Table A1.

Baseline survey measures.

Construct	Question stem	Response options and data coding
Sex	What is your sex?	1 Male 0 Female
Race/ethnicity	How do you describe yourself? (Mark all that apply.)	1 White (Caucasian) 0 Black or African American 0 Mexican American or Chicano 0 Cuban American 0 Puerto Rican 0 Other Hispanic or Latino Asian American 0 American Indian or Alaska Native 0 Native Hawaiian or Other Pacific Islander
Parental education	What is the highest level of schooling your father completed?	0 Completed grade school or less 0 Some high school 0 Completed high school 1 Some college
	What is the highest level of schooling your mother completed?	1 Completed college 1 Graduate or professional school after college . Don’t know, or does not apply
College plans	How likely is it that you will graduate from college (four-year program) after high school?	0 Definitely won’t 0 Probably won’t 0 Probably will 1 Definitely will
Alcohol: Lifetime	On how many occasions (if any) have you had an ALCOHOLIC BEVERAGE to drink – more than just a few sips… …in your lifetime?	0 0 Occasions 1 1–2 Occasions 1 3–5 Occasions 1 6–9 Occasions 1 10–19 Occasions 1 20–39 Occasions
Alcohol: Last 12 months	…during the last 12 months?	1 40 or More
Alcohol: Binge, last 2 weeks	Think back over the LAST TWO WEEKS. How many times have you had 5 OR MORE drinks in a row?	0 None 1 Once 1 Twice 1 Three to five times 1 Six to nine times 1 Ten or more times
Marijuana: Lifetime	On how many occasions	0 0 Occasions
	(if any) have you used MARIJUANA OR HASHISH… …in your lifetime? …during the last 12 months?	1 1–2 Occasions 1 3–5 Occasions 1 6–9 Occasions 1 10–19 Occasions 1 20–39 Occasions 1 40+ Occasions
Marijuana: Last 12 months
Other illegal drug use: Lifetime	On how many occasions (if any) have you used ANY OTHER ILLEGAL DRUGS… …in your lifetime?
Other illegal drug use: Last 12 months	…during the last 12 months?