Table 2. Project MIX primary and secondary outcome behaviors, by group at assessment wave, 2004–2008.
| Behavior Soon Before or During Most Recent Anal Sex Encounter | Baseline (%) | 3 mo (%) | 6 mo (%) | 12 mo (%) | ||||||
| Interv (n = 599) | Attn (n = 607) | Stand (n = 480) | Interv (n = 524) | Attn (n = 537) | Stand (n = 374) | Interv (n = 520) | Attn (n = 538) | Interv (n = 537) | Attn (n = 542) | |
| Primary outcome | ||||||||||
| UA | 67 | 68 | 68 | 43 | 44 | 43 | 43 | 42 | 40 | 38 |
| DUA | 39 | 38 | 43 | 19 | 21 | 23 | 17 | 18 | 18 | 20 |
| Substance use and UA | ||||||||||
| Alcohol | 42 | 40 | 42 | 21 | 21 | 21 | 20 | 21 | 17 | 17 |
| Drugs | 45 | 43 | 39 | 26 | 24 | 22 | 27 | 23 | 22 | 19 |
| Substance use and DUA | ||||||||||
| Alcohol | 27 | 23 | 28 | 10 | 11 | 13 | 8 | 9 | 9 | 10 |
| Drugs | 25 | 24 | 24 | 12 | 12 | 11 | 10 | 9 | 10 | 11 |
| Secondary outcome | ||||||||||
| URA | 38 | 41 | 39 | 24 | 26 | 25 | 23 | 24 | 25 | 22 |
| UIA | 39 | 36 | 35 | 24 | 22 | 21 | 24 | 23 | 20 | 20 |
| Substance use | 77 | 78 | 75 | 54 | 52 | 53 | 52 | 49 | 46 | 44 |
Attn, attention-control group; Interv, intervention group; Stand, standard group; URA, unprotected receptive anal sex; UIA, unprotected insertive anal sex.