methods

The methodology employed has been described in detail in the introductory paper of the supplement [4]. In brief, it was a cross-sectional study of JIA children, classified according to the ILAR criteria [5, 6] and enrolled from October 2012 to August 2017. Children were recruited after Ethics Committee approval and consent from at least one parent.

The JAMAR

The JAMAR (1) includes the following 15 sections:

Assessment of physical function (PF) using 15 items in which the ability of the child to perform each task is scored as follows: 0 = without difficulty, 1 = with some difficulty, 2 = with much difficulty, 3 = unable to do and not applicable if it was not possible to answer the question or the patient was unable to perform the task due to their young age or to reasons other than JIA. The total PF score ranges from 0 to 45 and has three components: PF-lower limbs (PF-LL); PF-hand and wrist (PF-HW) and PF-upper segment (PF-US) each scoring from 0 to 15 [7]. Higher scores indicating higher degree of disability [8-10].

Rating of the intensity of the patient’s pain on a 21-numbered circle Visual Analogue Scale (VAS) [11].

Assessment of the presence of joint pain or swelling (present/absent for each joint).

Assessment of morning stiffness (present/absent).

Assessment of extra-articular symptoms (fever and rash) (present/absent).

Rating of the level of disease activity on a 21-circle VAS.

Rating of disease status at the time of the visit (categorical scale).

Rating of disease course from previous visit (categorical scale).

Checklist of the medications the patient is taking (list of choices).

Checklist of side effects of medications.

Report of difficulties with medication administration (list of items).

Report of school/university/work problems caused by the disease (list of items).

Assessment of HRQoL, through the physical health (PhH), and psychosocial health (PsH) subscales (five items each) and a total score. The four-point Likert response, referring to the prior month, are ‘never’ (score = 0), ‘sometimes’ (score = 1), ‘most of the time’ (score = 2) and ‘all the time’ (score = 3). A ‘not assessable’ column was included in the parent version of the questionnaire to designate questions that cannot be answered because of developmental immaturity. The total HRQoL score ranges from 0 to 30, with higher scores indicating worse HRQoL. A separate score for PhH and PsH (range 0–15) can be calculated [12-14].

Rating of the patient’s overall well-being on a 21-numbered circle VAS.

A question about satisfaction with the outcome of the illness (yes/no) [15].

The JAMAR is available in three versions, one for parent proxy-report (child’s age 2–18), one for child self-report, with the suggested age range of 7–18 years, and one for adults.

Cross-cultural adaptation and validation

The process of cross-cultural adaptation was conducted according to international guidelines with 2–3 forward and backward translations. In those countries for which the translation of JAMAR had been already cross-culturally adapted in a similar language (i.e., Spanish in South American countries), only the probe technique was performed. Reading comprehension and understanding of the translated questionnaires were tested in a probe sample of ten JIA parents and ten patients.

Each participating centre was asked to collect demographic, clinical data and the JAMAR in 100 consecutive JIA patients or all consecutive patients seen in a 6-month period and to administer the JAMAR to 100 healthy children and their parents.

The statistical validation phase explored the descriptive statistics and the psychometric issues [16]. In particular, we evaluated the following validity components: the first Likert assumption [mean and standard deviation (SD) equivalence]; the second Likert assumption or equal item–scale correlations (Pearson r: all items within a scale should contribute equally to the total score); third Likert assumption (item internal consistency or linearity for which each item of a scale should be linearly related to the total score that is 90% of the items should have Pearson r ≥ 0.4); floor/ceiling effects (frequency of items at lower and higher extremes of the scales, respectively); internal consistency, measured by the Cronbach’s alpha, interscale correlation (the correlation between two scales should be lower than their reliability coefficients, as measured by Cronbach’s alpha); test–retest reliability or intra-class correlation coefficient (reproducibility of the JAMAR repeated after 1 or 2 weeks); and construct validity in its two components: the convergent or external validity which examines the correlation of the JAMAR subscales with the six JIA core set variables, with the addition of the parent assessment of disease activity and pain by the Spearman’s correlation coefficients (r) [17] and the discriminant validity, which assesses whether the JAMAR discriminates between the different JIA categories and healthy children [18]. Test–retest reliability of the Colombian Spanish version of the JAMAR was not assessed.

Quantitative data were reported as medians with 1st and 3rd quartiles and categorical data as absolute frequencies and percentages.

The complete Colombian Spanish parent and patient versions of the JAMAR are available upon request to PRINTO.

Results

Cross-cultural adaptation

The Colombian Spanish JAMAR was fully cross-culturally adapted from the Castilian Spanish version.

All 123 lines of the parent version of the JAMAR were understood by at least 80% of the ten parents tested (median 100%; range 90–100%). All the 120 lines of the patient version of the JAMAR were understood by at least 80% of the children (median 100%; range 90–100%). Both versions of the JAMAR were unmodified after the probe technique.

Demographic and clinical characteristics of the subjects

A total of 22 JIA patients were enrolled at the paediatric rheumatology centre of Bogota.

In the 22 JIA subjects, the JIA categories were 9.1% with systemic arthritis, 13.6% with oligoarthritis, 27.3% with RF-negative polyarthritis, 13.6% with RF-positive polyarthritis and 36.4% with enthesitis-related arthritis. Notably, none of the enrolled JIA patients is affected with psoriatic arthritis or with undifferentiated arthritis (Table 1).

Table 1

Descriptive statistics (medians, 1st and 3rd quartiles or absolute frequencies and %) for the 22 JIA patients

	Systemic (N = 2)	Oligoarthritis (N = 3)	RF − polyarthritis (N = 6)	RF + Polyarthritis (N = 3)	Enthesitis-related arthritis (N = 8)	All JIA patients (N = 22)
Female	0 (0%)	2 (66.7%)	3 (50%)	3 (100%)	4 (50%)	12 (54.5%)
Age at visit	11 (6.1–16)	14.6 (4.3–16.1)	12.8 (11.2–14.5)	13.5 (11.5–17.9)	16.8 (14.8–17.3)	14.5 (11.5–16.7)
Age at onset	10.4 (5.8–15.1)	10.2 (2.8–11.3)	10.7 (9.4–11.5)	12.7 (7.7–15.8)	13.1 (10.3–14.5)	11.4 (9.4–14.3)
Disease duration	0.6 (0.3–0.9)	4.4 (1.5–4.8)	2.7 (1.9–4.6)	2.2 (0.8–3.9)	3.1 (1.8–4.9)	2.7 (1.4–4.4)
ESR	2 (2–2)	5 (4–17)	11 (4–23)	22 (6–28)	5 (2–8)	6 (4–16)
MD VAS (0–10 cm)	0 (0–0)	0 (0–0)	3 (0–4)	2 (0–4)	0 (0–2)	0 (0–2)
No. of swollen joints	0 (0–0)	0 (0–0)	1.5 (0–5)	0 (0–4)	0 (0–0)	0 (0–0)*
No. of joints with pain	0 (0–0)	0 (0–0)	3 (0–6)	0 (0–4)	1 (0–2)	0 (0–2)
No. of joints with LOM	0 (0–0)	0 (0–0)	6.5 (0–12)	1 (0–8)	0 (0–0)	0 (0–2)
No. of active joints	0 (0–0)	0 (0–0)	1.5 (0–5)	0 (0–4)	0 (0–0)	0 (0–0)*
Active systemic features	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)
ANA status	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)
Uveitis	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)
PF total score	0 (0–0)	0 (0–3)	5 (4–5)	4 (0–11)	0 (0–0)	0 (0–5)
Pain VAS	0 (0–0)	1 (0–2)	2 (0–5)	1 (1–1)	0 (0–0)	0 (0–2)
Disease activity VAS	0 (0–0)	0 (0–0)	1 (0–2)		0 (0–0)	0 (0–1)
Well-being VAS	0 (0–0)	0 (0–1)	0.5 (0–2)		1.5 (0–4)	0 (0–3)
HRQoL-PhH	49.5 (0–99)	1 (0–3)	1.5 (0–2)	1 (1–2)	1 (0–3)	1 (0–3)
HRQo-PsH	51 (3–99)	0 (0–1)	1 (0–3)	2 (1–8)	2 (0–3.5)	1.5 (0–3)
HRQoL total score	51.5 (4–99)	2 (0–3)	3 (0–4)	4 (2–9)	4 (0–6.5)	3 (0–6)
Pain/swell. in > 1 joint	0 (0%)	0 (0%)	5 (83.3%)	2 (66.7%)	4 (50%)	11 (50%)
Morning stiffness > 15 min	0 (0%)	0 (0%)	1 (16.7%)	0 (0%)	1 (12.5%)	2 (9.1%)
Subjective remission	1 (50%)	0 (0%)	4 (66.7%)	2 (66.7%)	4 (50%)	11 (50%)
In treatment	2 (100%)	1 (33.3%)	6 (100%)	3 (100%)	8 (100%)	20 (90.9%)
Reporting side effects	0 (0%)	0 (0%)	0 (0%)	1 (33.3%)	2 (25%)	3 (15%)
Taking medication regularly	2 (100%)	1 (100%)	5 (83.3%)	3 (100%)	8 (100%)	19 (95%)
With problems attending school	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)
Satisfied with disease outcome	1 (50%)	3 (100%)	2 (33.3%)	3 (100%)	6 (75%)	15 (68.2%)

Data related to the JAMAR refers to the 22 JIA patients for whom the questionnaire has been completed by the parents

JAMAR Juvenile Arthritis Multidimensional Assessment Report, ESR erythrocyte sedimentation rate, MD Medical Doctor, VAS Visual Analogue Scale (score 0–10; 0 = no activity; 10 = maximum activity), LOM limitation of motion, ANA Anti-nuclear antibodies, PF physical function (total score ranges from 0 to 45), HRQoL health-related quality of life (total score ranges from 0 to 30), PhH physical health (total score ranges from 0 to 15), PsH psychosocial health (total score ranges from 0 to 15)

p values refer to the comparison of the different JIA categories or to JIA versus healthy. *p < 0.05, **p < 0.001, #p < 0.0001

All the 22 subjects had the parent version of the JAMAR completed by a parent. The JAMAR was completed by 15/22 (68.2%) mothers and 7/22 (31.8%) fathers. The child version of the JAMAR was completed by 20/22 (90.9%) children age 10.7 or older.

Discriminant validity

The JAMAR results are presented in Table 1, including the scores [median (1st–3rd quartile)] obtained for the PF, the PhH, the PsH subscales and total score of the HRQoL scales. At the study units, it was not possible to recruit healthy children. Therefore, in this dataset, it was not possible, to assess the efficacy of the tools in discriminating between health subjects and affected children.

Psychometric issues

The main psychometric properties of both parent and child versions of the JAMAR are reported in Table 2. The following results section refers mainly to the parent’s version findings, unless otherwise specified.

Table 2

Main psychometric characteristics between the parent and child version of the JAMAR

	Parent (N = 22/22)	Child (N = 20/22)
Missing values (1st–3rd quartiles)	No missing values	No missing values
Response pattern	PF and HRQoL positively skewed	PF and HRQoL positively skewed
Floor effect, median
PF	86.4%	85.0%
HRQoL PhH	77.3%	60.0%
HRQoL PsH	63.6%	45.0%
Pain VAS	36.4%	20.0%
Disease activity VAS	50.0%	25.0%
Well-being VAS	36.4%	30.0%
Ceiling effect, median
PF	0.0%	0.0%
HRQoL-PhH	0.0%	0.0%
HRQoL-PsH	0.0%	5.0%
Pain VAS	0.0%	0.0%
Disease activity VAS	0.0%	0.0%
Well-being VAS	0.0%	0.0%
Items with equivalent item–scale correlation	100% for PF, 80% for HRQoL	87% for PF, 80% for HRQoL
Items with item–scale correlation ≥ 0.4	100% for PF, 80% for HRQoL	53% for PF,90% for HRQoL
Cronbach’s alpha
PF-LL	0.88	0.87
PF-HW	0.85	0.53
PF-US	0.90	0.48
HRQoL-PhH	0.51	0.81
HRQoL-PsH	0.77	0.63
Items with item–scale correlation lower than the Cronbach’s alpha	100% for PF, 80% for HRQoL	93% for PF, 100% for HRQoL
Spearman’s correlation with JIA core set variables, median
PF	0.4	0.2
HRQoL PhH	0.4	0.2
HRQoL PsH	0.2	0.1
Pain VAS	0.3	0.3
Disease activity VAS	− 0.1	-0.1
Well-being VAS	0.3	0.3

JAMAR Juvenile Arthritis Multidimensional Assessment Report, JIA juvenile idiopathic arthritis, VAS Visual Analogue Scale, PF physical function, HRQoL health-related quality of life, PhH physical health, PsH psychosocial health, PF-LL PF-lower limbs, PF-HW PF-hand and wrist, PF-US PF-upper segment

Descriptive statistics (first Likert assumption)

There were no missing results for all JAMAR items, since data were collected through a web-based system that did not allow to skip answers and input null values. The response pattern for both PF and HRQoL was positively skewed toward normal functional ability and normal HRQoL. A reduced number of response choices was used for all the different HRQoL items (with the exception of item 3), and for all the PF items.

The mean and SD of the items within a scale were roughly equivalent for the PF and for the HRQoL items (data not shown). The median number of items marked as not applicable was 0% (0–0%) for the PF and 1% (1–1%) for the HRQoL.

Floor and ceiling effect

The median floor effect was 86.4% (81.8–90.9%) for the PF items, 77.3% (63.6–81.8%) for the HRQoL PhH items, and 63.6% (59.1–63.6%) for the HRQoL PsH items. The median ceiling effect was 0% (0–0%) for the PF items, 0% (0–0%) for the HRQoL PhH items, and 0% (0–0%) for the HRQoL PsH items. The median floor effect was 36.4% for the pain VAS, 50.0% for the disease activity VAS and 36.4% for the well-being VAS. The median ceiling effect was 0% for the pain VAS, 0% for the disease activity VAS and 0% for the well-being VAS.

Equal items–scale correlations (second Likert assumption)

Pearson’s items–scale correlations corrected for overlap were roughly equivalent for items within a scale for 100% of the PF items, and 15 and for 80% of the HRQoL items, with the exception of items 1 and 2.

Items internal consistency (third Likert assumption)

Pearson’s items–scale correlations were ≥ 0.4 for 100% of items of the PF and 80% of items of the HRQoL (except for items 1 and 2).

Cronbach’s alpha internal consistency

Cronbach’s alpha was 0.88 for PF-LL, 0.85 for PF-HW, 0.90 for PF-US. Cronbach’s alpha was 0.51 for HRQoL-PhH and 0.77 for HRQoL-PsH.

Interscale correlation

The Pearson’s correlation of each item of the PF and the HRQoL with all items included in the remaining scales of the questionnaires was lower than the Cronbach’s alpha, with the exception of the HRQoL items 4 and 5 (data not shown).

Convergent validity

The Spearman’s correlation of the PF total score with the JIA core set of outcome variables ranged from 0.3 to 0.6 (median 0.4). The PF total score best correlation was observed with the parent’s assessment of pain (r = 0.61, p = 0.03). For the HRQoL, the median correlation of the PhH with the JIA core set of outcome variables ranged from − 0.05 to 0.7 (median 0.4), whereas for the PsH ranged from − 0.1 to 0.6 (median 0.2). The PhH showed the best correlation with the parent’s assessment of pain (r = 0.98, p < 0.001) and the PsH with the parent global assessment of well-being (r = 0.7, p = 0.007). The median correlations between the pain VAS, the well-being VAS, and the disease activity VAS and the physician-centred and laboratory measures were 0.3 (0.2–0.4), − 0.1 (− 0.1 to 0.2), 0.3 (0.1–0.3), respectively.

Discussion

In this study, the Colombian Spanish version of the JAMAR was cross-culturally adapted from the Castilian Spanish version. According to the results of the validation analysis, the Colombian Spanish parent and patient versions of the JAMAR possess satisfactory psychometric properties. However, because it was not possible to recruit healthy children, it was not possible to assess the efficacy of the tools in discriminating between health subjects and affected children.

Psychometric performances were good for all domains of the JAMAR with some exceptions: two HRQoL items (“Difficulty of taking care of him/herself” and “difficulty of taking a 15 min walk or walking up a flight of stairs”) showed a lower item’s internal consistency. However, the overall internal consistency was at least acceptable for all the domains, with the exception of the HRQoL-PhH Cronbach’s alpha that was poor.

In the external validity evaluation, the Spearman’s correlations of the PF and HRQoL scores with JIA core set parameters ranged from weak to moderate.

The results obtained for the child version of the JAMAR are similar, although slightly poorer, to those obtained for the parent version, which suggests that children are equally reliable proxy reporters of their disease and health status as their parents. Test–retest reliability was not assessed in this patient sample. The JAMAR is aimed to evaluate the side effects of medications and school attendance, which are other dimensions of daily life that were not previously considered by other HRQoL tools. This may provide useful information for intervention and follow-up in health care. In conclusion, the Colombian Spanish version of the JAMAR was found to have satisfactory psychometric properties and it is, thus, a reliable and valid tool for the multidimensional assessment of children with JIA.