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Am J Perinatol 2024; 41(01): 017-030
DOI: 10.1055/a-1911-3326
Review Article

The Effects of Cannabis Use during Pregnancy on Low Birth Weight and Preterm Birth: A Systematic Review and Meta-analysis

Inês Baía
1   EPIUnit—Instituto de Saúde Pública, Universidade do Porto, Rua das Taipas, Porto, Portugal
2   Laboratório para a Investigação Integrativa e Translacional em Saúde Populacional (ITR), Universidade do Porto, Rua das Taipas, Porto, Portugal
,
Rosa M. S. M. Domingues 
3   Epidemiologist, Instituto Nacional de Infectologia Evandro Chagas/Fundação Oswaldo Cruz. Rio de Janeiro, Brazil
› Institutsangaben Funding This review was performed within the scope of the project “The Importance of the Right Weight at Birth” funded by the Calouste Gulbenkian Foundation.
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Abstract

Objective Our objective was to summarize the literature regarding the effects of cannabis use during pregnancy on low birth weight (LBW), preterm birth (PTB), and small for gestational age (SGA).

Study Design This is a systematic review and meta-analysis. A literature search was conducted in PubMed, Scopus, EBSCO, and Web of Science in May 2021 and updated in November 2021. Only studies that assessed the isolated use of cannabis during pregnancy, controlling for cigarette smoking, and other illicit drug use were included. Data were synthesized using a narrative summary and pooled adjusted estimates, and 95% confidence intervals (CIs) were calculated for each outcome. Data were analyzed using Stata 13.0 with METAN software package, using random effects. Statistical heterogeneity was assessed using Cochran's Q and Higgins I2 tests.

Results In total, 32 studies were included with data from approximately 5.5 million women with the LBW outcome and 23 million with the PTB and SGA outcomes. Pregnant women using cannabis are at increased risk for LBW (adjusted odds ratio [aOR] = 1.52; 95% CI = [1.18; 1.96]), PTB (aOR = 1.39; 95% CI = [1.28; 1.51]), and SGA (aOR = 1.47; 95% CI = [1.38; 1.58]). Studies that assessed the type of PTB and gestational age at birth indicate higher risks of spontaneous PTB and of early or very-early PTBs associated with cannabis use during pregnancy. The few studies that assessed the timing and frequency of consumption suggest a dose–response effect, with higher odds of negative outcomes among women who reported heavy use and with continued use during the second and third trimesters of gestation.

Conclusion There is an effect of cannabis irrespective of other illicit drugs and tobacco despite high heterogeneity and low quality of evidence. There is a need to discuss public policies regarding cannabis' regulation and how it influences its consumption. Future studies should focus on the effects of cannabis's type (medicinal or recreational), timing, and dosage during pregnancy on perinatal outcomes.

Key Points

  • Cannabis use during pregnancy is increasing.

  • Cannabis has an independent effect on PTB, LBW, and SGA.

  • Future studies should focus on the timing of exposure during pregnancy, mode of use, and dosage.

Keywords

cannabis - pregnancy - preterm birth - infant - low birth weight - infant - small for gestational age - systematic review - meta-analysis


Publikationsverlauf

Eingereicht: 15. März 2022

Angenommen: 21. Juli 2022

Accepted Manuscript online:
28. Juli 2022

Artikel online veröffentlicht:
16. September 2022

© 2022. Thieme. All rights reserved.

Thieme Medical Publishers, Inc.
333 Seventh Avenue, 18th Floor, New York, NY 10001, USA

 

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