Psychometric testing of the Thai version of Caregiver Contribution to Self-Care of Chronic Illness Inventory version 2.

Aim: To assess the psychometric properties of the Thai version of Caregiver Contribution to Self-Care of Chronic Illness Inventory version 2 (CC-SC-CII-v2) among primary caregivers of individuals with any single or multiple chronic illnesses.

Background: The instrument encompasses three scales that evaluate Caregiver Contribution to Self-Care (CC-SC) Maintenance, Monitoring and Management.

Methods: The English version CC-SC-CII-v2 was translated and adapted for Thai context, and a cross-sectional multicenter study involved 430 caregivers from 16 primary care centres in Thailand. Structural validity, internal consistency reliability and test-retest reliability were examined.

Results: The original two-factor CC-SC Maintenance scale required a re-specified model for good fit, while the CC-SC Monitoring and CC-SC Management scales fit well. The simultaneous model of three scales demonstrated satisfactory fit. The CC-SC Maintenance and CC-SC Management scales both had a composite reliability index of 0.85, with omega coefficients of 0.86 and 0.83, respectively. CC-SC Monitoring had an alpha coefficient of 0.89. The intraclass correlation coefficients ranging from 0.84 to 0.91, indicating good test-retest reliability.

Conclusion: The Thai CC-SC-CII-v2 is a valid and reliable instrument that can provide clinicians and investigators with an evaluation of the contributions of caregivers to the self-care of patients with chronic illnesses.