Reliability and validity of Type 2 Diabetes and Health Promotion Scale among type 2 diabetes patients in China

Objective To assess the reliability and the validity of the Type 2 Diabetes and Health Promotion Scale(T2DHPS) among type 2 diabetes patients in China and to provide a scientific basis for the application of the scale in mainland China.Methods Fixed-point consecutive sampling was used to select 180 type 2 diabetes patients at two affiliated hospitals of Changzhi Medical College in Shanxi province and a face-to-face survey was conducted among the patients from May 2015 to April 2016 with T2DHPS.Cronbach's coefficient and split-half reliability were calculated to evaluate the reliability of T2DHPS and factor analysis,discriminant and convergent analysis were performed to measure the validity of the scale.Results The overall Cronbach's α coefficient of T2DHPS was 0.943 and the split-half (odd-even) reliability was 0.94.The domain Cronbach's α coefficients and split-half reliability were 0.931 and 0.897 for physical activity,0.832 and 0.741 for risk reduction,0.838 and 0.802 for stress management,0.887 and 0.669 for enjoying life,and 0.819 and 0.707 for health responsibility,respectively,suggesting a good reliability of the scale.The simplified version of the T2DHPS supported a presupposed six-factor structure,explaining 70.266% of the total variance revealed by exploratory factor analysis.The average domain scores of T2DHPS were 16.0±7.6 for physical activity,17.5±6.6 for risk reduction,14.7±5.4 for stress management,11.2±3.6 for enjoying life,8.6±3.8 for health responsibility,and 9.7±3.5 for healthy diet,respectively.The T2DHPS's convergent validity was significantly higher than its discriminant validity,demonstrating a good validity of the scale.Conclusion The reliability and validity of the simplified T2DHPS are in line with the requirements of psychometric test.The scale is suitable for measuring the efficiency of health promotion among type 2 diabetes patients in China.