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Psychometric Evaluation of a Korean Version of the Cancer Survivors' Self-efficacy Scale

Kim, Soo Hyun, RN, PhD, OCN; Lee, Bo Gyeong, RN, PhD; Lee, Ji Yeon, RN, MS; Kim, Sei Joong, MD, PhD; Hur, Min Hee, MD, PhD; Lee, Moon Hee, MD, PhD; Han, Mi Sook, RN

doi: 10.1097/NCC.0000000000000691
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Background Self-efficacy has become the target outcome of many self-management interventions for cancer survivors. However, no measurement is available that can be used to measure cancer-specific self-efficacy in Korea.

Objective The aim of this study was to cross-culturally evaluate the reliability and validity of a Korean version of the Cancer Survivors' Self-Efficacy Scale (CSSES-K).

Methods We translated the original version of the CSSES (11 items) and created a Korean version. We then conducted a validation study with 204 cancer survivors who had completed their primary treatment. We conducted psychometric evaluation using item analysis, factorial construct validity (exploratory factor analysis and confirmative factor analysis), hypothesis testing construct validity, and internal consistency reliability (Cronbach's α).

Results Exploratory factor analysis revealed 2 subscales for which model fitting was appropriate—“self-efficacy for managing health problems” (5 items) and “self-efficacy for seeking help and support” (5 items). Hypothesis testing construct validity was confirmed showing significant moderate correlations between the CSSES-K and general self-efficacy (r = 0.511, P < .001), anxiety (r = −0.596, P < .001), depression (r = −0.554, P < .001), and health-related quality of life (r = 0.586, P < .001). The internal consistency of the CSSES-K of total scale and subscales was high (Cronbach's α = .86-.92).

Conclusions The results supported that the CSSES-K was valid and reliable in measuring self-efficacy among Korean cancer survivors after cancer treatment.

Implications for Practice Our findings suggest that the CSSES-K can be effectively used for measuring self-efficacy in Korean cancer survivors.

Author affiliations: Department of Nursing, Inha University, Incheon (Dr SH Kim and Mrs Han); College of Nursing, The Research Institute of Nursing Science, Catholic University of Daegu (Dr BG Lee); College of Nursing, Yonsei University, Seoul (Mrs JY Lee); Departments of Surgery (Drs SJ Kim and Hur) and Hemato-Oncology (Dr MH Lee), and Breast Thyroid Surgery Center (Mrs Han), Inha University Hospital, Incheon; and School of Medicine, Inha University, Incheon, South Korea (Drs SJ Kim, Hur, and MH Lee).

This study was supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education (grant number 2016R1D1A1B04932171).

The authors have no conflicts of interest to disclose.

Correspondence: Soo Hyun Kim, RN, PhD, Department of Nursing, Inha University 100 Inharo, Nam-gu, Incheon 22212, South Korea (soohyun@inha.ac.kr).

Accepted for publication November 4, 2018.

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