Table 4.

Relative risk and 95% CI of ABO blood types in the cohort by sex

Sex	Blood group	Person-years	Liver cancer (n)	Incidence (1/105)	Relative risk	95% CI
Male	A	5194.72	70	1347.52	1.00
	B	5506.60	67	1216.72	0.90	0.65 to 1.27
	O	5386.50	71	1318.11	0.98	0.70 to 1.36
	AB	1929.03	29	1503.35	1.11	0.72 to 1.72
Female	A	6137.24	34	553.99	1.00
	B	5346.23	30	561.14	1.01	0.62 to 1.66
	O	5842.61	24	410.78	0.74	0.44 to 1.25
	AB	1729.17	11	636.14	1.15	0.58 to 2.27
Total	A	11 331.96	104	917.76	1.00
	B	10 852.83	97	893.78	0.97	0.74 to 1.29
	O	11 229.11	95	846.02	0.92	0.70 to 1.22
	AB	3658.20	40	1093.43	1.19	0.82 to 1.72