| Matching method | radius match | nuclear matching | 1:4 near-neighbour matching in calipers | average value |
| ATT | −0.0175 | −0.0165 | −0.0175 | −0.0172 |
| S.E. | 0.0041 | 0.0042 | 0.0041 | 0.0041 |
| T-stat | −4.30 | −3.92 | −4.24 | −4.15 |