Postpartum depression among newly delivered mothers based on postnatal newborn care

Background: Postpartum depression (PPD) is a serious public health problem affecting ~ 17% of women globally, with higher rates recorded in southern Africa – ~40%. Admission to the neonatal intensive care unit (NICU) is a risk factor for PPD. Our primary hypothesis was that infant care in the Kangaroo Mother Care Ward (KMC) after NICU stay would be associated with a lower prevalence of maternal PPD. Methods: We conducted a cross-sectional study among newly delivered mothers at the University Teaching Hospitals in Lusaka, Zambia, between June 2022 – May 2023. Mothers of infants discharged home from the Newborn Nursery (if NICU admission was not required), NICU (unwell newborns requiring NICU care), or NICU/KMC Ward (unwell newborns requiring NICU care followed by further monitoring at the KMC ward) were screened for PPD using the Edinburgh Postnatal Depression Scale (EPDS) screening tool at 6–8 weeks postnatally. Mothers who scored 11 + were categorized as having PPD. Poisson models were used to estimate prevalence ratios (PR) for screening positive for PPD. The primary outcome was PPD following KMC versus NICU discharge. Results: We screened 1056 newly delivered women for PPD pooled from mother-infant pairs discharged from the newborn nursery (n = 352), NICU/KMC (n = 352), or NICU (n = 352). Overall, mothers’ average age was 27.5 years, 61.1% had secondary education, 59.2% were unemployed, and 11.2% were HIV-positive. The proportion of women who screened positive for maternal PPD among all three arms was 20.5% with anxiety reaching 50.5%. Mothers whose newborns were admitted to the NICU/KMC arm had a lower proportion of women who screened positive for PPD (21.3%) compared to those directly discharged home from the NICU (29.0%) (p < 0.001). The adjusted prevalence of PPD positivity rate was significantly higher in the NICU and KMC arms compared to the Newborn Nursery arm, RR = 2.44 (95% CI 1.61, 3.73) and RR = 1.94 (95% CI 1.04, 3.61), respectively. However, in the adjusted analysis, there was no significant difference in the PPD positivity rate between the KMC and the NICU arms. Conclusion: Admission to the KMC ward following the NICU was not associated with a lower PPD prevalence among newly delivered mothers compared to direct NICU discharge. Clinical trial number: Not applicable.