Figure 1
From: Risk factors for HPV infection and high-grade cervical disease in sexually active Japanese women
(A) Comparison between age-groups of mean age at sexual debut in women who first had sex as a teenage (n = 2329) Mean age at first intercourse was significantly earlier in group A (16.8 ± 1.5), compared to groups B (17.2 ± 1.4) and C (17.9 ± 1.2) (p < 0.01). (B) Correlation between multiple number of lifetime sexual partners and lower age at first intercourse (n = 3231). There was a significant correlation between lifetime number of sexual partners and lower age at first intercourse (p < 0.01, polyserial correlation = 0.55).
