Secondary outcomes
depression, anxiety
Changes in the level of depression and anxiety (K6 score).Since a normal distribution was confirmed for K6, a t-test was performed. The change in the K6 scores and results of the t-tests are shown in For the K6 scores, the results of two-way ANOVA between the timing and the intervention showed no interaction between the timing and the intervention. The main effect was confirmed only for timing, and the results of multiple comparisons (Bonferroni) showed that, atα = 0.01, pre- (T1) > post- (T2) and pre- (T1) > 1 month postpartum (T3). The results of the analysis in the intervention and control groups respectively showed that the degree of depression and anxiety in both the intervention and control groups differed significantly depending on the time of year (F(1.599, 47.977) = 10.521, p≺.001; F(2, 56) = 4.914, p = .011).Level of risk for postpartum depression (EPDS score) at 1 month postpartum.The mean EPDS scores were calculated at 1 month postpartum. Since the EPDS was non-normally distributed, a Mann-Whitney-U test was performed. The median was 4.5 for the intervention group and 4 for the control group, there was no significant difference between the two groups (p = .948) (see Change in self-efficacy for CBT response (self-efficacy assessment tool for CBT response).As the self-efficacy assessment tool for CBT response in the perinatal period was developed independently, we confirmed the internal consistency. The Cronbach’s α reliability coefficients for the 21-item scale were .874 before the intervention, .905 after the intervention, and .933 at 1 month postpartum. Spearman’s rank correlation coefficient was used to check whether the rating tables correlated with other scales (see 