Development and validation of the Chinese version of the adult sedentary behavior reduction intention questionnaire based on the theory of planned behavior

Abstract

Abstract Prom The Chinese version of the Adult Sedentary Behavior Reduction Intention Questionnaire, a 16-item self-reported tool based on the Theory of Planned Behavior (TPB), was developed to assess adults’ intentions to reduce sedentary behavior. Measurement property Internal consistency is used to measure the reliability of the questionnaire, while content and structural validity are studied to assess its validity. Design A mixed-methods exploratory sequential design with two phases. Sample Adults aged over 18 years diagnosed with coronary heart disease, with a total daily sedentary time exceeding 6 h, normal cognitive function, and willingness to participate in the study were included. Methods The study was conducted in two phases. In Phase 1, an initial item pool was developed through a literature review and refined using two rounds of Delphi expert consultation. Expert positivity, authority levels (Cr), coefficients of variation (CV), and Kendall’s W coefficient were calculated to assess representativeness, credibility, and consensus. A pilot study evaluated face validity and finalized the scale. In Phase 2, a cross-sectional study involving 316 participants was conducted to assess psychometric properties. Reliability was evaluated using Cronbach’s α and split-half reliability, while content validity was assessed using the content validity index (I-CVI). Construct validity was examined through confirmatory factor analysis (CFA). Results Phase 1 resulted in a preliminary questionnaire with four dimensions and 16 items. Sixteen experts completed two rounds of Delphi consultation, with high response rates (85% and 94.1%) and authority levels (Cr = 0.88 and 0.91). Consensus was strong (CV = 0.05 ~ 0.23; Kendall’s W = 0.338 and 0.382, p < 0.001). Phase 2 validation showed a Cronbach’s α of 0.967, with individual dimensions ranging from 0.911 to 0.950. I-CVI ranged from 0.813 to 1. The adjusted model indices met the fitting criteria. Conclusions The developed questionnaire is a reliable and valid tool for assessing Chinese adults’ intentions to reduce sedentary behavior. Grounded in TPB, it provides a theoretical foundation for future intervention studies aimed at addressing sedentary lifestyles.

Keywords

• Theory of planned behavior
• Sedentary behavior
• Instrument development
• Psychometric validation