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Trends and correlates of cannabis use in pregnancy: a population-based study in Ontario, Canada from 2012 to 2017

  • Corsi, Daniel J.1, 2, 3
  • Hsu, Helen4
  • Weiss, Deborah2, 5
  • Fell, Deshayne B.2, 3
  • Walker, Mark1, 6
  • 1 Centre for Practice Changing Research, OMNI Research Group, Ottawa Hospital Research Institute, 501 Smyth Road, Ottawa, ON, K1H 8L6, Canada , Ottawa (Canada)
  • 2 University of Ottawa, School of Epidemiology and Public Health, Ottawa, Canada , Ottawa (Canada)
  • 3 Children’s Hospital of Eastern Ontario Research Institute, Ottawa, Canada , Ottawa (Canada)
  • 4 University of Ottawa, Department of Family Medicine, Ottawa, Canada , Ottawa (Canada)
  • 5 Children’s Hospital of Eastern Ontario, BORN Ontario, Ottawa, Canada , Ottawa (Canada)
  • 6 University of Ottawa, Department of Obstetrics and Gynecology, Ottawa, Canada , Ottawa (Canada)
Published Article
Canadian Journal of Public Health
Springer International Publishing
Publication Date
Nov 01, 2018
DOI: 10.17269/s41997-018-0148-0
Springer Nature


ObjectiveForthcoming legislative changes will legalize and make cannabis widely available in Canada. We conducted an analysis of Ontario’s birth registry to determine recent trends and correlates of cannabis use in pregnancy.MethodsWe conducted a population-based retrospective cohort study assembled from the Better Outcomes Registry & Network (BORN) Ontario database, covering live births and stillbirths in Ontario between April 2012 and December 2017. Trends in self-reported cannabis use in pregnancy were analyzed according to maternal age and area-level socio-economic status (SES) using log binomial regression analysis.ResultsA total of 10,731 women reported cannabis use in pregnancy. Prevalence increased from 1.2% in 2012 to 1.8% in 2017 (p-trend, < 0.001), equivalent to a relative increase of 61% (relative risk [RR] 1.61, 95% confidence interval [CI] 1.51 to 1.72). The crude prevalence of cannabis use in pregnancy among women aged 15 to 24 years and in the lowest two area-level income quintiles was 6.7%, compared to 0.3% among women aged 35 years and over in the highest three income quintiles (RR 24.59, 95% CI 21.98 to 27.52). A majority (52.0%) of cannabis users were aged 15–24 years and 54.7% of users were in the lowest two income quintiles.ConclusionCannabis use in pregnancy has increased since 2012 in Ontario and was reported in about 2% of pregnancies in 2017. Increases were predominately among women of younger ages and those of lower SES, and these groups account for half of users. Promoting cannabis cessation in pregnancy could lead to improved perinatal and later childhood outcomes and reduce health inequalities.

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