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The association between caesarean and postnatal psychological distress: Effect modification by mental health history
Author(s) -
Henderson Ian,
Quenby Siobhan
Publication year - 2021
Publication title -
paediatric and perinatal epidemiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.667
H-Index - 88
eISSN - 1365-3016
pISSN - 0269-5022
DOI - 10.1111/ppe.12791
Subject(s) - medicine , relative risk , anxiety , depression (economics) , obstetrics , confidence interval , history of depression , cohort study , psychiatry , macroeconomics , economics
Background The association between mode of delivery and postnatal depression is uncertain. Mental health history may modify the association. Objectives The objective of this study was to determine whether the association between caesarean and postnatal psychological distress (PPD) differs according to long‐standing depression/anxiety. Methods Analysis of the UK‐based Millennium Cohort Study of women who gave birth 2000–2002 was carried out. The outcomes were PPD at 9 months by Rutter Malaise Inventory and actively treated physician‐diagnosed depression/severe anxiety at 3 years. The exposure was mode of delivery. Adjusted relative risks were estimated using Poisson regression. Effect modification according to long‐standing depression/anxiety was investigated multiplicatively and additively. Results We included 15,936 women, of whom 2346 (13.4%, weighted) reported PPD. Women with long‐standing depression/anxiety were at 34% lower risk of PPD following elective caesarean, compared with vaginal birth: relative risk (RR) 4.36 (95% confidence interval [CI] 3.76, 5.05), RR 3.25 (95% CI 2.23, 4.75) and RR 4.92 (95% CI 3.67, 6.59) for vaginal, elective and emergency caesarean births, respectively, with relative excess risk due to interaction (RERI) −1.28 (95% CI −2.73, 0.16), ratio of RRs 0.66 (95% CI 0.42, 1.05). Women with long‐standing depression/anxiety were at greatest risk of later treatment following emergency caesarean, with RR 4.95 (95% CI 3.86, 6.34), RR 4.09 (95% CI 2.51, 6.65) and RR 6.74 (95% CI 4.87, 9.32), for vaginal, elective and emergency caesarean births, respectively; RERI 1.79 (95% CI −0.13, 3.71), ratio of RRs 1.36 (95% CI 0.94, 1.99); all RRs with reference to vaginal birth in the absence of long‐standing depression/anxiety. There was no evidence of a similar association between emergency caesarean and PPD nor elective caesarean and later treatment. Conclusions Women with long‐standing depression or anxiety who had elective caesarean had a lower risk of postnatal distress. When this group had emergency caesarean, there was greater risk of actively treated depression/anxiety at 3 years. These associations were not observed in women without long‐standing depression/anxiety.