Table 1.
Demographics and Smoking Behavior by Study Group (n=734)
| Total (n=734) | NC-F (n=62) | NC-L (n=29) | HC-C (n=227) | HC-LA (n=128) | p-value | |
|---|---|---|---|---|---|---|
| Age (years, mean ± SD) | 20.7±2.7 | 21.2±2.9 | 21.2±3.5 | 20.5±2.6 | 20.5±2.4 | 0.148 |
| Education (% ≥ some college) | 69% | 66% | 72% | 77% | 67% | 0.155 |
| Work Status (%) | 0.001 | |||||
| Employed | 57% | 73% | 66% | 54% | 54% | |
| Student | 24% | 18% | 28% | 30% | 30% | |
| Other | 7% | 5% | 7% | 7% | 5% | |
| Missing | 11% | 5% | 0% | 9% | 11% | |
| Race (% White) | 77% | 84% | 79% | 83% | 80% | 0.802 |
| Daily Smoker (%) 1 | 62% | 61% | 48% | 59% | 57% | 0.688 |
| Cigarettes/Day (mean ± SD) | 7.3±6.7 | 6.7±5.5 | 5.2±5.4 | 7.5±7.3 | 6.9±5.9 | 0.342 |
| Dependence (% smoke <30 minutes of waking) | 35% | 32% | 17% | 33% | 35% | 0.848 |
1
Defined as smoking on at least 27 of the past 30 days.
SD=Standard Deviation; NC-F=Natural Cycle - Follicular Phase; NC-L=Natural Cycle -Luteal Phase; HC-C=Hormonal Contraceptive – Cyclical; HC-LA=Hormonal Contraceptive – Long-Acting