In additional analyses in Add Health, we predicted an augmented version of the Peabody Picture Vocabulary test, measured when participants were 12–20 years old. Peabody scores were age-standardized. We also predicted a number of Grade Point Average variables (range: 0.0 to 4.0) from the third wave of Add Health, when transcripts were collected from respondents’ high schools. We analyzed Overall GPA, Math GPA, Science GPA, and Verbal GPA, controlling for high school fixed effects.
