Annual HIV Incidence among 229 HIV-Negative MSM Diagnosed with Rectal Chlamydia or Gonorrhoea at New York City STD Clinics Between January 2008 and December 2009
| Number of patients | % | Person-years at risk | Number of HIV seroconversions by STD clinic diagnoses | Total number of HIV seroconversions after HIV registry cross-match | Annual HIV incidence | 95% CI | |
| Overall | 229 | 100% | 368.29 | 16 | 22 | 5.97 | 3.84 to 8.90 |
| Age (years): | |||||||
| <20 | 25 | 11% | 37.07 | 4 | 4 | 10.79 | 3.42 to 26.00 |
| 20–29 | 148 | 65% | 239.90 | 9 | 13 | 5.42 | 3.01 to 9.03 |
| 30–39 | 42 | 18% | 69.56 | 2 | 5 | 7.19 | 2.63 to 15.93 |
| 40+ | 14 | 6% | 21.75 | 0 | 0 | ||
| Race/ethnicity: | |||||||
| Non-Hispanic White | 71 | 31% | 116.63 | 2 | 3 | 2.57 | 0.65 to 7.00 |
| Non-Hispanic Black | 44 | 19% | 63.44 | 6 | 9 | 14.19 | 6.92 to 26.03 |
| Hispanic | 83 | 36% | 135.40 | 5 | 5 | 3.69 | 1.35 to 8.18 |
| Asian | 12 | 5% | 20.23 | 1 | 1 | 4.94 | 0.25 to 24.38 |
| Other/multiple | 19 | 8% | 32.59 | 1 | 4 | 12.27 | 0.15 to 15.13 |
| Rectal infection: | |||||||
| Chlamydia | 158 | 69% | 252.62 | 10 | 14 | 5.54 | 3.15 to 9.08 |
| Gonorrhoea | 49 | 21% | 80.85 | 4 | 5 | 6.18 | 2.27 to 13.71 |
| Both | 22 | 10% | 34.82 | 1 | 3 | 8.62 | 2.19 to 23.45 |
| Early syphilis concurrently or in last 2 years: | |||||||
| Yes | 31 | 14% | 50.33 | 3 | 4 | 7.95 | 2.52 to 19.17 |
| No | 198 | 86% | 317.96 | 12 | 18 | 5.66 | 3.46 to 8.77 |