Table 1

 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 yearsAge 26–32 years
NumberIncidence rate (95% CI)NumberIncidence rate (95% CI)
HSV-2 +veTotalHSV-2 +veTotal
Men
Total254306.5 (4.2 to 9.6)3338814.3 (9.8 to 20.1)
Number of sexual partners
    0–10360 (0 to 13.1)711410.3 (4.2 to 21.3)
    2–43795.3 (1.1 to 15.5)911713.0 (5.9 to 24.7)
    5–95985.7 (1.9 to 13.3)98118.6 (8.5 to 35.4)
    ⩾10172088.2 (4.8 to 13.1)86819.6 (8.5 to 38.6)
Same-sex contact
    No223896.4 (4.0 to 9.7)2835813.1 (8.7 to 19.0)
    Yes2385.5 (0.67 to 20.1)41936.0 (9.8 to 92.3)
Women
Total5640314.3 (10.8 to 18.5)3133015.8 (10.7 to 22.4)
Number of sexual partners
    0–144710.1 (2.7 to 25.8)91679.0 (4.1 to 17.1)
    2–46877.3 (2.7 to 15.9)129820.7 (10.7 to 36.2)
    5–971027.2 (2.9 to 14.8)43618.5 (5.0 to 47.4)
    ⩾103916223.1 (16.5 to 31.6)62147.6 (17.5 to 103.6)
Same-sex contact
    No5036414.3 (10.6 to 18.9)2730315.0 (9.8 to 21.8)
    Yes63814.4 (5.3 to 31.4)32123.8 (4.9 to 69.6)