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Risk of Motor Vehicle Collisions and Culpability among Older Drivers Using Cannabis: A Meta-Analysis.

Arun Chinna-Meyyappan1,2, Hui Jue Wang1,2, Kritleen K Bawa1,3

  • 1Neuropsychopharmacology Group, Sunnybrook Research Institute, 2075 Bayview Avenue, Toronto, ON M4N 3M5, Canada.

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|March 29, 2023
PubMed
Summary
This summary is machine-generated.

This study found no significant link between delta-9-tetrahydrocannabinol (THC) exposure and motor vehicle collisions (MVC) or culpability in older drivers. Cannabis use did not increase crash risk for adults over 50.

Keywords:
THCcannabisculpabilitydelta-9-tetrahydrocannabinoldrivingmotor vehicle collisionolder adultsroad traffic crashes

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Area of Science:

  • Gerontology
  • Cannabinoid pharmacology
  • Traffic safety research

Background:

  • Older adults are the fastest-growing driver demographic.
  • Limited research exists on cannabis effects on driving in this age group.
  • Delta-9-tetrahydrocannabinol (THC) is the primary psychoactive compound in cannabis.

Purpose of the Study:

  • To systematically review and perform a meta-analysis on THC exposure and its association with motor vehicle collisions (MVC) and culpability.
  • To evaluate driving risks among adults aged 50 and older following THC exposure.

Main Methods:

  • Systematic review and meta-analysis of seven cross-sectional studies.
  • Screening of 7022 studies from multiple databases (MEDLINE, EMBASE, CENTRAL, PsycINFO).
  • Odds Ratios (OR) calculated using Mantel-Haenszel method; heterogeneity assessed with I²; study quality evaluated using NHLBI tool.

Main Results:

  • No significant difference in MVC risk between THC-positive and THC-negative older drivers (OR, 1.15 [0.40, 3.31]).
  • THC exposure was not significantly associated with increased culpability for MVCs in adults over 50 (OR, 1.24 [0.95, 1.61]).
  • Funnel plot inspection indicated no significant publication bias.

Conclusions:

  • THC exposure in older adults (50+) was not found to be associated with an increased risk of motor vehicle collisions.
  • Cannabis use does not appear to increase the likelihood of being culpable for MVCs in this demographic.
  • Further research may be warranted, but current evidence suggests no elevated risk.