Table 1. Demographics by Genotype.
| Variable | BDNF Val66Met | COMT Val158Met | ||||
|---|---|---|---|---|---|---|
| Val/Val (n = 75) | Val/Met (n = 40) | Met/Met (n = 5) | Val/Val (n = 19) | Val/Met (n = 72) | Met/Met (n = 29) | |
| Age, M (sd) | 40.96 (12.67) | 42.62 (12.60) | 41.00 (10.20) | 38.16 (12.65) | 43.43 (12.51) | 38.97 (11.82) |
| Female, N (%) | 32 (42.7%) | 15 (37.5%) | 4 (80.0%) | 10 (52.6%) | 26 (36.1%) | 15 (51.7%) |
| College graduate, N (%) | 25 (33.3%) | 15 (37.5%) | 0 (0.0%) | 7 (36.8%) | 23 (31.9%) | 10 (34.5%) |
| Cigarettes per day, M (sd) | 22.09 (14.51) | 25.95 (19.23) | 19.00 (7.42) | 16.05a (7.79) | 25.94a (19.32) | 21.28a (7.30) |
| Nicotine dependence, M (sd) | 5.03 (2.64) | 5.42 (2.23) | 4.40 (2.41) | 3.79b (1.99) | 5.26b (2.63) | 5.69b (2.19) |
a
F for difference across these three means = 3.26, p = .042.
b
F for difference across these three means = 3.74, p = .027.