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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