Early cannabis initiation and educational attainment: is the association causal? Data from the French TEMPO study

International Journal of Epidemiology
Maria MelchiorMarie Jauffret-Roustide

Abstract

Adolescent cannabis use has been reported to predict later educational attainment; however, results of past studies may be confounded by inappropriate control for factors that make some youths more likely to use cannabis precociously than others. We aimed to test the possibility of a causal relationship between early cannabis initiation and later academic achievement. Analyses are based on data collected among TEMPO cohort study participants (France, 2009, n = 1103, 22-35 years). Participants were previously assessed in childhood (1991) and adolescence (1999); additionally, their parents had taken part in a longitudinal epidemiological cohort study (GAZEL). Early cannabis initiation was defined as use at age 16 or earlier. Educational attainment was defined as the completion of a high-school degree ('Baccalauréat'). Early (up to and including age 16 years) and late (after age 16 years) cannabis-use initiators were compared with non-users using logistic regression models controlled for inverse probability weights (IPWs) of exposure calculated based on participants' socio-demographic, juvenile and parental characteristics. In age- and sex-adjusted analyses, early cannabis initiators were more likely than non-users to have low edu...Continue Reading

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Feb 27, 2020·Substance Use & Misuse·Aria S PetrucciCarrie Cuttler
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