ABSTRACT Aim The psychometric properties of the 10‐item Self‐Care Self‐Efficacy scale have not yet been established in the Korean language. This study aimed to evaluate its validity and reliability among Korean patients with heart failure (HF). Methods A total of 159 patients with HF participated (mean age: 65.40 ± 9.62 years; 60.1% male). Construct validity was assessed using confirmatory factor analysis. Criterion validity was examined by assessing the correlation of self‐efficacy with HF symptom status and physical function and by comparing self‐efficacy levels across the New York Heart Association classes. Reliability was evaluated using Cronbach's alpha, McDonald's omega and factor determinacy. Results Confirmatory factor analysis fit indices were as follows: comparative fit index = 0.977, Tucker–Lewis index = 0.966, standardised root mean square residual = 0.041 and root mean square error of approximation = 0.065 (90% CI = 0.038–0.090). Criterion validity was supported by significant correlations between self‐efficacy and symptom status ( r = −0.331, p < 0.001) and physical function ( r = 0.299, p < 0.001). Self‐efficacy scores were significantly higher in patients with lower New York Heart Association class (I/II) than higher class (III or IV) ( F = 4.68, p = 0.011). Reliability estimates were robust: Cronbach's α = 0.913, McDonald's omega = 0.902 and factor determinacy = 0.941. Conclusion This study supports the validity and reliability of the Self‐Care Self‐Efficacy scale in Korean for assessing self‐care self‐efficacy among patients with HF. Clinicians should consider evaluating and enhancing patients' self‐care self‐efficacy to effectively manage HF symptoms, especially considering functional severity.
Kim et al. (Sun,) studied this question.