Research Article
Modeling Count Outcomes from HIV Risk Reduction Interventions: A Comparison of Competing Statistical Models for Count Responses
Table 3
Percentage of zeros captured by the POIS, NB, ZIP, and ZINB models.
| Outcome | Observed | POIS | NB | ZIP | ZINB |
| All types of vaginal sex episodes | | | | | | 3 months | 16.353 | 0.0437 | 10.968 | 16.353 | 11.932 | 6 months | 17.897 | 0.0417 | 13.134 | 16.974 | 17.877 | 12 months | 16.284 | 0.0021 | 11.578 | 15.449 | 11.578 | Unprotected vaginal sex with steady partners | | | | | | 3 months | 43.667 | 3.836 | 41.545 | 43.663 | 41.545 | 6 months | 42.379 | 1.664 | 40.358 | 42.379 | 40.358 | 12 months | 33.689 | 0.298 | 32.337 | 33.688 | 32.337 | Unprotected vaginal sex with other partners | | | | | | 3 month | 87.608 | 73.448 | 87.608 | 87.516 | 87.743 | 6 months | 89.610 | 77.570 | 89.533 | 89.565 | 89.468 | 12 months | 86.498 | 69.631 | 86.344 | 86.481 | 86.311 | Any unprotected vaginal sex with steady or other partners | | | | | | 3 months | 39.474 | 3.322 | 36.825 | 39.469 | 38.617 | 6 months | 39.668 | 1.753 | 37.016 | 39.666 | 37.016 | 12 months | 29.436 | 0.225 | 28.576 | 29.436 | 29.597 |
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