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).

	HPV-16 seropositive		HPV-18 seropositive		HPV-31 seropositive
	# (%)	OR (95% CI)	# (%)	OR (95% CI)	# (%)	OR (95% CI)
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)