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Table 4 Random Effects and Model Diagnostics

From: Air pollution, neighbourhood and maternal-level factors modify the effect of smoking on birth weight: a multilevel analysis in British Columbia, Canada

  Null
model
Model 1 Model 2 Model 3
L1 residual (sd) 560.5 554.7 555.0 554.9
L2 intercept (sd) 78.7 83.4 44.4 44.2
L2 slope (sd) 10.7 9.8 9.0
Intercept 3434.3 3505.9 3501.8 3500.9
AIC 602672 598513 596639 596514
L1-PCV Ref. 2.0 % 2.0 % 2.0 %
L2-PCV Ref. -12.3 % 68.2 % 68.5 %
ICC/VPC# 0.019 0.022 0.006 0.006
Int-slope corr. -0.53 -0.28 -0.28
  1. Abbreviations: L1 residual (sd) Level-1 residual standard deviation, L2 intercept (sd) Level-2 random intercept standard deviation, L2 slope (sd) Level-2 random slope standard deviation, PCV proportional change in variance, # VPC (variance partition coefficient) is equivalent to the ICC but conditional on the random-slope variable, thus values in table represent intercepts for non-smoking individuals, Int-slope corr intercept-slope correlation