Table 3.

Structural equations modeling (SEM) results.

Variables	Model 1 (1989–2002)			Model 2 (1989–1998)			Model 3 (1989–2002)
	Slope coefficient	t-Valuea	Standardized coefficient	Slope coefficient	t-Valuea	Standardized coefficient	Slope coefficient	t-Valuea	Standardized coefficient
UPtot (Equation 4)
ln(UPd)	0.1347	8.43	0.2575	0.1466	7.95	0.2762	0.1360	8.50	0.2598
ln(DUSTage0–1)	0.0450	2.80	0.0132	0.0440	2.24	0.0116	0.0450	2.79	0.0132
ln(DUSTage1–2)	0.0501	4.06	0.0273	0.0613	6.23	0.0333	0.0667	7.45	0.0363
ln(DUST1994–1998)	0.0336	1.95	0.0128	—	—	—	—	—	—
ln(UPys)	0.0611	6.09	0.1027	0.0516	4.82	0.0866	0.0601	5.99	0.1010
ln(UPns)	0.0647	3.30	0.1364	0.0661	2.41	0.1396	0.0636	3.24	0.1341
ln(UPcs)	0.1594	6.03	0.3439	0.0954	2.75	0.2050	0.1571	5.94	0.3389
Intercept	0.3639	3.34	0.1316	0.7666	5.55	0.2670	0.3820	3.52	0.1382
Error	—	—	0.2098	—	—	0.2021	—	—	0.2100
Bioavailable dust lead (Equation 5)
ln(UPys)	0.1039	7.57	0.0914	0.1054	7.31	0.0938	0.1039	7.57	0.0914
ln(UPns)	0.0751	2.77	0.0828	0.1126	3.01	0.1262	0.0751	2.77	0.0828
ln(UPcs)	0.3350	9.35	0.3782	0.2582	5.50	0.2944	0.3350	9.35	0.3782
Intercept	2.3390	16.52	0.4418	2.5994	14.67	0.4804	2.3339	16.52	0.4418
Error	—	—	0.1523	—	—	0.1468	—	—	0.1523
Baseline bioavailable lead (μg/dL)	1.4			2.2			1.5
Baseline bioavailable dust lead (mg/kg)	37.0			48.1			36.9
n	2,034			1,571			2,034
Goodness of fit index	0.9995			0.9999			0.9998
χ2	4.7284			0.598			1.5347
Degrees of freedom	3			2			2
Pr > χ2	0.1928			0.7416			0.4642
r2 Total uptake	0.9560			0.9591			0.9559
r2 Bioavailable dust lead	0.9768			0.9785			0.9768
Abbreviations: χ2, chi-square; cs, community soil; d, dust; DUSTage0–1, bioavailable dust lead if the child was 6–11 months; DUSTage1–2, bioavailable dust lead if the child was 12–23 months; DUST1994–1998, bioavailable dust lead if the year was 1994, 1995, 1996, 1997, or 1998. ln, natural log; ns, neighborhood soil; Pr, probability; r2, r-squared; tot, total; UP, uptake; ys, yard soil. at-Values ≥ 1.96 are equivalent to p-values < 0.05.