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Table 4 OLS of the effect of birth weight (categorical variable) 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*
 High birth weight 0.0516 7.81 0.2025 2.35
 Low birth weight -0.0263 -2.26 -0.0743 -0.91
 Log of household income -0.0212 -7.85 -0.0197 -6.72
 High birth weight X income    -0.0153 -1.78
 Low birth weight X income    0.0051 0.61
LR test of basic model vs. model with interaction    p = 0.06
Sibling sample**
 High birth weight 0.0458 5.69 0.2293 2.14
 Low birth weight -0.0222 -1.48 -0.0807 -0.8
 Log of household income -0.0218 -6.26 -0.0199 -5.25
 High birth weight X income    -0.0187 -1.75
 Low birth weight X income    0.0062 0.6
LR test of basic model vs. model with interaction a    p = 0.05
  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