| Variables | (1) | (2) | (3) | (4) |
| Small board size | Big board size | Short tenure | Long tenure | |
| Culture | −0.094** | −0.223*** | −0.054 | −0.202*** |
| (−2.395) | (−4.295) | (−1.158) | (−4.963) | |
| size | 0.358*** | 0.389*** | 0.367*** | 0.379*** |
| (47.313) | (37.944) | (41.949) | (45.417) | |
| debt | −0.082 | −0.156** | −0.033 | −0.178*** |
| (−1.581) | (−2.253) | (−0.557) | (−3.056) | |
| roa | 0.090 | −0.573** | −0.258 | −0.045 |
| (0.501) | (−2.397) | (−1.163) | (−0.244) | |
| caset2 | −0.090 | −0.111 | −0.211*** | 0.007 |
| (−1.570) | (−1.245) | (−2.980) | (0.111) | |
| loss | 0.061* | 0.049 | 0.019 | 0.112*** |
| (1.828) | (1.163) | (0.489) | (3.117) | |
| listtime | 0.002 | −0.000 | −0.028 | 0.033 |
| (0.144) | (−0.003) | (−1.617) | (1.489) | |
| ownership | −0.047*** | −0.032 | −0.047** | −0.046*** |
| (−2.956) | (−1.468) | (−2.467) | (−2.662) | |
| Big4/big5 | 0.642*** | 0.558*** | 0.603*** | 0.605*** |
| (15.396) | (12.723) | (13.510) | (15.353) | |
| audittenure | 0.033*** | −0.050*** | 0.012 | −0.013 |
| (2.758) | (−3.253) | (0.893) | (−0.992) | |
| autype | −0.128*** | −0.140** | −0.115** | −0.150*** |
| (−2.946) | (−2.460) | (−2.405) | (−3.020) | |
| age | 29.158 | −4.728 | −5.218 | 35.533* |
| (1.615) | (−0.199) | (−0.257) | (1.763) | |
| tenure | −0.019 | 0.040* | ||
| (−1.237) | (1.893) | |||
| Constant | −108.161 | 23.688 | 26.013 | −133.481* |
| (−1.535) | (0.255) | (0.328) | (−1.696) | |
| Year | Yes | Yes | Yes | Yes |
| Industry | Yes | Yes | Yes | Yes |
| Adj.−R2 | 0.599 | 0.670 | 0.626 | 0.617 |
| N | 3509 | 2021 | 2821 | 2709 |
| Chi2 | 3.88** | 5.37** | ||