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The overall effect of parental supply of alcohol across adolescence on alcohol-related harms in early adulthood-a prospective cohort study

Clare, PJ, Dobbins, T, Bruno, R ORCID: 0000-0001-6673-833X, Peacock, A ORCID: 0000-0002-5705-2026, Boland, V, Yuen, WS, Aiken, A, Degenhardt, L, Kypri, K, Slade, T, Hutchinson, D, Najman, JM, McBride, N, Horwood, J, McCambridge, J and Mattick, RP 2020 , 'The overall effect of parental supply of alcohol across adolescence on alcohol-related harms in early adulthood-a prospective cohort study' , Addiction, vol. 115, no. 10 , 1833–1843 , doi: 10.1111/add.15005.

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Background and Aims Recent research suggests that parental supply of alcohol is associated with more risky drinkingand alcohol-related harm among adolescents. However, the overall effect of parental supply throughout adolescence remainsunclear, because parental supply of alcohol varies during adolescence. Due to the complexity of longitudinal data,standard analytical methods can be biased. This study examined the effect of parental supply of alcohol on alcohol-relatedoutcomes in early adulthood using robust methods to minimize risk of bias. Design Prospective longitudinal cohortstudy. Setting Australia Participants A cohort of school students (n = 1906) recruited in the first year of secondaryschool (average age 12.9 years) from Australian schools in 2010–11, interviewed annually for 7 years.Measurements The exposure variable was self-reported parental supply of alcohol (including sips/whole drinks) during5 years of adolescence (waves 1–5). Outcome variables were self-reported binge drinking, alcohol-related harm and symptomsof alcohol use disorder, measured in the two waves after the exposure period (waves 6–7). To reduce risk of bias, weused targeted maximum likelihood estimation to assess the (counterfactual) effect of parental supply of alcohol in all fivewaves versus no supply on alcohol-related outcomes. Findings Parental supply of alcohol throughout adolescence sawgreater risk of binge drinking [risk ratios (RR) = 1.53; 95% confidence interval (CI) = 1.27–1.84] and alcohol-relatedharms (RR = 1.44; 95% CI = 1.22–1.69) in the year following the exposure period compared with no supply in adolescence.Earlier initiation of parental supply also increased risk of binge drinking (RR = 1.10; 95% CI = 1.05–1.14), andany alcohol-related harm (RR = 1.09; 95% CI = 1.05–1.13) for each year earlier parental supply began compared withlater (or no) initiation. Conclusions Adolescents whose parents supply them with alcohol appear to have an increasedrisk of alcohol-related harm compared with adolescents whose parents do not supply them with alcohol. The risk appearsto increase with earlier initiation of supply.

Item Type: Article
Authors/Creators:Clare, PJ and Dobbins, T and Bruno, R and Peacock, A and Boland, V and Yuen, WS and Aiken, A and Degenhardt, L and Kypri, K and Slade, T and Hutchinson, D and Najman, JM and McBride, N and Horwood, J and McCambridge, J and Mattick, RP
Keywords: parental supply of alcohol, Adolescence, alcohol, cohort studies, confounding, epidemiology, targeted maximum likelihood
Journal or Publication Title: Addiction
Publisher: Blackwell Publishing Ltd
ISSN: 0965-2140
DOI / ID Number: 10.1111/add.15005
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Copyright 2020 Society for the Study of Addiction

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