Table 5.
Results of multivariable regression analyses of total house-dust PAH concentrations using the optimal variable set selected with deletion-substitution-addition algorithm.
| Parameter | Model 1; All homes, imputed values (N=583) |
Model 2; HVS3-sampled homes, imputed values (N=417) |
Model 3; All homes, no imputed values (N=307) |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate | SE | 95% CI | Partial R2 | Estimate | SE | 95% CI | Partial R2 | Estimate | SE | 95% CI | Partial R2 | |
| Intercept | 5.43 | 0.11 | (5.22, 5.64) | – | 5.16 | 0.16 | (4.85, 5.47) | – | 5.51 | 0.14 | (5.24, 5.78) | – |
| Residence age, decade | 0.21 | 0.05 | (0.11, 0.30) | 0.07 | 0.26 | 0.06 | (0.14, 0.38) | 0.07 | 0.24 | 0.06 | (0.13, 0.35) | 0.09 |
| ln(Outdoor PAH estimate, ng/m3) | 0.22 | 0.07 | (0.08, 0.36) | 0.02 | 0.28 | 0.07 | (0.14, 0.41) | 0.02 | 0.16 | 0.07 | (0.02, 0.30) | 0.01 |
| Gas heating | 0.16 | 0.06 | (0.04, 0.29) | 0.02 | 0.18 | 0.07 | (0.04, 0.33) | 0.02 | 0.20 | 0.08 | (0.04, 0.36) | 0.04 |
| Residence is apartment/townhouse | 0.18 | 0.08 | (0.02, 0.33) | 0.01 | 0.12 | 0.09 | (−0.07, 0.30) | 0.01 | −0.13 | 0.11 | (−0.35, 0.08) | 0.002 |
| Child’s age at enrollment, years | 0.04 | 0.02 | (0.01, 0.07) | 0.01 | 0.04 | 0.02 | (0.00, 0.08) | 0.01 | 0.03 | 0.02 | (−0.01, 0.07) | 0.01 |
| Mother’s ethnicity is Hispanic | −0.12 | 0.06 | (−0.24, 0.01) | 0.002 | −0.10 | 0.08 | (−0.24, 0.05) | 0.001 | −0.09 | 0.08 | (−0.25, 0.07) | 0.003 |
| (Residence age)2 | −0.02 | 0.01 | (−0.03, −0.01) | 0.02 | −0.02 | 0.01 | (−0.04, −0.01) | 0.03 | −0.02 | 0.01 | (−0.04, −0.01) | 0.03 |
| (ln(Outdoor PAH estimate, ng/m3))2 | −0.05 | 0.02 | (−0.09, −0.01) | 0.01 | 0.06 | 0.03 | (0.00, 0.12) | 0.02 | −0.03 | 0.02 | (−0.07, 0.01) | 0.005 |
| Size of sampling area, m2 | – | – | – | – | −0.06 | 0.02 | (−0.10, −0.02) | 0.01 | – | – | – | – |
PAH, polycyclic aromatic hydrocarbon.