Statistical Analysis
DISORDERS
All 798 participants in the modified intention-to-treat (mITT) population were considered in the primary descriptive analysis but had to have both screening tool question(s) and a criterion standard measure for a substance (tobacco/nicotine, alcohol, and cannabis) to be used in calculating the psychometric properties. Details of randomization, screening, and criterion measure responses for tobacco/nicotine, alcohol, or cannabis use disorders are summarized in STARD flow charts in eFigures 2, 3, and 4 in Baseline characteristics were described and compared by study site, using analysis of variance or the Kruskal-Wallis test for continuous variables and the Fisher exact or χAnalyses were conducted using SAS, version 9.4 (SAS Institute Inc). Statistical significance was set at 