Table 4.

Univariate analysis of the potential risk factors for CIN. (n=1036, 410 women with CIN lesions and 626 women without CIN lesion)

Variable	Β	S.E.	Wald		OR (95% CI)	P
Age(years)
56-65					1.000
46-55	-0.405	0.172	6.724		0.667 (0.491-0.909)	0.010
36-45	-0.434	0.156	6.408		0.648(0.463-0.907)	0.011
≤35	-0.262	0.225	1.360		0.769(0.496-1.195)	0.24
Education level
Senior middle school or above					1.000
Junior middle school or below	0.309	0.128	5.789		1.362 (1.059-1.752)	0.016
Occupation
Farmer					1.000
Worker	-0.429	0.225	3.619		0.651 (0.418-1.013)	0.057
Medical, scientific, educational staff	-0.473	0.193	5.999		0.623 (0.427-0.910)	0.014
Other	-0.264	0.148	3.165		0.768 (0.574-1.027)	0.057
Husband's occupation
Farmer					1.000
Factory worker	-0.272	0.165	2.706		0.762 (0.551-1.053)	0.100
Medical, scientific, educational staff	-0.474	0.205	5.347		0.623 (0.417-0.931)	0.021
Other	-0.076	0.160	0.227		0.927 (0.677-1.268)	0.634
Washing the vulva after sexual intercourse
Yes					1.000
No	0.445	0.158	7.92		1.56 (1.144-2.129)	0.005
Tubal ligation for contraception
No					1.000
Yes	0.295	0.126	5.529		1.343 (1.050-1.719)	0.019
Duration after tubal ligation
≥30 years					1.000
<30 years	-0.288	0.134	4.625		0.749 (0.576-0.974)	0.032
Average daily dietary folate intake (μg)	-0.001	0.000	8.763		0.999 (0.998-1)	0.003

OR, odds ratio; CI, confidence interval; CIN, cervical intraepithelial neoplasia.