| Firm | Mean | Std.Dev. | Minimum | Maximum |
| Hokkaido | 0.926 | 0.049 | 0.814 | 0.982 |
| Tohoku | 0.901 | 0.061 | 0.777 | 0.983 |
| Tokyo | 0.922 | 0.038 | 0.82 | 0.974 |
| Chubu | 0.937 | 0.024 | 0.863 | 0.978 |
| Hokuriku | 0.937 | 0.035 | 0.812 | 0.980 |
| Kansai | 0.927 | 0.036 | 0.829 | 0.979 |
| Chugoku | 0.910 | 0.055 | 0.769 | 0.980 |
| Shikoku | 0.908 | 0.040 | 0.790 | 0.974 |
| Kyushu | 0.935 | 0.042 | 0.772 | 0.977 |
| All | 0.923 | 0.045 | 0.769 | 0.983 |