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

Table 4 The subgroup analyses for patients aged younger than 50 years: univariable and multivariable logistic regression analyses

Variable	Cases		Controls		Univariable			Multivariable
	(n = 620)		(n = 616)		Univariable			Multivariable
	No	%	No	%	OR	95%CI	P	AOR	95%CI	P
HBV infection status
HBsAg-negative/anti-HBc-negative^a	502	81	543	88		1(reference)			1(reference)
HBsAg-positive/anti-HBc-positive^b	73	12	27	4.4	1.7	1.1–2.9	0.03	2.1	1.0–4.4	0.046
HBsAg-negative/anti-HBc-positive^c	43	6.9	46	7.5	1.7	1.2–2.6	0.005	1.5	0.8–2.8	0.194

P-values in bold denoted statistical significance for P ＜0.05
HBV, hepatitis B virus; HBsAg, hepatitis B surface antigen; anti-HBc, hepatitis B core antibody; OR, odds ratio; AOR, adjusted odds ratio; CI: confidence interval. Multivariate analyses were adjusted by age (as a continous variable), ethnicity (Han/non-Han), birth of place (Yunnan and neighboring province/Other provinces in China), HPV (negative/positive), and No.full-term pregnancies(0/1/2/3/ > 3)
^aNever exposed
^bChronic carrier of HBV
^cPast exposure to HBV

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