| Variable | N | Mean | sd | Min | Max |
| Time | 600 | 2004.265 | 7.219532 | 1991 | 2017 |
| Bsize | 600 | 8.398333 | 1.56964 | 4 | 15 |
| ROE | 600 | −0.1180885 | 1.945933 | −45.7368 | 0.4528 |
| naps | 600 | 4.194694 | 3.054705 | −0.7123 | 18.6234 |
| Lev | 600 | 0.4367426 | 0.2085092 | 0.048998 | 1.2369 |
| NOP | 600 | −0.0665274 | 0.6945082 | −8.395471 | 1.340375 |