Table 4.
Pairwise Comparisons Between HIV and SUR Conditions Testing Condition × Time Interactions
| Variable | Comparison | Est. | SE | z | p |
|---|---|---|---|---|---|
| Frequency of unprotected vaginal sex | HIV vs. SUR | 0.246 | 0.126 | 1.96 | .025 |
| Time | −0.093 | 0.028 | −3.34 | .001 | |
| HIV vs. SUR × Time | −0.325 | 0.100 | −3.24 | .001 | |
| No. of partners | HIV vs. SUR | −0.065 | 0.109 | −0.60 | .550 |
| Time | −0.107 | 0.024 | −4.39 | .001 | |
| HIV vs. SUR × Time | −0.036 | 0.085 | −0.42 | .339 | |
| No. of casual partners | HIV vs. SUR | −0.028 | 0.180 | −0.15 | .878 |
| Time | −0.192 | 0.049 | −3.91 | .001 | |
| HIV vs. SUR × Time | −0.363 | 0.167 | −2.17 | .015 | |
| Communicating about safer sex | HIV vs. SUR | 0.046 | 0.167 | 0.27 | .785 |
| Time | −0.188 | 0.040 | −4.73 | .001 | |
| HIV vs. SUR × Time | 0.416 | 0.137 | 3.05 | .001 | |
| Knowledge | HIV vs. SUR | −5.327 | 1.804 | −2.95 | .003 |
| Time | −0.046 | 0.217 | −0.21 | .833 | |
| HIV vs. SUR × Time | 8.918 | 0.789 | 11.31 | .001 | |
| Condom attitudes | HIV vs. SUR | 0.088 | 0.707 | 0.12 | .901 |
| Time | 0.375 | 0.168 | 2.24 | .025 | |
| HIV vs. SUR × Time | 1.006 | 0.611 | 1.65 | .045 | |
| Condom use intentions | HIV vs. SUR | 0.065 | 0.914 | 0.07 | .944 |
| Time | −0.070 | 0.151 | −0.49 | .624 | |
| HIV vs. SUR × Time | 1.841 | 0.549 | 3.35 | .001 | |
| Decisional balance (pros of condom use) | HIV vs. SUR | 0.068 | 0.466 | 0.15 | .885 |
| Time | −0.039 | 0.080 | −0.49 | .623 | |
| HIV vs. SUR × Time | 0.319 | 0.290 | 1.10 | .136 | |
| Decisional balance (cons of condom use) | HIV vs. SUR | 0.375 | 0.531 | 0.71 | .480 |
| Time | −0.303 | 0.097 | −3.11 | .002 | |
| HIV vs. SUR × Time | 0.116 | 0.354 | 0.33 | .742 | |
| Behavioral skills | HIV vs. SUR | −3.360 | 1.581 | −2.13 | .034 |
| Time | −0.305 | 0.284 | −1.07 | .283 | |
| HIV vs. SUR × Time | 2.693 | 1.031 | 2.61 | .005 |
Note. HIV = HIV-risk reduction condition (n = 123); SUR = substance use reduction condition (n = 121). Positive regression coefficients indicate increase, negative coefficients indicate decrease over time. The p values for Condition × Time interaction effects reflect one-tailed values for beta coefficients that show the hypothesized change. Est. = estimate.