Table C3.
Baseline Interaction Controlling for Non-Linear Effects of Birth Weight: Cubic
| Dependent Variable: High School IQ
| |||
|---|---|---|---|
| (1) | (2) | (3) | |
| Neuroplasticity Genes | 0.4326 (0.4355) | 0.3630 (0.4340) | −0.0384 (0.7944) |
| Standardized Birth Weight | 5.0404***(1.9320) | 5.3534***(1.8891) | 5.7081** (2.6276) |
| Standardized Birth Weight Sqr. | −0.1390 (0.2398) | −0.0844 (0.2563) | −0.1225 (0.3034) |
| Standardized Birth Weight Cubed | 0.0205 (0.0489) | 0.0143 (0.0559) | −0.0336 (0.0647) |
| G × E | −0.8640** (0.4285) | −0.9377** (0.4195) | −0.9193 (0.5709) |
| 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. | 0.1369 | 0.1335 | 0.6982 |
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% signifcance level, respectively.