Table 1.
Participant demographic and baseline characteristics as a function of baseline ADHD symptom severity.
| Low baseline ADHD severity (n = 121) | High baseline ADHD severity (n = 134) | X2 or F-test | p | |
|---|---|---|---|---|
| ADHD Rating Scale Scores at baseline: | 29.93 (3.52) | 42.16 (4.34) | F(1,253) = 602.46 | <.0001 |
| ADHD combined subtype (hyperactive + inattentive) | 46.7% | 82.8% | X2(1) = 36.78 | <.0001 |
| Other baseline features | ||||
| Demographics: | ||||
| Male (vs. female) | 62.0% | 51.5% | X2(1) = 2.85 | 0.09 |
| Age (years) | 38.77 (9.88) | 36.91 (10.05) | F(1, 251) = 2.20 | 0.14 |
| Caucasian (vs. not) | 80.0% | 79.7% | X2(1) = 0.00 | 0.95 |
| Education (years) | 14.50 (2.35) | 14.36 (2.45) | F(1, 250) = 0.23 | 0.64 |
| Marital status | X2(2) = 7.58 | 0.03 | ||
| Married | 42.2% | 26.1% | ||
| Divorced/separated | 18.2% | 26.1% | ||
| Never married | 39.6% | 47.8% | ||
| Nicotine dependence: | ||||
| Cigarettes smoked daily | 20.64 (7.54) | 19.75 (7.82) | F(1, 253) = 0.85 | 0.36 |
| Nicotine dependence (FTND score) | 5.57 (2.22) | 5.51 (2.21) | F(1, 252) = 0.05 | 0.84 |
| Psychiatric comorbidity: | ||||
| Major depression | 31.4% | 35.8% | X2(1) = 0.55 | 0.46 |
| Anxiety disorders | 28.1% | 38.8% | X2(1) = 3.26 | 0.07 |
| Alcohol dependence | 28.1% | 29.1% | X2(1) = 0.03 | 0.86 |
| Drug dependence | 19.0% | 24.6% | X2(1) = 1.17 | 0.28 |
Where not otherwise indicated, numbers represent means (standard deviations).