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. Author manuscript; available in PMC: 2016 May 1.
Published in final edited form as: J Health Econ. 2015 Feb 21;41:107–116. doi: 10.1016/j.jhealeco.2015.01.005

Table A6.

Summary Statistics: Siblings with Discordant Environment (Birth Weight)

Siblings Pair Sample:
Base (1) Concordant (2) Discordant (3)
IQ 104.19 (14.82) 104.16 (15.34) 104.19 (14.81)
Birth Weight (in grams) 3367.55
631.85		 3626.16 (628.58) 3354.82 (629.62)
Neuroplasticity Genes (Count) 4.35 (1.06) 4.47 (0.0.85) 4.34 (1.07)
N 938 44 894

Notes: This table separates the base sibling sample by differences in sibling birth weight. Column (1) gives our base sample; column (2) considers only siblings that have identical birth weights; and column (3) gives sample statistics for siblings who differ in birth weight.