Table 1.
Incidence Cases of Anal Warts, Follow-up Time, and Incidence Rate of the Entire Women’s Interagency HIV Study by Serostatus Group
| Serostatus |
|||||
| HIV (+) | HIV (–) | Seroconverterb | Unknownb | Total | |
| No. of incidence cases of anal warts | 644 | 77 | 3 | 0 | 724 |
| Person-years follow-up of anal warts incidence cases | 1938 | 236 | 21 | 2195 | |
| Number of nonwart cases by serostatus group | 1777 | 834 | 13 | 1 | 2625a |
| Person-years follow-up of never developed anal warts | 13 578 | 5706 | 123 | 11 | 19 418 |
| Total person-years follow-up (by groups) | 15 516 | 5942 | 144 | 11 | 21 613 |
| Incidence rate (person-years) | 0.0415 | 0.0130 | 0.0208 | 0.0000 | 0.0335 |
| (95% CI, .0383–.0477)b | (95% CI, .0100–.0158)b | (95% CI, .007–.052)c | (95% CI, .0311–.0360) | ||
Abbreviations: CI, confidence interval; HIV, human immunodeficiency virus.
a
This total already excludes 417 cases of anal warts at baseline visit.
b
Calculation of 95% CI based on normal distribution.
c
Calculation of 95% CI based on Poisson distribution.