| Variable | N | Mean | sd | Min | Max |
| Time | 600 | 2009.48 | 5.662423 | 1992 | 2018 |
| Bsize | 600 | 8.028333 | 1.316721 | 5 | 12 |
| ROE | 600 | −0.0367193 | 1.901446 | −45.7368 | 0.5863 |
| naps | 600 | 4.555857 | 2.892336 | −1.6023 | 20.6943 |
| Lev | 600 | 0.4200628 | 0.1915088 | 0.061067 | 1.798856 |
| NOP | 600 | 0.0338211 | 0.446074 | −8.395471 | 2.781976 |