Hepatitis B or C viral infection and the risk of cervical cancer

Table 1 Characteristics of study population

Variable	Cases		Controls		P
	(n = 838)		(n = 838)
	No	%	No	%
Age, years					0.834
< 40	248	29.6	237	28.3
40–60	527	62.9	538	64.2
> 60	63	7.5	63	7.5
Ethnicity					0.276
Han	703	83.9	719	85.8
Non-Han	135	16.1	119	14.2
Place of birth					0.440
Yunnan and neighboring province^a	819	97.7	814	97.1
Other provinces in China	19	2.3	24	2.9

ISSN: 1750-9378