Influence of grade-level drinking norms on individual drinking behavior

An examination of how age of onset for alcohol, cannabis, and tobacco are associated with physical activity, screen time and BMI as students are preparing to graduate from high school

Introduction

In this study we examined the co-occurrence of alcohol, cannabis, and tobacco among a large cohort of grade 12 students in Canada, and then explored if the age of initiation of these substances was associated with moderate-to-vigorous physical activity (MVPA), screen time, and BMI.

Methods

This cross-sectional study used student-level data from grade 12 students in years 1 to 5 (2012–2016) of the COMPASS study. Random intercept linear regression models were used to examine the impact of age of initiation of alcohol, cannabis, and tobacco use on student average daily physical activity, daily screen time and BMI.

Results

Twenty-eight percent of students had only tried one substance with alcohol being the most reported single substance used (25%). The most common co-occurrence was students reporting having tried all three substances (27%). Nineteen percent of students reported no substance use by grade 12.

Younger age of first use of alcohol was associated with increased MVPA in grade 12. Earlier initiation of cannabis and tobacco were associated with increased screen time in grade 12. Age of first use of alcohol, cannabis and tobacco were not associated with BMI in grade 12.

Conclusion

While no specific cut-off age was identified this study indicates that for every year tobacco and cannabis use are delayed among children, there are subsequent reductions to screen time in grade 12. Early initiation of alcohol was associated with increased MVPA in grade 12. Early initiation of alcohol, cannabis and tobacco were not associated with BMI in grade 12.

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Less than 1 in 5 students reported no substance use by grade 12.

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75% of students had tried alcohol by the end of high school.

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Initiating cannabis and tobacco earlier was associated with increased screen time.

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Age of first use of all substances not associated with BMI in grade 12.

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Initiating alcohol use at a younger age was associated with more MVPA in grade 12.

The road to drink is paved with high intentions: Expectancies, refusal self-efficacy, and intentions among heavy drinking college students

The present study examined the effects of drinking intentions (DI) on alcohol expectancies (AE) and drink refusal self-efficacy (DRSE) in regard to alcohol consumption among heavy drinking undergraduates. Research shows that DRSE buffers against drinking (Young, Hasking, Oei, & Loveday, 2007) and interacts with AE to predict alcohol consumption (Oei & Burrow, 2000). Studies further show that DI is predicted by DRSE (Norman, 2011) and AE (Fleming, Thorson, & Atkin, 2004). However, additional research is needed to understand DI's influence on both DRSE and AE among heavy college drinkers. This research included 344 heavy drinking college students (mean age = 23.06 years, SD = 5.61, 74.71% female) from a large southern university who completed study material as part of a larger intervention. Findings showed that DI, DRSE, and AE interacted with respect to heavy drinking such that DRSE was negatively associated with alcohol consumption, particularly among those low in positive AE and high in negative AE. This relationship was stronger among individuals low in DI relative to those high in DI. DI seems to be an important factor influencing heavy drinking among undergraduate students. Present findings further support DI's associations with heavy drinking, regardless of an individual's DRSE or AE. Implications of this research suggest that it may be beneficial for interventions to target specific aspects of AE, including anxious drinking.