The iSTART intervention is a 30-day substance prevention web-app whereby students complete five weekly interactive modules using a smart device or computer. Each module is approximately 15 minutes long, and focuses on a select substance: (i) alcohol, (ii) marijuana, (iii) nicotine, (iv) prescription drugs, and (v) illicit drugs. The modules are based on key theoretical constructs, behavior change strategies, and practical module components: attitudes (knowledge), perceived susceptibility (risk perceptions), subjective norms (normative re-education), and self-efficacy (refusal skills). This intervention will be evaluated via a time series design using a sample of 600 students randomly assigned to either the intervention, comparison, or control condition at a public institution in southern California.
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Change from baseline alcohol use behavior at 3 months.
Timeframe: Baseline and 90-days following intervention completion.
Change from baseline binge drinking at 3 months.
Timeframe: Baseline and 90-days following intervention completion.
Change from baseline tobacco use at 3 months.
Timeframe: Baseline and 90-days following intervention completion.
Change from baseline electronic vaping at 3 months.
Timeframe: Baseline and 90-days following intervention completion.
Change from baseline marijuana use at 3 months.
Timeframe: Baseline and 90-days following intervention completion.
Change from baseline non-prescribed prescription drug use at 3 months.
Timeframe: Baseline and 90-days following intervention completion.
Change from baseline illicit drug use at 3 months.
Timeframe: Baseline and 90-days following intervention completion.