Development of the Chinese-version of the exercise self-regulatory efficacy scale for patients with chronic obstructive pulmonary disease

Abstract Background A valid and reliable instrument for assessing exercise self-regulatory efficacy (Ex-SRE) is lacking in Taiwan. Objective To develop and validate a Chinese-version of the Ex-SRE scale ( Ex-SRES-Chinese ). Methods Published guidelines were followed for cross-cultural adaptation of Ex-SRES-Chinese . Psychometric testing was conducted in 76 subjects with chronic obstructive pulmonary diseases (COPD). Results Ex-SRES-Chinese achieved clarity, culture appropriateness, and functional equivalence for measuring Ex-SRE. The scale-level content validity index of the Ex-SRES-Chinese was 0.99. The internal consistency reliability (Cronbach's α) was 0.925. Factor analysis identified a single factor with a high eigenvalue of 7.6 accounting for 47.5% of the total variance. The construct validity of Ex-SRES-Chinese was supported by higher Ex-SRE in subjects who exercise regularly in the past than those who did not ( p  = 0.033). In addition, Ex-SRE was positively associated with weekly exercise time ( r =  0.58; p   0.0001). Conclusions Ex-SRES-Chinese is a useful cross-culturally adapted instrument with good psychometric properties for measuring Ex-SRE in COPD patients in Taiwan.