Recent papers indicate that children who are relatively old-for-grade have a significantly lower incidence of ADHD diagnosis. We find that this is not the case in Denmark, suggesting that diagnoses are less subjective in a regime where only specialists diagnose.

We investigate pre-teenage effects of type of non-parental child care at age three (preschool versus more informal family day care) on overall and risky behavior and objective and self-evaluated abilities. We find no strong evidence that one type of non-parental care outperforms the other,...