Table 2

 Comparison of incidence rates (a) by age period according to sex and (b) by sex according to age period

Incidence rate ratio (95% CI)Adjusted incidence rate ratio (95% CI)*
*Adjusted for number of sexual partners and same sex contact
Comparison by age periods according to sex
Men
    First coitus to age 26ReferenceReference
    Age 26–32 years2.2 (1.3 to 3.6)2.9 (1.7 to 4.9)
Women
    First coitus to age 26 yearsReferenceReference
    Age 26–32 years1.1 (0.73 to 1.7)2.0 (1.2 to 3.4)
Comparison by sex according to age periods
First coitus to age 26 years
    MenReferenceReference
    Women2.2 (1.4 to 3.4)2.5 (1.6 to 4.0)
Age 26–32 years
    MenReferenceReference
    Women1.1 (0.69 to 1.8)1.3 (0.78 to 2.2)