| Model | Classification | N | Percentage % |
| 1st Model (6 extra negative items) | Not IER | 232 | 92.80% |
| IER | 18 | 7.20% | |
| Total | 250 | 100.00% | |
| Model 2 (4 extra negative items) | Not IER | 231 | 92.40% |
| IER | 19 | 7.60% | |
| Total | 250 | 100% | |
| Model 3 (2 extra negative items) | Not IER | 211 | 84.40% |
| IER | 39 | 15.60% | |
| Total | 250 | 100% |