Maternal Cannabis Use Disorder and Neonatal Health Outcomes: A Data Linkage Study.

OBJECTIVE

We tested for the potential associations between maternal antenatal cannabis use disorders (CUD) and neonatal health outcomes using large linked administrative data.

DESIGN

Population-based retrospective cohort study.

SETTING

The study was conducted in New South Wales, Australia.

POPULATION OR SAMPLE

A total of 215 879 singleton live births.

METHODS

Generalised linear models (GLMs) fitted using log-binomial regression to estimate risk ratios (RRs) with the corresponding 95% confidence intervals (95% CI). Additionally, we conducted a propensity score matching (PSM) analysis.

MAIN OUTCOME MEASURES

The outcomes include preterm births (PTB), low birth weight (LBW), small for gestational age (SGA), 5-min lower Apgar scores and admission to the neonatal intensive care unit (NICU).

RESULTS

In unmatched analyses, antenatal CUD was associated with increased risks for all adverse neonatal outcomes (adjusted risk ratio [RR] ranging from 1.47 [95% CI: 1.01, 2.14] for 5-min lower APGAR scores to 2.58 [95% CI 2.28, 2.91] for PTB). In PSM analyses, we observed slightly attenuated risks of PTB (RR = 1.98 [1.70, 2.31]), LBW (RR = 2.46 [2.13, 2.84]), SGA (RR = 1.84 [1.44, 2.35]) and admission to NICU (RR = 1.91 [1.49, 2.45]) after matching by covariates. However, we found no significant association between antenatal CUD and 5-min low APGAR scores (RR = 1.47 [0.94, 2.30]).

CONCLUSION

We found that maternal antenatal exposure to CUD is associated with a range of adverse neonatal outcomes. This study highlights that targeted interventions focusing on antenatal counselling are recommended to mitigate risks associated with maternal cannabis use.