| Predictor | Model 1 | Model 2 | Model 3 |
| Age | −0.02 | −0.01 | 0.00 |
| Male | −0.07 | −0.08* | −0.08* |
| Educational attainment | 0.01 | 0.00 | −0.00 |
| Paternal educational attainment | 0.13** | 0.07 | 0.09 |
| Maternal educational attainment | 0.12* | −0.01 | 0.01 |
| Household income |
| 0.26*** | 0.21*** |
| District GDP |
| 0.01 | −0.01 |
| Household income × district GDP |
|
| 0.17*** |
| R2 | 0.06 | 0.09 | 0.12 |
| ΔR2 | 0.06 | 0.03 | 0.03 |