IJE Advance Access originally published online on March 21, 2006
International Journal of Epidemiology 2006 35(3):673-679; doi:10.1093/ije/dyi320
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Changes in maternal marital status are associated with young adults' cannabis use: evidence from a 21-year follow-up of a birth cohort
School of Population Health, The University of Queensland, Brisbane, Australia
* Corresponding author. School of Population Health, The University of Queensland, 1st Floor, Public Health Building, Herston Road, Herston, QLD 4006, Australia. E-mail address: s4048335{at}student.uq.edu.au
Background Relatively little is known about why almost half of young adults in Australia have used cannabis. Because the upwards trend in use of cannabis has been coincident with an increase in marital breakdown, this study examines the relationship between marital status, marital changes, and the onset of cannabis use.
Methods Data are from the Mater-University Study of Pregnancy (MUSP), a 21-year prospective study in Brisbane, Australia. The present study is based on the 3008 mothers and their children for whom there were complete follow-up data at 21 years. Outcomes were self-reported cannabis use at age 21 and early onset (before age 15) cannabis use as judged from a retrospective report obtained at 21 years. Analyses were conducted using multivariate binomial and multinomial logistic regression.
Results Change in maternal marital status when the child was aged between 5 and 14 years was significantly associated with increased risk of cannabis use [odds ratio (OR) = 1.7; 95% confidence interval (95% CI) 1.4–2.0 for one or two marital changes and OR = 2.3; 95% CI 1.5–3.4 for three or more marital changes], after adjustment for a range of potential confounders.
Conclusion Experience of changes in maternal marital status in mid- to late-childhood is a significant predictor of subsequent and early use of cannabis by the child. This holds true even after allowing for certain possible causes and consequences of marital breakdown.
Keywords cannabis, early onset, marital status, marital change, young adults
Accepted 22 December 2005
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  J. Macleod and M. Hickman Commentary: Understanding pathways to cannabis use and from use to harm. Int. J. Epidemiol., June 1, 2006; 35(3): 680 - 682. [Full Text] [PDF]
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