Table 4 Final logistic regression model demonstrating association between number of lifetime sexual partners, age at first sexual intercourse, smoking, OC use and HPV-16, -18, and -31 seropositivity, also adjusted for age and recent sexual partners (excluding study virgins)

Age

 <25

166 (15.7)

—

134 (12.7)

—

179 (16.9)

—

 25–29

182 (14.2)

0.9 (0.7–1.1)

176 (13.7)

1.1 (0.8–1.4)

235 (18.3)

1.1 (0.9–1.4)

 30–44

657 (18.4)

1.1 (0.9–1.4)

645 (18.1)

1.4 (1.2–1.7)

667 (18.7)

1.1 (0.9–1.3)

 45–64

361 (15.0)

0.9 (0.7–1.2)

402 (16.7)

1.3 (1.0–1.7)

369 (15.3)

0.8 (0.7–1.0)

 65+

143 (13.7)

0.9 (0.7–1.2)

157 (15.0)

1.3 (0.9–1.7)

152 (14.6)

0.8 (0.6–1.1)

Lifetime number of sexual partners

 1 (referent)

537 (10.6)

—

557 (11.0)

—

646 (12.8)

—

 2–3

654 (20.3)

2.1 (1.8–2.3)

660 (20.5)

2.0 (1.7–2.2)

656 (20.4)

1.7 (1.5–1.9)

 4+

318 (28.9)

3.1 (2.6–3.7)

297 (27.0)

2.6 (2.2–3.1)

300 (27.2)

2.3 (2.0–2.8)

Number of recent sexual partners

 0

297 (16.0)

—

315 (17.0)

—

305 (16.4)

—

 1

1153 (15.8)

0.9 (0.8–1.1)

1134 (15.6)

0.9 (0.8–1.1)

1235 (16.9)

0.9 (0.8–1.1)

 2+

58 (26.9)

0.9 (0.6–1.3)

65 (30.1)

1.3 (0.9–1.8)

60 (27.8)

1.0 (0.7–1.5)

Age at first intercourse

 <16 (referent)

415 (21.1)

—

419 (21.4)

—

403 (20.5)

—

 16–19

726 (15.7)

0.8 (0.7–1.0)

718 (15.5)

0.8 (0.7–0.9)

816 (17.6)

1.0 (0.8–1.1)

 20+

367 (13.3)

0.8 (0.7–1.0)

376 (13.6)

0.8 (0.6–0.9)

382 (13.8)

0.8 (0.7–1.0)

Smoking

 Never (referent)

1285 (15.5)

—

1304 (15.7)

—

1380 (16.6)

—

 Former

111 (19.6)

1.2 (0.9–1.4)

105 (18.5)

1.0 (0.8–1.3)

114 (20.1)

1.2 (0.9–1.5)

 Current

113 (22.9)

1.2 (1.0–1.5)

103 (20.9)

1.1 (0.8–1.3)

107 (21.7)

1.1 (0.9–1.4)

Oral contraceptive use

 Never (referent)

511 (13.9)

—

553 (15.1)

—

570 (15.5)

—

 Former

671 (17.0)

1.3 (1.1–1.5)

683 (17.4)

1.2 (1.0–1.4)

708 (18.0)

1.1 (1.0–1.3)

 Current

326 (18.5)

1.5 (1.2–1.8)

277 (15.7)

1.2 (1.0–1.4)

324 (18.4)

1.1 (0.9–1.3)