Development and Validation of the Self-care Agency Scale for Cancer Patients under Treatment

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Purpose/Objectives: This study was aimed at developing a reliable scale for assessing the self-care agency of cancer patients under treatment.<br>Design: A cross-sectional study was performed.<br>Methods: The study involved patients with cancer who were receiving care on an outpatient basis at 4 hospitals in the Kanto/Shinetsu Districts of Japan. The items of the Self-care Agency Scale for Cancer Patients under Treatment (SAC) were developed using a qualitative study. The main research variables that were analyzed were obtained from a temporary questionnaire, the Self-Care Agency Questionnaire for Patients with Chronic Illness, and the Functional Assessment of Cancer Therapy General. After an item analysis, the construct validity was assessed using a confirmatory factor analysis, followed by an analysis of the scale's reliability and criterion validity.<br>Findings: A convenience sample of 303 cancer patients was utilized. The fitness indices for the scale were as follows: Goodness of Fit Index (GFI)=0.911; Adjusted GFI=0.878. The Cronbach α coefficient was 0.900. The SAC was developed as a secondary factor model that included 3 factors and 15 items. The results of evaluation using this scale were significantly correlated with those of extermal standards.<br>Conclusions: The SAC's construct validity, criterion validity, and reliability were all confirmed.

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