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Table 1 Summary statistics of the estimation samples

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

  Full Sibling
Total (N) 31,043 19,460
Male (N) 15,718 9,806
Female (N) 15,325 9,654
Birth weight (mean) 3.34 3.35
Obese (%) 11.2 10.5
Age (mean) 9.0 9.1
Maternal age at birth (mean) 28.9 28.7
Preterm birth (%) 5.0 5.6
LN household income (mean) 9.8 9.8
Survey year (%)
 2000 1.09 1.10
 2001 7.70 7.79
 2002 16.93 17.80
 2004 3.16 3.19
 2005 6.13 6.20
 2006 0.32 0.37
 2007 15.86 15.78
 2008 15.41 15.36
 2009 8.37 8.24
 2010 11.17 10.86
 2011 3.29 3.06
 2012 3.40 3.53
 2013 3.73 3.43
 2014 3.46 3.29