Table 3.

Odds ratios and 95% confidence interval of breast cancer associated with viral hepatitis by age

Viral hepatitis B & C	Age < 50 years				Age ≥ 50 years
	Cases	Controls	ORa	(95% CI)	Cases	Controls	ORa	(95% CI)
No	910	3722	1.00	(reference)	850	3380	1.00	(reference)
HCV	24	48	2.03	(1.23-3.34)*	32	130	1.00	(0.67-1.49)
HBV	72	267	1.10	(0.84-1.45)	51	213	0.97	(0.71-1.33)
HBV + HCV	10	27	1.59	(0.77-3.31)	9	45	0.83	(0.40-1.71)

^aAdjusted for area, occupation, urbanization, and income

*p < 0.01 based on Wald tests