Table 2.
Characteristics of HIV-negative Multicenter AIDS Cohort Study (MACS) participants at the index visit (10/1/2003 – 9/30/2004).
| Characteristic | Sexual Risk Trajectory Group
|
Total (N=419) | ||||||
|---|---|---|---|---|---|---|---|---|
| Low Risk (N=264) | Moderate Risk (N=96) | High Risk (N=59) | ||||||
|
| ||||||||
| n | % | n | % | n | % | n | % | |
| Study center | ||||||||
| Baltimore | 82 | 31.1 | 15 | 15.6 | 19 | 32.2 | 116 | 27.7 |
| Chicago | 46 | 17.4 | 14 | 14.6 | 9 | 15.3 | 69 | 16.5 |
| Los Angeles | 68 | 25.8 | 42 | 26.0 | 14 | 23.7 | 107 | 25.5 |
| Pittsburgh | 68 | 25.8 | 25 | 43.8 | 17 | 28.8 | 127 | 30.3 |
| Mean age in years (SD) | 40.5 | 8.9 | 34.3 | 9.7 | 34.4 | 10.8 | 38.3 | 9.8 |
| Race/Ethnicity | ||||||||
| White non-Hispanic | 73 | 27.7 | 55 | 57.3 | 33 | 55.9 | 161 | 38.4 |
| Black non-Hispanic | 147 | 55.7 | 19 | 19.8 | 11 | 18.6 | 177 | 42.2 |
| Hispanic | 32 | 12.1 | 18 | 18.8 | 13 | 22.0 | 63 | 15.0 |
| Other | 12 | 4.6 | 4 | 4.2 | 2 | 3.4 | 18 | 4.3 |
| Education | ||||||||
| ≤ High school graduate | 100 | 37.9 | 15 | 15.6 | 9 | 15.3 | 124 | 29.6 |
| Some College | 64 | 24.2 | 30 | 31.3 | 19 | 32.2 | 113 | 27.0 |
| ≥ College graduate | 100 | 37.9 | 51 | 53.1 | 31 | 52.5 | 182 | 43.4 |
| Annual income ≥ $20,000 | 93 | 35.2 | 58 | 60.4 | 41 | 69.5 | 192 | 45.8 |
| Distress/depression (CESD ≥16) | 135 | 51.1 | 55 | 57.3 | 40 | 67.8 | 230 | 54.9 |
| Male sex partner since last visit | 131 | 49.6 | 94 | 97.9 | 59 | 100.0 | 284 | 67.8 |
| Mean # of male sex partners (SD) | 4.4 | 7.1 | 9.4 | 23.1 | 14.6 | 22.1 | 8.1 | 17.7 |
| RAI since last visit | 52 | 19.7 | 69 | 71.9 | 57 | 96.6 | 178 | 42.5 |
| Mean # of RAI partners (SD) | 1.5 | 1.7 | 3.5 | 6.7 | 7.5 | 14.1 | 4.2 | 9.3 |
| URAI | 20 | 38.5 | 39 | 56.5 | 47 | 82.5 | 106 | 59.6 |
| URAI with ≥1 serodiscordant partner | 3 | 5.8 | 13 | 18.8 | 30 | 52.6 | 46 | 25.8 |
| IAI since last visit | 85 | 32.2 | 71 | 74.0 | 50 | 84.8 | 206 | 49.2 |
| Mean # of IAI partners (SD) | 2.3 | 2.8 | 5.9 | 11.6 | 7.1 | 14.1 | 4.7 | 10.1 |
| UIAI | 41 | 48.2 | 45 | 63.4 | 39 | 78.0 | 125 | 60.7 |
| UIAI with ≥1 serodiscordant partner | 16 | 18.8 | 23 | 32.4 | 24 | 48.0 | 63 | 30.6 |
| Substance use since last visit | ||||||||
| Any substance use^ | 87 | 33.0 | 37 | 38.5 | 32 | 54.2 | 156 | 37.2 |
| ≥5 alcohol beverages per day | 36 | 13.6 | 18 | 18.8 | 11 | 18.6 | 65 | 15.5 |
| Marijuana | 86 | 32.6 | 38 | 39.6 | 29 | 49.2 | 153 | 36.5 |
| Amyl nitrates (poppers) | 21 | 8.0 | 23 | 24.0 | 22 | 37.3 | 66 | 15.8 |
| Crack | 53 | 20.1 | 13 | 13.5 | 4 | 6.8 | 70 | 16.7 |
| Other Cocaine | 26 | 9.9 | 11 | 11.5 | 4 | 6.8 | 41 | 9.8 |
| Uppers (crystal, methamphetamines) | 9 | 3.4 | 11 | 11.5 | 9 | 15.3 | 29 | 6.9 |
Numbers may not sum to column totals due to missing data; Percents may not sum to 100 due to rounding or omission of one category for binary variables.
^
Excludes alcohol and marijuana, but includes amyl nitrates, crack, other cocaine, and uppers.
SD = standard deviation; CESD = Center for Epidemiologic Studies Depression Scale; IAI = insertive anal intercourse; UIAI = unprotected insertive anal intercourse; RAI = receptive anal intercourse; URAI = unprotected receptive anal intercourse