| Variable | High-income countries | Middle-income country | Low-income countries |
| Gn | −0.03 | 0.121 | 0.009*** |
|
| (0.020) | (0.068) | (0.013) |
| Gg | −1.343*** | −3.804** | −1.106*** |
|
| (0.411) | (1.636) | (0.270) |
| Gl | 0.018 | 0.898** | 0.037 |
|
| (0.041) | (0.409) | (0.062) |
| Gt | −0.066*** | 0.027 | 0.031 |
|
| (0.014) | (0.039) | (0.026) |
| R2 | 0.6031 | 0.6371 | 0.6089 |
| F | 17.23 | 8.02 | 10.37 |