Table 3.
Bivariate and Multivariate Associations Between Sexual Risk-taking/Stimulant-use Outcomes and Conditions
| No. of Male Sexual Partners at 6 m Follow-up |
No. Times Engaged in Condomless Anal Intercourse at 6 m Follow-up |
No. of Stimulant Metabolite-free Urine Samples Submitted During Intervention |
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|---|---|---|---|---|---|---|---|---|
| Bivariate (NCYC = 59; CM = 56) |
Bivariate (NCYC = 59; CM = 56) |
Bivariate (NCYC = 70; CM = 70) |
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| Student t test |
Student t test (Unequal Variance) |
Student t test |
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| NCYC | CM | P Value | NCYC | CM | P Value | NCYC | CM | P Value |
| Mean = 1.48 | Mean = 1.68 | P = .60 | Mean = 1.39 | Mean = 0.82 | P = .43 | Mean = 6.06 | Mean = 8.87 | P = .04 |
| SD = 1.99 | SD = 2.11 | SD = 5.06 | SD = 1.78 | SD = 6.12 | SD = 9.21 | |||
| Multivariatea (NCYC = 57; CM = 55) |
Multivariatea (NCYC = 57; CM = 55) |
Multivariatea (NCYC = 68; CM = 69) |
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| Robust Negative Binomial Regression |
Robust Negative Binomial Regression |
Robust Negative Binomial Regression |
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| IRR (95% CI) | P Value | IRR (95% CI) | P Value | IRR (95% CI) | P Value | |||
| CM | 1.10 (0.67–1.81) | P = .71 | CM | .66 (0.26–1.69) | P = .39 | CM | 1.57 (1.12–2.22) | P = .01 |
All significance tests 2-tailed.
Abbreviations: CI, confidence interval; CM, contingency management; IRR, incidence rate ratio; NCYC, noncontingent yoked condition; SD, standard deviation.
a Controls: race/ethnicity, sexual identity, income, homelessness.