Table 1.

Means, standard deviations and skewness of raw variables including drinking alcohol, heavy episodic drinking, and illegal drug use at Wave 1

Raw variable	n	M	SD	Min.	Max.	Skewness
Heavy episodic drinking last 30 days	2,142	1.48	1.07	1	6	2.40
Drank alcohol last 30 days	2,157	1.58	1.12	1	7	2.50
Marijuana last 12 months	2,150	1.65	1.49	1	7	2.51
Ecstasy last 12 months	2,147	1.06	0.36	1	7	7.47
Amphetamines last 12 months	2,149	1.02	0.27	1	7	16.64
Opiates last 12 months	2,144	1.03	0.30	1	7	14.45
Medication to get high last 12 months	2,149	1.11	0.59	1	7	6.43
Cocaine last 12 months	2,147	1.03	0.29	1	7	11.98
Glue or solvents last 12 months	2,148	1.01	0.22	1	7	18.38
LSD last 12 months	2,148	1.02	0.25	1	7	16.07
Anabolic steroids last 12 months	2,141	1.02	0.22	1	7	16.49
Other drug last 12 months	2,016	1.06	0.47	1	7	10.12
Baltok last 12 months	2,147	1.01	0.15	1	7	32.87

Notes: Min. = minimum; max. = maximum; LSD = lysergic acid diethylamide. Baltok, a fake drug name, was used as an indicator that the respondent might not be taking the survey seriously. We identified two participants who reported having used Baltok as well as all other drugs by checking the option 7 (40+ times) and assumed that they have over reported substance use, so they were excluded from the analysis. Therefore, the same size used for analysis was reduced to n = 2,177.