Night work and postpartum depression: a national register-based cohort study

Source avec lien : Scandinavian Journal of Work, Environment & Health, Prépublication, 2019. 10.5271/sjweh.3831

Cette étude de cohorte à l’échelle nationale, basée sur un registre des travailleurs de tous les hôpitaux publics danois, visait à étudier l’association entre le travail de nuit pendant la grossesse et le risque de dépression post-partum grave (DPP). Dans l’ensemble, les résultats n’appuient pas le travail de nuit pendant la grossesse comme facteur de risque de DPP grave chez le personnel hospitalier. Cependant, le risque de DPP a doublé chez les femmes qui ont cessé de travailler de nuit après le premier trimestre de grossesse.

Objective We aimed to investigate the association of night work during pregnancy with the risk of severe postpartum depression (PPD). Methods We performed a nationwide register-based cohort study of workers in all Danish public hospitals. Daily information on working hours was retrieved from the Danish Working Hour Database from January 2007 to December 2015. Pregnancies, covariates and outcome were identified from national registries for births and hospital contacts. We performed logistic regression of the risk of severe PPD in relation to the number and duration of night shifts, spells of consecutive night shifts, and short shift intervals during the first 32 pregnancy weeks. Analyses were adjusted for age, body mass index, socioeconomic status, parity, sickness absence three months prior to pregnancy, and prior diagnosis of severe depression. Results The study cohort comprised 25 009 singleton pregnancies from 19 382 workers. The majority were nurses or physicians. Overall, we did not observe an increased risk of PPD for any of the dimensions of night work analyzed. We found, however, an increased risk of PPD (adjusted odds ratio 2.08, 95% confidence interval 1.09–4.00) among women who stopped working night shifts after the first pregnancy trimester (N=3094). Conclusion Overall, our results do not support night work during pregnancy as a risk factor for severe PPD among hospital employees. However, we observed a 2-fold increased risk of PPD among women who stopped working night shifts after the first pregnancy trimester. This may reflect the influence of the healthy worker survivor effect and warrants further attention.

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