Table 1 Baseline participant characteristics.
Low dependence smokers | High dependence smokers | |||
|---|---|---|---|---|
21 mg | 42 mg | 21 mg | 42 mg | |
Age, mean (SD) | 43.2 (11.1) | 42.2 (11.4) | 45.0 (11.2) | 43.8 (10.9) |
Gender (male/female) Race/ethnicity | 45/70 | 46/70 | 51/67 | 60/58 |
European American, n (%) | 92 (80.0) | 80 (70.0) | 99 (83.9) | 87 (73.7) |
African-American, n (%) | 19 (16.5) | 27 (23.3) | 17 (14.4) | 24 (20.3) |
Other, n (%) | 4 (3.5) | 9 (7.8) | 2 (1.7) | 7 (5.9) |
Nicotine yield, mean (SD) | 0.87 (0.2) | 0.90 (.90) | 0.91 (.28) | 0.96 (.27) |
Cigarettes/day, mean (SD) | 19.4 (8.0) | 18.9 (6.6) | 29.4 (9.9) | 28.2 (11.2) |
Years smoked, mean (SD) | 23.8 (10.5) | 22.7 (11.1) | 26.8 (11.6) | 25.6 (10.6) |
FTND score, mean (SD) | 4.6 (1.6) | 4.7 (1.5) | 8.0 (1.0) | 8.0 (1.0) |
End-expired air CO, mean (SD) | 24.9 (9.5) | 24.3 (9.7) | 31.0 (13.1) | 29.7 (10.8) |