Table 1.
Sample characteristics
| Full Sample | HIV‐positive | HIV‐negative | Statistic | |
|---|---|---|---|---|
| N = 35 | N = 18 | N = 17 | ||
| Demographics | ||||
| Male gender, n (%) | 20 (57%) | 11 (61%) | 9 (53%) | χ2(1) = 0.24 |
| Age in years, M (SD) | 41.00 (9.51) | 40.78 (9.27) | 41.24 (10.03) | t(33) = 0.14 |
| Race, n (%) | χ2(2) = 0.68 | |||
| Black | 27 (77%) | 13 (72%) | 14 (82%) | |
| White | 6 (17%) | 4 (22%) | 2 (12%) | |
| Mixed/Other | 2 (6%) | 1 (6%) | 1 (6%) | |
| Hispanic ethnicity, n (%) | 2 (6%) | 1 (6%) | 1 (6%) | FET = 1.00 |
| Education in years, M (SD) | 14.26 (2.08) | 14.17 (2.23) | 14.35 (1.97) | t(33) = 0.26 |
| Monthly income, Median (IQR) | $1,586 (1800) | $1,000 (1377) | $2,000 (2000) | U(1) = 87.50a |
| Hepatitis C diagnosis, n (%) | 1 (3%) | 1 (6%) | 0 (0%) | FET = 1.00 |
| Neurocognitive factors | ||||
| Premorbid verbal IQ, M (SD) | 91.63 (17.87) | 88.11 (18.05) | 95.35 (17.43) | t(33) = 1.21 |
| Neurocognitive impairment (GDS), M (SD) | 0.34 (0.30) | 0.39 (0.33) | 0.28 (0.26) | t(33) = 1.10 |
| Trait impulsivity, M (SD) | 56.06 (10.84) | 58.39 (12.17) | 53.59 (8.92) | t(33) = 1.32 |
| Risk‐taking propensity, M (SD) | 39.72 (14.79) | 45.14 (12.64) | 33.98 (15.07) | t(33) = 2.38a |
| Current psychiatric disorders | ||||
| Major depression, n (%) | 2 (6%) | 2 (11%) | 0 (0%) | FET = 0.49 |
| Posttraumatic stress, n (%) | 1 (3%) | 1 (6%) | 0 (0%) | FET = 1.00 |
| Other anxiety, n (%) | 0 (0%) | 0 (%) | 0 (%) | NA |
| Substance use | ||||
| Past substance dependence | ||||
| Alcohol | 2 (6%) | 1 (6%) | 1 (6%) | FET = 1.00 |
| Marijuana | 3 (9%) | 2 (11%) | 1 (6%) | FET = 1.00 |
| Days of use in 30 days prior to MRI, M (SD) | ||||
| Alcohol | 1.57 (3.14) | 0.50 (1.04) | 2.71 (4.14) | t(33) = 2.19a |
| Marijuana | 1.00 (5.06) | 1.83 (7.04) | 0.12 (0.49) | t(33) = 1.00 |
| Current smoker, n (%) | 13 (37%) | 7 (39%) | 6 (35%) | χ2(1) = 0.05 |
| Nicotine dependence (Fagerstrom score) | 2.92 (2.29) | 2.14 (1.95) | 3.83 (2.48) | t(11) = 1.38 |
a
P < 0.05; FET = Fisher's Exact Test; MDD= major depressive disorder; PTSD = posttraumatic stress disorder.