Chronic illness adjustment scale (CIAS): Development and validation.

Objectives: The objectives of this study were to (i) develop a self-report instrument to measure adjustment to chronic illness, (ii) evaluate its core structure and (iii) study various psychometric properties in the development of this instrument.

Method: The entire process of developing and validating the instrument is conducted in different phases: item writing and content validation; exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) to extract dimensions of the instrument; reliability and validity testing. A total of 1095 participants were included in the study.