Table 2. Initiation and Frequency of Cigarette, Alcohol, and Marijuana Use.
| ADHD % | Control % | X2 | p | OR 95% CI | |
|---|---|---|---|---|---|
| Ever smoked a cigarette | 46.9 | 27.7 | 6.35 | .012 | 1.20-4.45 |
| Frequency of cigarette usea | 15.01 | .059 | ----- | ||
| Not at all | 59.3 | 78.5 | --- | ||
| Less than 1x per month | 11.5 | 9.2 | --- | ||
| 1-3x per month | 0.9 | 3.1 | --- | ||
| 1-6x per week | 1.8 | 3.1 | --- | ||
| Daily | 26.5 | 6.1 | --- | ||
| Ever had a drink | 73.5 | 80.0 | .96 | .326 | .33-1.45 |
| Frequency of alcohol usea | 7.58 | .577 | ----- | ||
| Not at all | 37.2 | 33.8 | |||
| Less than 1x per month | 28.3 | 35.4 | |||
| 1-3x per month | 15.9 | 18.5 | |||
| 1-6x per week | 16.8 | 12.3 | |||
| Daily | 1.8 | 0.0 | |||
| Ever tried marijuana | 53.1 | 50.8 | .09 | .765 | .60-2.02 |
| Frequency of marijuana usea | 20.17 | .043 | ----- | ||
| Not at all | 54.9 | 61.5 | |||
| Less than 1x per month | 18.5 | 21.6 | |||
| 1-3x per month | 3.6 | 9.3 | |||
| 1-6x per week | 12.4 | 1.5 | |||
| Daily | 10.6 | 6.1 |
a
Significance tests conducted on 12-category response set; however, responses were collapsed into fewer categories for ease of presentation. Frequency variable represents the highest frequency of substance use reported during year 9, 12, 13, and 14 visits.