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Table 3 Multi-level multiple regression analysis of determinants of birth weight (as a continuous outcome) (n = 327877)

From: Are there differences in birth weight between neighbourhoods in a Nordic welfare state?

  Model 1 Model 2 Model 3 Model 4 Model 5 Model 6
Intercept 3562.58 3563.328 3624.578 (10.368) 3511.860 (8.732) 3518.116 (8.786) 3519.353 (8.713)
  (2.373) (2.384)     
Year of birth   3.653 (0.363) 3.943 (0.365) 4.076 (0.335) 3.928 (0.336) 1.867 (0.337)
Fixed effects Beta (SE)
Neighbourhood economic status       
   Very high level of resources    - - - -
   High level of resources    -27.806 (10.938) -7.206 (9.202) -5.380 (9.064) -4.193 (9.180)
   Medium to high level of resources    -36.764 (10.850) * -0.982 (9.024) 2.372 (8.890) 6.625 (9.002)
   Medium level of resources    -48.418 (10.776) * -2.295 (8.961) 2.573 (8.837) 10.105 (8.942)
   Medium to low level of resources    -66.231 (10.845) * -8.818 (9.025) -2.862 (8.908) 8.061 (9.006)
   Low level of resources    -91.652 (11.000) * -23.591 (9.148) -14.204 (9.049) -1.210 (9.135)
   Very low level of resources    -138.568 (11.412) * -56.813 (9.494)* -44.187 (9.425)* -33.053 (9.481)*
   Poor    -171.387 (12.845) * -75.971 (10.590)* -62.003 (10.593) * -56.028 (10.587) *
Maternal height     16.068 (0.143) * 15.908 (0.145) * 16.145 (0.144) *
Length of gestation       
   22–28 weeks     -2580.491 (21.378) * -2581.771 (21.616) * -2566.803 (21.657) *
   29–32 weeks     -1813.587 (12.011) * -1815.726 (12.137) * -1796117 (12.190) *
   33–36 weeks     -858.069 (4.653) * -859.875 (4.697) * -851.399 (4.692) *
   37–41 weeks (reference)     - - -
   ≥ 42 weeks     293.570 (8.623) * 294.794 (8.729) * 296.171 (8.700) *
Parity     147.626 (1.801) * 149.529 (1.818) * 150.013 (1.812) *
Maternal education       
   Elementary (reference)      -43.699 (3.246) *  
   Secondary (2 yrs)      -10.525 (2.448) *  
   Secondary (3–4 yrs)      -  
   University      -6.009 (2.929)  
Maternal smoking habits (cig/day)       
   0 (reference)       -
   1–9       -131.976 (3.041) *
   ≥ 10       -199.493 (3.970) *
Random effects Variance components
Intercept variance; individuals 300378.500 300183.600 300270.600 223262.800 223139.700 219758.000
(SE) (744.144) (744.159) (744.340) (587.044) (592.469) (586.149)
Intercept variance;neighbourhood 2498.777 2427.644 827.088 361.735 324.721 347.552
(SE) (189.361) (191.355) (84.832) (49.094) (46.965) (48.430)
Slope variance; year of birth NA 11.007 9.691 8.478 7.598 8.049
(SE)   (3.970) (3.893) (3.282) (3.263) (3.289)
Covariance NA 96.479 16.604 4.691 (9.026) 4.203 (8.796) 7.802 (8.986)
(SE)   (20.631) (13.071)    
ICC 0.83%      
Reduction of neighbourhood intercept variance    66.9% 85.5% 87.0% 86.1%
  1. NA = not applicable, ICC = intra-class correlation; SE = standard error, * = WALD-statistics > 3