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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