Table 2.
Kappa statistics of agreement of measurement results on success/failure of tooth segmentation.
| Segmentation type | First | Kappa | p value | ||||
|---|---|---|---|---|---|---|---|
| Success | Failure | Total | |||||
| LS | Second | Success | 271 (100.0%) | 0 (0.0%) | 271 (96.8%) | 1.000 | < 0.0001 |
| Failure | 0 (0.0%) | 9 (100.0%) | 9 (3.2%) | ||||
| Total | 271 (100.0%) | 9 (100.0%) | 280 (100.0%) | ||||
| DS | Second | Success | 244 (99.6%) | 0 (0.0%) | 244 (87.1%) | 0.984 | < 0.0001 |
| Failure | 1 (0.4%) | 35 (100.0%) | 36 (12.9%) | ||||
| Total | 245 (100.0%) | 35 (100.0%) | 280 (100.0%) | ||||
| AS | Second | Success | 270 (99.3%) | 0 (0.0%) | 270 (96.4%) | 0.885 | < 0.0001 |
| Failure | 2 (0.7%) | 8 (100.0%) | 10 (3.6%) | ||||
| Total | 272 (100.0%) | 8 (100.0%) | 280 (100.0%) | ||||
Success and failure of segmentation, presented as nominal variables using Cohen's kappa, indicated very high evaluation reproducibility from 0.885 to 1.000.
Kappa values were interpreted as follows: poor, < 0.0; slight, 0.0 to 0.2; fair, 0.2 to 0.4; moderate, 0.4 to 0.6; substantial, 0.6 to 0.8, and almost perfect, 0.8 to 1.0.