Data analysis
Statistics were performed using IBM SPSS statistics ver.27. For comparison of the change in each outcome, the mean of the change was calculated, the normality of each was checked, and if normally distributed, a t-test was performed. The effect size (Cohen’s d) was calculated from the mean and standard deviation values. Alternatively, a Mann-Whitney U test was performed in the case of a non-normal distribution. Subgroup analysis by parity (primipara and multipara) was also used to compare changes in each outcome, the mean of the change was calculated, the normality of each was checked, and if normally distributed, a t-test was performed. The effect size (Cohen’s d) was calculated from the mean and standard deviation values. Participants’ satisfaction with the program was assessed for the mean CSQ-8J score using a t-test.