Before

Control (控制组)

43.131

Treated (实验组)

1343.454

Diff (T-C)

1300.323

297.029

4.378

0.000^**

After

Control (控制组)

318.227

Treated (实验组)

1804.165

Diff (T-C)

1485.938

348.297

4.266

0.000^**

Diff-in-Diff

185.615

315.047

0.589

0.560