：Objective To confirm the structure and reliability of knowledge, attitude and practice(KAP)scale and provide a tool for evaluating the level of knowledge, attitude and practice in young and middle-aged hypertensive patients. Methods 〓The self-made KAP scale was used in this study, and the 400 study cases were selected from 5 communities in Hengyang by purposive sampling. Structural equation model was established by Mplus7.4 version including latent variables and observational variables. The parameter estimation of the model adopted the robust weighted least squares estimator with adjustments for the mean and variance(WLSMV), and the model fit indexes were χ2, freedom degree(df), approximate error mean square root(RMSEA), weighted error mean square root(WRMR), comparison fitting index(CFI), Tucker-Lewis index(TLI), etc. The reliability of the scale was estimated using the Omega coefficients based on McDonald's model. Results 〓The two models showed that except RMSEA(model 1 was 0.116 and model 2 was 0.103), the other model fit indexes reached the recommended standards(model fit index of model 1 and model 2 were WRMR: 0.915 and 0.808, CFI: 0.913 and 0.924, TLI: 0.902 and 0.917, respectively), and model 2 were better than that of model 1. Knowledge has a direct impact on attitude and behavior, with regression coefficients were 0.730 and 0.752 respectively. Attitude has a direct impact on behavior, with regression coefficient was 0.665. The reliability of the total scale was 0.817, and the reliability of the sub-dimensions were 0.808, 0.813 and 0.816, respectively. Conclusion 〓The three-factor structure was conformed to match with the KAP theory, and the KAP scale has a good reliability in the young and middle-aged hypertensive patients, which can be used as a tool to evaluate the current situation of knowledge, attitude and practice in young and middle-aged hypertensive patients.
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