Table 1. Demographic characteristics of the two genotype groups.
|
Study 1: Laboratory experiment |
Study 2: fMRI |
|||
|---|---|---|---|---|
| Subject variable | CG (N=10) | CC (N=57) | CG (N=5) | CC (N=8) |
| Gender (male) (%) | 5 (50%) | 31 (54.39%) | 2 (40%) | 3 (37.5%) |
| Age (year±s.e.) | 37.7 (7.30) | 37.51 (6.48) | 38.2 (7.12) | 38.12 (5.96) |
| Average years of education (±s.e.) | 11.6 (0.97) | 12.4 (1.91) | 11.8 (1.09) | 12.5 (1.60) |
| Average years of cocaine use (±s.e.) | 11.5 (5.97) | 10.05 (5.58) | 13 (3.32) | 12.13 (6.45) |
| Average days of cocaine use/month (±s.e.) | 17.5 (10.49) | 17.65 (8.10) | 15.8 (11.9) | 16 (7.8) |
| Total amount (g) of cocaine use in the past 90 days (±s.e.) | 29.23 (21.42) | 61.13 (106.2) | 20.44 (15.65) | 56.17 (42.08) |
| Average years of alcohol use (±s.e.) | 15.89 (9.7) | 11.19 (8.34) | 14.75 (10.72) | 13.12 (9.30) |
| Average days of alcohol use/month (±s.e.) | 7.9 (7.4) | 10.55 (9.16) | 5.2 (6.3) | 9.25 (9.84) |
| Regular cigarette smokers: N (%)* | 10 (100%) | 46 (80%) | 5 (100%) | 6 (75%) |
Abbreviation: fMRI, functional magnetic resonance imaging.
*P<0.05. Note: No significant differences were observed across all variables between the genotype groups in either the laboratory study or the fMRI study of the participants (P's>0.05). The CG group included significantly more cigarette smokers than the CC group (P<0.05).