Association between repeat caesarean section and postpartum depression: an observational cohort study in Shanghai, China

OBJECTIVES: Although caesarean section (CS) has been reported as one of the potential risk factors for postpartum depression (PPD), there is uncertainty about the association between repeat CS and the risk of developing PPD. We sought to explore whether repeat CS will further increase the risk of PPD compared with primary CS. DESIGN: Observational cohort study. SETTING: A tertiary maternity hospital in Shanghai, China. PARTICIPANTS: 571 women, aged 20 years and older, full-term parturients with singleton scheduled for elective primary or repeat CS were enrolled between December 2020 and September 2021. PRIMARY AND SECONDARY OUTCOME MEASURES: An increased risk of PPD was defined as the total scores of the Edinburgh Postnatal Depression Scale ≥11. The primary outcome was the risk of PPD at 6 weeks postpartum. Secondary outcomes included the risk of postpartum depressive symptoms at 48 hours after CS, pain situation at 48 hours after CS and 6 weeks postpartum. RESULTS: Among the 571 women included in the final analyses, PPD at 6 weeks postpartum occurred in 41 women (24.0%) in the repeat CS group (n=171) versus 93 (23.3%) in the primary CS group (n=400). After adjusting for the confounders, repeat CS was not associated with higher odds of PPD at 6 weeks postpartum (adjusted relative risk (aRR), 1.04 (95% CIs 0.73 to 1.45); adjusted risk difference (aRD), 0.03 (95% CI -0.32 to 0.37), p=0.84). Compared with primary CS, women with repeat CS were more likely to report significant uterine contraction pain (NRS ≥4) at 48 hours after CS (aRR, 1.51 (95% CI 1.23 to 2.03); aRD, 0.41 (95% CI 0.12 to 0.71), p