Table 5.

Standardised incidence ratios (SIRs) for primary liver and gall bladder cancer in offspring by parental concordant site and by liver and biliary cancer

		Primary liver				Gall bladder
Parental cancer	Histology in offspring	O	SIR	95%CI		O	SIR	95%CI
Primary liver	Hepatocellular carcinoma	5	4.69	1.48	11.04	0
Liver and biliary	Hepatocellular carcinoma	7	2.50	0.99	5.19	0
Gall bladder	Adenocarcinoma	0				7	5.21	2.07	10.80
Liver and biliary	Adenocarcinoma	0				10	3.28	1.56	6.06

Values in bold type indicate that 95% confidence interval (95% CI) does not include 1.00.

O, observed.