Validity and Reliability of Revised Version of the Self-Care Behaviors Scale-Korean (SCBS-K19) for Rheumatoid Arthritis Patients

Abstract

Purpose: This study aims to evaluate the Korean revised version of the Self-Care Behaviors Scale ’ s (SCBS-K19) validity and reliability. Methods: The data of 203 rheumatoid arthritis patients at a university hospital in D metropolitan city in South Korea were collected from July to August 2020, using a convivence sampling method. The SCBS-K19 was analyzed utilizing SPSS 26.0 and AMOS 23.0 programs. The SCBS-K19 ’ s content validity, structure validity, item-convergent/discriminant validity, convergent validity, and internal consistency and reliability were evaluated. Results: Among the items in original version, the items with a ceiling or floor effect of 30% or more were deleted, thus, resulting in a revised version with five sub-areas and 19 questions. The confirmatory factor analysis ’ results showed adequate model fit indices (c2/df=2.29, GFI=.85, RMR=.06, RMSEA=.08, CFI=.91, TLI=.89, IFI=.91). The items ’ convergence and discrimination validity were verified using the extracted mean variance (.52~.66) and composition reliability (.80~.90). The convergent validity was satisfactory as shown by its correlation with the Self-as Carer Inventory (SCI) (r=.60, p < .001). The Cronbach ’ s ⍺ for the overall scale was .88, and that of five subscales ranged from .77 to .90. Conclusion: The SCBS-K19 is a valid and reliable instrument. Therefore it is expected that this tool can be used to measure the level of self-care in Korean patients with rheumatoid arthritis.