Research Article
Modeling Count Outcomes from HIV Risk Reduction Interventions: A Comparison of Competing Statistical Models for Count Responses
Table 4
Intervention effect for all types of vaginal sex episodes outcome from ZIP and ZINB.
| Variables | Coefficient of intervention with control as a reference | Standard Error | Chi-square | value |
| Poisson regression part from ZIP | | | | | 3 months | −0.1495 | 0.0255 | 34.44 | <0.0001 | 6 months | −0.1373 | 0.0252 | 29.68 | <0.0001 | 12 months | −0.1400 | 0.0238 | 34.65 | <0.0001 | Negative binomial part from ZINB | | | | | 3 month | −0.2215 | 0.0795 | −2.79 | 0.0055 | 6 months | −0.1407 | 0.0888 | −1.58 | 0.1138 | 12 months | −0.1911 | 0.0966 | −1.98 | 0.0486 | Logistic regression Part from ZIP | | | | | 3 months | 0.2252 | 0.2409 | 0.87 | 0.3499 | 6 months | 0.7859 | 0.2407 | 10.66 | 0.0011 | 12 months | 0.1227 | 0.2534 | 0.23 | 0.6282 | Logistic regression part from ZINB | | | | | 3 months | −0.2144 | 0.5684 | −1.22 | 0.2208 | 6 months | 1.0068 | 0.3521 | 2.86 | 0.0044 | 12 months | 0.0813 | 0.3306 | 0.25 | 0.8059 |
|
|