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Can J Public Health. 2019 Feb;110(1):76-84. doi: 10.17269/s41997-018-0148-0. Epub 2018 Nov 1.

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

Corsi DJ1,2,3, Hsu H4, Weiss D5,6, Fell DB5,7, Walker M8,9.

Author information

1
OMNI Research Group, Ottawa Hospital Research Institute, Centre for Practice Changing Research, 501 Smyth Road, Box 241, Ottawa, ON, K1H 8L6, Canada. dcorsi@ohri.ca.
2
School of Epidemiology and Public Health, University of Ottawa, Ottawa, Canada. dcorsi@ohri.ca.
3
Children's Hospital of Eastern Ontario Research Institute, Ottawa, Canada. dcorsi@ohri.ca.
4
Department of Family Medicine, University of Ottawa, Ottawa, Canada.
5
School of Epidemiology and Public Health, University of Ottawa, Ottawa, Canada.
6
BORN Ontario, Children's Hospital of Eastern Ontario, Ottawa, Canada.
7
Children's Hospital of Eastern Ontario Research Institute, Ottawa, Canada.
8
OMNI Research Group, Ottawa Hospital Research Institute, Centre for Practice Changing Research, 501 Smyth Road, Box 241, Ottawa, ON, K1H 8L6, Canada.
9
Department of Obstetrics and Gynecology, University of Ottawa, Ottawa, Canada.

Abstract

OBJECTIVE:

Forthcoming 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.

METHODS:

We 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.

RESULTS:

A 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.

CONCLUSION:

Cannabis 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.

KEYWORDS:

Canada; Cannabis; Epidemiology; Marijuana; Pregnancy; Time trends; Women

PMID:
30387034
DOI:
10.17269/s41997-018-0148-0

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