Abstract: Objective: To develop and validate the factors related to physical activity questionnaire in pregnant women based on the Socioecological Model. Methods: The primary questionnaire was developed through literature review, semi-structured interviews, expert consultation and pilot survey. The convenience sampling was adopted to recruit 250 and 300 pregnant women from August to September, October to December, 2022, respectively, in a tertiary grade A hospital in Guangzhou. The items screening and the test of reliability and validity were carried out. Results: The questionnaire had 3 dimensions and 31 items. The positive coefficients of 2 rounds of letter consultations were all 100.0%, the authority coefficients were all 0.895, and the coordination coefficients were 0.117-0.496. Three common factors were extracted from the exploratory factor analysis, explaining 61.4% of the total variances. The confirmatory factor analysis showed that the factor structure model of the factors influencing physical activity of pregnant women was well fitted. The Cronbach's α coefficient was 0.932, the split reliability was 0.667, the test-retest reliability was 0.886, the content validity was 0.87-1.00, and the average content validity of the questionnaire was 0.99. Conclusion: The factors related to physical activity questionnaire in pregnant women based on the Socioecological Model has good reliability and validity. It is a reliable tool to evaluate the influencing factors of physical activity in pregnant women.

Key words: pregnant woman; physical activity; influencing factor; reliability; validity; Socioecological Model