Table 3. Detection of cervical HPV DNA according to selected characteristics among 662 women. Shanxi, China, 2004.

		HPV DNA positive
Characteristics	No. of women	No.	%	Age-adjusted OR (95% CI)a
Education
Illiterate or primaryb	247	37	15.0	1
Junior high school	336	51	15.2	1.0 (0.6–1.7)
Senior high school and above	79	10	12.7	0.8 (0.3–1.7)
p for trend=0.64
Age at first sexual intercourse (years)
⩾21b	209	34	16.3	1
19–20	293	47	16.0	0.9 (0.6–1.5)
⩽18	160	17	10.6	0.5 (0.2–1.0)
p for trend=0.08
Lifetime number of sexual partners
1b	545	85	15.6	1
⩾2	117	13	11.1	0.7 (0.3–1.2)
Husband's extramarital sexual relationships
Nob	583	88	15.1	1
Yes	79	10	12.7	0.8 (0.4–1.7)
Age at menarche (years)
⩽14b	235	36	15.3	1
15–16	225	32	14.2	0.7 (0.4–1.2)
⩾17	202	30	14.9	0.7 (0.4–1.2)
p for trend=0.18
Menopausal statusc
Premenopauseb	90	18	20.0	1
Menopause <50 years old	106	17	16.0	0.7 (0.3–1.7)
Menopause ⩾50 years old	72	8	11.1	0.5 (0.2–1.3)
No. of births
0	15	1	6.7	0.7 (0.1–5.7)
1b	154	16	10.4	1
2	336	54	16.1	1.3 (0.6–2.7)
⩾3	157	27	17.2	1.5 (0.6–3.7)
p for trend=0.31
Intrauterine device use
Neverb	308	44	14.3	1
Ever	354	54	15.3	1.1 (0.7–1.7)
Tubal ligation
Nob	284	33	11.6	1
Yes	378	65	17.2	1.4 (0.8–2.3)

^aAdjusted for age (10-year groups);

^bReference category;

^cWomen ⩾45 years only (n=268). OR=odds ratio; CI=confidence interval.