Table 3.

Hazard rate ratios (and 95% CIs) for incident venous thromboembolism (VTE) by distance to major roads, ARIC, 1987-2005 (n=13,143)

	Dichotomized at 150m			Dichotomized at 100m			Continuous variable
	< 150 m	>= 150 m	p	< 100 m	>= 100 m	p	Difference between the 90^th and 10^th percentile ^‡	p
No. of cases/subjects	176/5,095	229/8,048		123/3,567	282/9,576
Basic model ^*	1.18 (0.97, 1.44)	1.00	0.10	1.15 (0.93, 1.42)	1.00	0.20	1.19 (0.98, 1.45)	0.09
Adjusted model ^†	1.16 (0.95, 1.42)	1.00	0.14	1.12 (0.90, 1.38)	1.00	0.32	1.18 (0.97, 1.44)	0.10

Covariates included age, sex, center and ethnicity.

^†

Covariates included age, sex, center, ethnicity, BMI, diabetes status, factor VIII, aPTT, active and passive smoking, alcohol intake and background air pollution level.

^‡

10th percentile of distance to major road: 22.5 meters; 90th percentile of distance from the nearest major traffic road: 588.8 meters.