Table A1.
Descriptive statistics of matching covariates.
| Girls |
Boys |
|||
|---|---|---|---|---|
| Mean or % | SD | Mean or % | SD | |
| Age (years) | 12.56 | 1.74 | 12.57 | 1.71 |
| Father's education (years) | 6.94 | 4.32 | 6.95 | 4.16 |
| Mother's education (years) | 5.32 | 4.64 | 5.16 | 4.42 |
| Had brother(s) (%) | 58.63 | ― | 33.28 | ― |
| Had sister(s) (%) | 40.11 | ― | 45.23 | ― |
| Paternal grandparent(s) alive (%) | 86.03 | ― | 86.91 | ― |
| Maternal grandparent(s) alive (%) | 90.66 | ― | 88.93 | ― |
| Born in a hospital (%) | 46.78 | ― | 50.00 | ― |
| Ever attended kindergarten (%) | 56.75 | ― | 59.77 | ― |
| % Agricultural population in the county | 0.72 | 0.27 | 0.72 | 0.27 |
| Place of birth (%) | ||||
| North | 10.68 | ― | 9.69 | ― |
| Northeast | 9.73 | ― | 9.77 | ― |
| East | 10.36 | ― | 11.39 | ― |
| Central | 18.60 | ― | 19.39 | ― |
| South | 16.17 | ― | 16.64 | ― |
| Southwest | 14.68 | ― | 16.32 | ― |
| Northwest | 19.78 | ― | 16.80 | ― |
| N prior to matching | 1,274 | 1,238 | ||