Table 5.

Results of multivariate analysis of the potential risk factors for CIN

Variable	B	S.E.	Wald		OR (95% CI)	P value
Age (years)
56-65	-0.407				1.000
46-55	-0.487	0.160	6.475		0.666(0.486-0.910)	0.011
36-45	-0.264	0.177	7.543		0.614(0.434-0.870)	0.006
≤35		0.231	1.300		0.768(0.488-1.209)	0.254
Husband's occupation
Farmer	-0.236				1.000
Factory worker	-0.475	0.172	1.895		0.789(0.564-1.105)	0.514
Medical, scientific, educational staff	-0.108	0.212	5.005		0.621(0.410-0.943)	0.025
Other		0.166	0.426		0.898(0.648-1.242)	0.169
Washing the vulva after sexual intercourse
Yes	0.605				1.000
No	-0.001	0.166	13.349		1.831(1.324-2.535)	<0.001
Average daily dietary folate intake (μg)		0.000	10.012		0.999(0.998-0.999)	<0.001

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

N=1036 including 410 women with CIN lesions and 626 women without CIN lesion.