Table 1.

Items included in the screening questionnaire

Item	Administered to participants
1. In the past year, how often have you used tobacco?	#1–27
2. In the past year, how often have you used alcohol, X or more drinks in a day? (X = 5 for men and = 4 for women)	#1–27
3. In the past year, how often have you used any illegal drug?	#1–27
4(a). In the past year, how often have you used any prescription drug for non-medical reasons? 4(b). In the past year, how often have you used any prescription drug recreationally?	#1–16 (interviewer administered) #17–27 (self administered)