Risk of preterm birth, small for gestational age at birth, and stillbirth after covid-19 vaccination during pregnancy: population based retrospective cohort study.

ABSTRACT:

Objective

To assess the risk of preterm birth, small for gestational age at birth, and stillbirth after covid-19 vaccination during pregnancy.

Design

Population based retrospective cohort study.

Setting

Ontario, Canada, 1 May to 31 December 2021.

Participants

All liveborn and stillborn infants from pregnancies conceived at least 42 weeks before the end of the study period and with gestational age ≥20 weeks or birth weight ≥500 g.

Main outcome measures

Using Cox regression, hazard ratios and 95% confidence intervals were estimated for preterm birth before 37 weeks (overall and spontaneous preterm birth), very preterm birth (<32 weeks), small for gestational age at birth (<10th centile), and stillbirth. Vaccination against covid-19 was treated as a time va

SUBMITTER: Fell DB 

PROVIDER: S-EPMC9382031 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature