Table 3.

Parameter estimates (standard errors) for arsenic (As) and lead (Pb) emitting TRI facilities categorized by amount of on-site releases (below or at/above the median) and direction, distance, or direction/distance combined (with respect to US Census 2000 block group from facility) and maternal race in As and Pb best fit models.

	As modelsa		Pb modelsb
	Distance and/or direction	Maternal race	Distance and/or direction	Maternal race
Direction only
SW	0.32 (0.25)	0.13 (0.04)**	−18.5 (3.6)**	2.1 (0.6)**
NE	−0.96 (0.24)**	0.13 (0.04)**	−31.9 (3.5)**	2.2 (0.6)**
Distance only
≤5 km	−2.4 (0.71)**	0.14 (0.04)**	−12.4 (3.8)**	2.1 (0.6)**
6–10 km	−0.71 (0.49)	0.14 (0.04)**	21.2 (3.8)**	2.1 (0.6)**
11–20 km	0.01 (0.31)	0.13 (0.04)**	10.5 (3.6)**	2.1 (0.6)**
>20 km	0.36 (0.28)	0.14 (0.04)**	−8.6 (3.6)**	2.0 (0.6)**
Direction/distance combined
SW, ≤5 km	−0.6 (2.0)	0.13 (0.04)**	−11.3 (4.4)**	2.1 (0.6)**
SW, 6–10 km	0.15 (0.88)	0.13 (0.04)**	4.3 (3.7)	2.1 (0.6)**
SW, 11–20 km	0.33 (0.41)	0.13 (0.04)**	23.5 (3.7)**	2.1 (0.6)**
SW, >20 km	0.09 (0.25)	0.13 (0.04)**	−9.6 (3.6)**	2.1 (0.6)**
NE, ≤5 km	−3.7 (1.0)**	0.14 (0.04)**	−20.1 (9.4)**	2.1 (0.6)**
NE, 6–10 km	−1.5 (0.71)**	0.14 (0.04)**	−6.2 (4.0)	2.1 (0.6)**
NE, 11–20 km	−0.45 (0.62)	0.13 (0.04)**	2.2 (3.7)	2.1 (0.6)**
NE, >20 km	−0.89 (0.24)**	0.13 (0.04)**	−26.6 (3.7)**	2.1 (0.6)**

^aAs models additionally adjusted for maternal education, block group year home built category, and block group road density; parameter estimate are for mothers living within that direction, distance, or direction/distance combined category of TRI facilities with on-site releases at or above the median for As

^bPb models additionally adjusted for block group year home built category and road density; parameter estimate are for mothers living within that direction, distance, or direction/distance combined category of TRI facilities with on-site releases at or above the median for Pb

^**Denotes significant estimate (p<0.05)