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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 C2.

Baseline Interaction Controlling for Non-Linear Effects of Birth Weight: Quadratic

Dependent Variable: High School IQ
(1) (2) (3)
Neuroplasticity Genes 0.4423 (0.4344) 0.3691 (0.4322) −0.0627 (0.7926)
Standardized Birth Weight 5.0424*** (1.9317) 5.3704*** (1.8856) 5.7055** (2.6344)
Standardized Birth Weight Sqr. −0.1074 (0.1951) −0.0690 (0.2256) −0.1761 (0.2472)
G × E −0.8377** (0.4208) −0.9231** (0.4158) −0.9680* (0.5570)
Controls
 Demographic and Family SES Y Y Y
 Sibling Fixed Effects N N Y
Estimation
 Weighting by Prob. of Being in Sib Sample N Y N
N 938 938 938
R Sqr. 0.1368 0.1335 0.6981

Notes: (i) Neuroplasticity Genes is the additive genetic risk score of plastic alleles for APOE, BDNF, and COMT. G × E represents the interaction between our measure of neuroplasticity and standardized birth weight. (ii) Demographic and family controls include race, sex, birth year (age), birth order, mother’s education, father’s education, and a score for family SES in 1957. (vi) Standard errors are clustered at the family level with *, **, and *** representing significance at the 10, 5, and 1% significance level, respectively.