Table 2.
Generalized linear (“mixed”) model results testing change in child BLLs over time.
| MODEL | Information Criteria (smaller is better) |
Type III Tests of Fixed Effects |
Estimates of Fixed Effects |
Estimates of Covariance Parameters |
|---|---|---|---|---|
| Baseline Intercept Only BLL Variability |
-2 Log Likelihood 753.30 Akaike’s Information Criterion (AIC) 759.30 |
Intercept F = 45.32 df= 1/56, p < 0.001 |
Intercept est. 3.52 SE = 0.52 95% CI (2.47/ 4.57) t = 6.73, df= 56, p < 0.001 |
|
| Linear Change Model (Unconditional) Test Wave |
-2 Log Likelihood 723.60 Akaike’s Information Criterion (AIC) 735.60 |
Intercept, F = 26.46 df= 1/44, p < 0.001 Test Wave, F= 9.76 df= 1/25, p = 0.005 |
Intercept est 5.84 SE= 1.14 95% CI (3.56/8.13) t = 5.14 df= 44, p < 0.001 Test Wave est − 1.09 SE= 0.35 95% CI (−1.81/−0.37) t = −3.12 df= 25, p = 0.005 |
Test Wave/Intercept Covariance Parameter est = −7.71 SE= 3.52 95% CI (−14.61/−0.80) Wald Z = −2.19, p = 0.029 |
| Linear Change Model (Conditional) Test Wave AgeGroup HomeAge |
-2 Log Likelihood 710.12 Akaike’s Information Criterion (AIC) 730.12 |
Intercept, F = 27.53 df= 1/82, p < 0.001 Test Wave, F = 7.93 df= 1/32, p = 0.008 AgeGroup, F = 2.30 df= 2/4, p = 0.219 HomeAge F= 4.69 df= 2/3, p = 0.130 |