TABLE 1. Group comparisons on demographic and primary study variables (N = 42).
| Smokers | Nonsmokers | |
|---|---|---|
| (N = 20) | (N = 22) | |
| Age (years; M [SD]) | 16.6 (1.14) | 16.05 (1.49) |
| Sex (% female) | 45 | 50 |
| Race (N; black:white: other) | 1/19/0 | 0/20/1 |
| KBIT 2 (IQ standard score; M [SD]) | 90.9 (12.81) | 95.41 (12.94) |
| Cigarettes (number per day; M [SD])a | 15.13 (9.15)A | .00 (.00)B |
| Carbon monoxide (ppm; M [SD]) | 9.45 (4.97)A | 2.00 (.87)B |
| Cotinine (ng/ml; M [SD]) | 1313.2 (624.34)A | .45 (.91)B |
| How many friends smoke (M [SD])b | 3.7 (.92)A | 1.86 (1.04)B |
| Closest/best friend smokes (% reporting yes) | 95A | 22.2B |
| At least one parent smoke (% reporting yes) | 90A | 54.5B |
| Marijuana (M [SD])c | 1.75 (1.86)A | .36 (1.09)B |
| Alcohol (M [SD])c | 1.7 (1.13)A | .77 (.10)B |
| BIS-11-A total score (M [SD]) | 70.95 (11.53)A | 61.05 (10.31)B |
| AUC from DDQ (M [SD]) | .317 (.290) | .454 (.303) |
Means or percentages in the same row that do not share the same superscript differ at p < .05.
a
Cigarettes per day were calculated using a timeline follow back calendar to determine cigarettes smoked each day during the past 14 days.;
b
Friends who smoke was assessed using the following question: “How many of your friends smoke cigarettes/black & milds?”: 1 = none, 2 = some, 3 = half, 4 = most, and 5 = all.;
c
Drug use was assessed with the following question: “Thinking about the past 6 months, how often have you used the following substances?”: 1 = tried it, 2 = 1–2 times/month, 3 = once a week, 4 = 2–4 times/week, 5 = 5 or more times a week.