Table 3 Power for comparison of HIV incidence in Arm A or B with Arm C, with 7 communities per arm and Population Cohort of 2,500 adults per community (assuming that on average 2,125 (85%) will be HIV-uninfected at baseline and that loss to follow-up will be 20% after 2 years and 25% after 3 years) with 5,206 person-years per community over 36 months
HIV incidence rate/100 py (control arm) | Between-cluster coefficient of variation (k) | Effectiveness (%) | Power (%) |
|---|---|---|---|
1.0 | 0.15 | 25% | 57% |
1.0 | 0.15 | 30% | 74% |
1.0 | 0.15 | 35% | 87% |
1.0 | 0.15 | 40% | 95% |
1.0 | 0.15 | 45% | 99% |
1.0 | 0.15 | 50% | 100% |
1.0 | 0.15 | 55% | 100% |
1.0 | 0.15 | 60% | 100% |
1.0 | 0.15 | 65% | 100% |
1.0 | 0.20 | 25% | 44% |
1.0 | 0.20 | 30% | 60% |
1.0 | 0.20 | 35% | 75% |
1.0 | 0.20 | 40% | 87% |
1.0 | 0.20 | 45% | 94% |
1.0 | 0.20 | 50% | 98% |
1.0 | 0.20 | 55% | 99% |
1.0 | 0.20 | 60% | 100% |
1.0 | 0.20 | 65% | 100% |
1.5 | 0.15 | 25% | 64% |
1.5 | 0.15 | 30% | 81% |
1.5 | 0.15 | 35% | 92% |
1.5 | 0.15 | 40% | 98% |
1.5 | 0.15 | 45% | 100% |
1.5 | 0.15 | 50% | 100% |
1.5 | 0.15 | 55% | 100% |
1.5 | 0.15 | 60% | 100% |
1.5 | 0.15 | 65% | 100% |
1.5 | 0.20 | 25% | 48% |
1.5 | 0.20 | 30% | 65% |
1.5 | 0.20 | 35% | 80% |
1.5 | 0.20 | 40% | 91% |
1.5 | 0.20 | 45% | 96% |
1.5 | 0.20 | 50% | 99% |
1.5 | 0.20 | 55% | 100% |
1.5 | 0.20 | 60% | 100% |
1.5 | 0.20 | 65% | 100% |