Table 1. Serologically determined and behaviorally imputed HIV incidence in young men who have sex with men 18 to 21 and 18 to 24 years in the Bangkok Men who have Sex with Men Cohort Study, 2006–2014.
| Method | Number of HIV infections | Number at risk | Median follow-up time (years, range) | Number of person years | HIV incidence density (95% CIa) |
|---|---|---|---|---|---|
| 18–21 years | |||||
| Serological estimation | 54 | 264 | 3.0 (0.0, 8.7) | 724 | 7.5 (5.6, 9.7) |
| Behavioral imputation | 50 | 314 | 674 | 7.4 (5.4, 9.5) | |
| 18–24 years | |||||
| Serological estimation | 125 | 561 | 3.7 (0.0, 8.7) | 1700 | 7.4 (6.1, 8.8) |
| Behavioral imputation | 151 | 712 | 2143 | 7.0 (5.9, 8.2) |
CI, confidence interval
a Poisson exact 95% CI for serological estimates, bootstrap normal distribution derived 95% CI for behavioral estimates, based on 10,000 replications for imputation