Relationship between herpes simplex virus type 2 (HSV-2) incidence rate (per 1000 person-years) and the number of sexual partners and same-sex contact in the period from first coitus to age 26 years, and from age 26–32 years
| First coitus to age 26 years | Age 26–32 years | |||||
|---|---|---|---|---|---|---|
| Number | Incidence rate (95% CI) | Number | Incidence rate (95% CI) | |||
| HSV-2 +ve | Total | HSV-2 +ve | Total | |||
| Men | ||||||
| Total | 25 | 430 | 6.5 (4.2 to 9.6) | 33 | 388 | 14.3 (9.8 to 20.1) |
| Number of sexual partners | ||||||
| 0–1 | 0 | 36 | 0 (0 to 13.1) | 7 | 114 | 10.3 (4.2 to 21.3) |
| 2–4 | 3 | 79 | 5.3 (1.1 to 15.5) | 9 | 117 | 13.0 (5.9 to 24.7) |
| 5–9 | 5 | 98 | 5.7 (1.9 to 13.3) | 9 | 81 | 18.6 (8.5 to 35.4) |
| ⩾10 | 17 | 208 | 8.2 (4.8 to 13.1) | 8 | 68 | 19.6 (8.5 to 38.6) |
| Same-sex contact | ||||||
| No | 22 | 389 | 6.4 (4.0 to 9.7) | 28 | 358 | 13.1 (8.7 to 19.0) |
| Yes | 2 | 38 | 5.5 (0.67 to 20.1) | 4 | 19 | 36.0 (9.8 to 92.3) |
| Women | ||||||
| Total | 56 | 403 | 14.3 (10.8 to 18.5) | 31 | 330 | 15.8 (10.7 to 22.4) |
| Number of sexual partners | ||||||
| 0–1 | 4 | 47 | 10.1 (2.7 to 25.8) | 9 | 167 | 9.0 (4.1 to 17.1) |
| 2–4 | 6 | 87 | 7.3 (2.7 to 15.9) | 12 | 98 | 20.7 (10.7 to 36.2) |
| 5–9 | 7 | 102 | 7.2 (2.9 to 14.8) | 4 | 36 | 18.5 (5.0 to 47.4) |
| ⩾10 | 39 | 162 | 23.1 (16.5 to 31.6) | 6 | 21 | 47.6 (17.5 to 103.6) |
| Same-sex contact | ||||||
| No | 50 | 364 | 14.3 (10.6 to 18.9) | 27 | 303 | 15.0 (9.8 to 21.8) |
| Yes | 6 | 38 | 14.4 (5.3 to 31.4) | 3 | 21 | 23.8 (4.9 to 69.6) |