| Clinical Findings | Group I | Group II | Group III | |
| Extent | Localized | 43% | 43% | 40% |
| generalized | 57% | 57% | 60% | |
| Severity | Mild | 14% | 11% | 11% |
| Moderate | 29% | 32% | 29% | |
| Severe | 57% | 57% | 60% | |
| Grade | 1 | 14% | 13% | 12% |
| 2 | 14% | 17% | 18% | |
| 3 | 14% | 17% | 19% | |
| 4 | 30% | 27% | 26% | |
| 5 | 28% | 26% | 25% | |