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Table 2 OLS of the effect of birth weight in kilos (continuous) and income on obesity in the full sample and the sibling sample

From: Variation in the relationship between birth weight and subsequent obesity by household income

  No interactions (Eq. 1/Eq. 3) With interactions (Eq. 2/Eq. 4)
  Coef. t Coef. t
Full sample*
 Birth weight 0.0403 9.81 0.1273 3.04
 Log of household income -0.0220 -8.11 0.0078 0.56
 Birth weight X income    -0.0089 -2.13
LR test of basic model vs. model with interaction    p = 0.01
Sibling sample*
 Birth weight 0.0353 6.77 0.1503 2.76
 Log of household income -0.0227 -6.51 0.0170 0.94
 Birth weight X income    -0.0118 -2.17
LR test of basic model vs. model with interaction    p = 0.01
Sibling fixed effects**
 Birth weight 0.0434 5.64 0.1874 2.34
 Log of household income [equal across siblings] [equal across siblings]
 Birth weight X income    -0.0148 -1.8
LR test of basic model vs. model with interaction    p < 0.01
  1. * Covariates: age; sex; interactions between age and sex; ethnicity; Government Office Region (GOR) of residence; survey year; birth order; maternal age at delivery; and, whether or not the child was born prematurely
  2. ** Covariates: birth order; maternal age at delivery; whether or not the child was born prematurely; and, the child’s age interacted with gender