Descriptive statistics for children's health and human capital.

Note: All outcome variables are standardized to mean zero and variance one. A lower value corresponds to a better outcome. The lower number of observations for grades appears because not all children are enrolled in school and not all school-age children receive grades. P-values stem from two-sided t-tests comparing the means for children doing and not doing sports in a club. Descriptive statistics of the unstandardized variables can be found in S6 Table.