Reliability and validity of the Japanese version of the Pregnancy and Weight Gain Attitude Scale

This study aimed to develop the Japanese version of the Pregnancy and Weight Gain Attitude Scale (J-PWGAS) as a measurement of body image regarding body weight and shape during pregnancy. This cross-sectional study was conducted at a perinatal medical center in Osaka, Japan, between March and November 2020. We recruited pregnant women in their second or third trimester, who were 20 years old or older and without pregnancy complications. This study evaluated the criterion validity, construct validity, internal consistency, and test-retest reliability. Of the participants, 218 and 102 women participated in the validation and test-retest reliability studies, respectively. An exploratory factor analysis revealed a 17-item, five-factor structure. The J-PWGAS indicated acceptable criterion validity, internal consistency, and test-retest reliability. The J-PWGAS can measure attitudes toward gestational weight gain in Japanese pregnant women and would be useful in examining the association of body image with weight gain and psychological status during pregnancy.