Patient Assessment of Chronic Illness Care (PACIC) in Type 2 Diabetes: A Longitudinal Study.

The Patient Assessment of Chronic Illness Care (PACIC) was designed to measure care congruent with several elements of the chronic care model (CCM), including self-management support and delivery system design. However, support for the a priori 5-subscale structure of the PACIC in previous research has been conflicting. Thus, we aim to investigate psychometric characteristics of the PACIC including the content and stability of its construct over time. A population-based prospective cohort study of patients with type 2 diabetes was conducted in Queensland, Australia, from 2008 (N = 3,761) to 2010 (N = 3,040). Participants completed annually the 20-item PACIC as well as measures of providers' adherence to guideline-recommended self-management support activities. We used exploratory factor analysis to determine its factor structure and examined internal consistency as well as agreement between the PACIC at baseline with repeated measurements at follow-up after 1 and 2 years. We also determined a criterion-related validity using multinomial logistic regression to explore PACIC's association with providers' self-management support. A one-factor structure was deemed optimal according to our findings. High internal consistency and moderate agreement within the scales over time were observed. Higher PACIC scores predicted better providers' self-management support. In conclusion, the PACIC is a reliable, valid, and reproducible instrument for assessment of diabetes care, and we recommend its promotion and use as a single scale rather than subscales as originally proposed.