| 变量代码 | 样本量 | 平均值 | 标准差 | 最小值 | 最大值 |
| ROA | 30,980 | 0.038 | 0.206 | −14.586 | 20.788 |
| Salary 2 | 30,362 | 0.018 | 0.148 | 0.000 | 12.313 |
| Salary | 30,362 | 0.081 | 0.105 | 0.000 | 3.509 |
| Firmage | 30,858 | 2.775 | 0.411 | 0.000 | 3.970 |
| Staff | 30,979 | 0.076 | 0.013 | 0.007 | 0.132 |
| Duality | 30,980 | 0.273 | 0.446 | 0.000 | 1.000 |
| Boardnum | 30,980 | 10.148 | 2.691 | 4.000 | 31.000 |
| Inboardr | 30,980 | 0.381 | 0.073 | 0.167 | 0.800 |
| Tmtnum | 30,980 | 0.072 | 0.028 | 0.010 | 0.430 |
| Tenure | 30,979 | 0.525 | 0.417 | 0.000 | 2.490 |
| Boardnum | 30,980 | 2.294 | 2.105 | 0.000 | 13.000 |
| Hhi | 30,979 | 3.436 | 1.506 | 0.029 | 8.999 |
| Assetlr | 30,980 | 0.452 | 1.162 | −0.195 | 178.345 |
| Private | 30,980 | 0.963 | 0.122 | 0.078 | 1.000 |