Supplementary file 1_The revised version of the Physical Self-Description Questionnaire-Short for Chinese middle school students.docx

ObjectiveChinese version of the Physical Self-Description Questionnaire-Short (PSDQ-S) was revised, and its reliability, validity, and gender invariance were tested among Chinese middle school students.
MethodsA convenience sampling method was used to select 1,632 middle school students in grades 7-12 (12-18 years old) in Shanghai for the PSDQ-S questionnaire survey, and SPSS 24.0 and Mplus 8.3 software were used for data analysis.
ResultsEight factors were extracted by exploratory factor analysis with a cumulative variance explanation rate was 79.45%. Confirmatory factor analysis supports the hypothesis of an 8-factor model (χ2/df = 1.846, CFI = 0.939, TLI = 0.929, SRMR = 0.050, RMSEA = 0.061), and the 8 dimensions are Endurance, Flexibility and Coordination, Body Fat, Appearance, Global Physical, Health, Sport, and Regular Exercise. The average variance extracted from each factor of the Chinese version of the PSDQ-S convergent validity index was greater than 0.50, and the composite reliability was greater than 0.60. The gender invariance hypothesis was established.
ConclusionThe revised Chinese version of the PSDQ-S has good validity, reliability, and gender equivalence, encompassing eight sub-dimensions that can assess the independent yet interrelated latent constructs within the physical self-concept of Chinese middle school students.