TABLE 1.

—Indicators of Substance Use and Abuse: Add Health Study, 1995–1996

Indicator	Description
Smoking	Wave 1: smoking (number of cigarettes in past month) calculated as the product of the number of days the respondents reported smoking in the previous 30 days and the number of cigarettes they reported smoking on the days they smoked during that period; change between waves: wave 2 minus wave 1
Intoxication	Wave 1: number of days respondents had gotten drunk (frequency) in the past 12 months (0 = never drank alcohol, 1 = never been drunk, 2 = once a month or less, 3 = 2 to 8 days a month, 4 = every day or almost every day); change between waves: wave 2 minus wave 1
Drinking alone	Respondents were asked whether they had ever drunk alcohol while alone; change between waves: initiating drinking alone between waves 1 and 2
Problems caused by drinking	Average of 4 items measuring whether respondents' drinking caused them problems with their parents, at school, with their friends, and with someone they had been dating in the previous 12 months (0 = never drank or no problem, 1 = once, 2 = twice, 3 = 3–4 times, 4 = 5 or more times); change between waves: wave 2 minus wave 1
Sexual regret from drinking	Respondents were asked whether in the past 12 months they had gotten into a sexual situation because they had been drinking and whether they had later experienced regret (0 = never drank or no problem, 1 = once, 2 = twice, 3 = 3–4 times, 4 = 5 or more times); change between waves: wave 2 minus wave 1
Marijuana use	Number of times respondents reported using marijuana in the previous 30 days (0 = never used, 1 = 1 or 2 times, 2 = 3 or more times); change between waves: wave 2 minus wave 1
Other drug use	Reports of history of use of cocaine in any form, inhalants, or other illegal drugs, such as LSD, PCP, or ecstasy (dichotomous, 1 = yes); change between waves: initiating other drug use between waves 1 and 2