Perceived versus objective transmission risk under four scenarios
| Parameter | Objective | Perceived | Perceived (percentile) | ||||
| (mean) | 10th | 25th | 50th | 75th | 90th | ||
| Risk of HIV transmission (%) | |||||||
| Scenario 1: one sex act | 0.30 | 78.3 | 45 | 65 | 85 | 100 | 100 |
| Scenario 2: one sex act with ART | 0.01 | 65.1 | 25 | 50 | 65 | 95 | 100 |
| Scenario 3: 52 sex acts | 14.5 | 87.9 | 50 | 90 | 100 | 100 | 100 |
| Scenario 4: 52 sex acts with ART | 0.62 | 73.1 | 35 | 55 | 75 | 100 | 100 |
| Efficacy of TasP | |||||||
| Population average | 96% | 16.8% | |||||
| Individual-specific | 20.3% | 0% | 0% | 10% | 33% | 50% | |
Note: n=365. Table displays mean perceived transmission risk across the four scenarios in the study sample. Transmission risks are probabilities expressed as percentages. Efficacy of TasP is computed as the relative (percent) reduction in transmission risk associated with ART. Objective risks are computed based on a uniform 0.3% per-act transmission risk18 and a 96% relative reduction in per-act transmission with ART.1
ART, antiretroviral therapy; TasP, treatment as prevention .