Table 3.

Absolute and relative risks for VTE in relatives dependent on IT

Type of IT	Exposure time, y	Event, n	Annual incidence, % (95% CI)	Hazard ratio,* % (95% CI)	P
AT/PC/PS	463	13	2.82 (1.63-4.80)	25.7 (12.2-54.2)	< .001
FV G1691A	2783	7	0.25 (0.12-0.53)	1.7 (0.7-4.4)	.24
FII G20210A	1192	5	0.42 (0.17-1.01)	2.6 (0.9-7.6)	.09
Combined defects	258	6	2.33 (1.04-5.19)	19.6 (7.7-49.6)	< .01
No IT	13 567	14	0.10 (0.06-0.17)	1	1
Total	18 278	47	0.26 (0.19-0.34)

IT indicates inherited thrombophilia; and VTE, venous thromboembolism.

^*Adjusted for age and sex.