Table 2.

The 2-year incidence of human papillomavirus (HPV) infection in initially HPV negative women, overall and for specific oncogenic types

HPV type	N	% in total cohort of initially HPV negative women (95% CI) (n=6,246)	% in women who become HPV-positive(95% CI) (n=798)	% acquisition by age group (95% CI)
				20–23 years (n=1,959)	24–26 years (n=2,032)	27–29 years (n=2,255)
Any HR type#	798	12.8 (12.0–13.6)	100.0 -	17.9 (16.2–19.6)	12.3 (10.9–13.7)	8.7 (7.6–9.9)
16	182	2.9 (2.5–3.3)	22.8 (19.9–25.7)	4.2 (3.3–5.1)	2.7 (2.0–3.4)	2.0 (1.5–2.6)
18	73	1.2 (0.9–1.4)	9.2 (7.2–11.2)	2.3 (1.6–2.9)	1.1 (0.7–1.6)	0.3 (0.1–0.5)
31	161	2.6 (2.2–3.0)	20.2 (17.4–23.0)	4.4 (3.5–5.4)	2.3 (1.6–2.9)	1.2 (0.8–1.7)
33	113	1.8 (1.5–2.1)	14.2 (11.7–16.6)	2.6 (1.9–3.3)	1.7 (1.1–2.2)	1.3 (0.8–1.8)
35	31	0.5 (0.3–0.7)	3.9 (2.5–5.2)	0.6 (0.3–1.0)	0.5 (0.2–0.8)	0.4 (0.1–0.7)
39	95	1.5 (1.2–1.8)	11.9 (9.7–14.2)	2.1 (1.5–2.8)	1.3 (0.8–1.8)	1.2 (0.7–1.6)
45	101	1.6 (1.3–1.9)	12.7 (10.4–15.0)	1.9 (1.3–2.5)	1.7 (1.2–2.3)	1.3 (0.8–1.8)
51	130	2.1 (1.7–2.4)	16.3 (13.7–18.9)	3.1 (2.3–3.8)	2.2 (1.5–2.8)	1.2 (0.7–1.6)
52	184	3.0 (2.5–3.4)	23.1 (20.1–26.0)	4.2 (3.3–5.1)	2.8 (2.1–3.5)	2.0 (1.4–2.6)
53	80	1.3 (1.0–1.6)	10.0 (7.9–12.1)	2.1 (1.5–2.8)	1.2 (0.8–1.7)	0.6 (0.3–1.0)
56	86	1.4 (1.1–1.7)	10.8 (8.6–12.9)	2.3 (1.6–3.0)	1.0 (0.6–1.4)	0.9 (0.5–1.3)
58	46	0.7 (0.5–1.0)	5.8 (4.2–7.4)	1.1 (0.7–1.6)	0.7 (0.3–1.1)	0.4 (0.2–0.7)
59	32	0.5 (0.3–0.7)	4.0 (2.7–5.4)	0.9 (0.5–1.3)	0.4 (0.2–0.7)	0.3 (0.1–0.5)
66	94	1.5 (1.2–1.8)	11.8 (9.5–14.0)	2.5 (1.8–3.2)	1.2 (0.7–4.7)	0.9 (0.5–1.3)
68	82	1.3 (1.0–1.6)	10.3 (8.2–12.4)	1.6 (1.1–2.2)	1.2 (0.7–1.7)	1.2(0.7–1.6)
Multiple HR types	399	6.4 (5.8–7.0)	50.0 (46.5–53.5)	10.3 (8.9–11.6)	5.9 (4.8–6.9)	3.5 (2.7–4.3)

^#HR=high-risk