| Variable | Sample | Treated | Controls | Difference | S.E. | T-stat | 
| sf | Unmatched | 82.54 | 80.18 | 2.36 | 1.44 | 1.63 | 
| 
 | ATT | 83.55 | 79.36 | 4.19 | 2.23 | 1.87 | 
| 
 | ATU | 80.16 | 84.21 | 4.05 | . | . | 
| 
 | ATE | 
 | 
 | 4.12 | . | . |