Validity and Reliability of the Caregiver Contribution to Self-Care of Chronic Illness Inventory in Patients With Inflammatory Bowel Disease

Aim: To assess the validity and reliability of the Caregiver Contribution to Self-Care of Chronic Illness Inventory (CC-SC-CII) among caregivers of patients with Inflammatory Bowel Disease (IBD). Design: A cross-sectional psychometric study. Methods: This study is part of the multicenter longitudinal study project conducted in nine IBD centers. Factorial validity was evaluated through confirmatory factor analysis (CFA), and construct validity was examined through correlation with caregiver self-efficacy. Internal consistency was assessed with omega coefficients and composite reliability. Test–retest reliability between baseline and 6 months was estimated using the Intraclass Correlation Coefficient (ICC). Results: A total of 275 informal caregivers of patients with IBD completed the CC-SC-CII. CFA supported the original three-scale structure of the CC-SC-CII (maintenance, monitoring, management), with acceptable model fit after minor item-level adjustments. Internal consistency ranged from 0.71 to 0.94 across subscales. ICCs ranged from 0.749 to 0.896, indicating good to excellent test–retest reliability. All item-total correlations exceeded 0.30. Positive correlations with caregiver self-efficacy scores supported construct validity. Conclusion: The CC-SC-CII is a valid and reliable instrument for assessing caregiver contribution to self-care in the IBD population. Trial Registration: ClinicalTrials.gov identifier: NCT06015789.