Table 2.
Accuracy of cone-beam computed tomography with 0.2 and 0.3 mm3 voxel sizes for the detection of strip perforations of different sizes
| Observer | Perforation size (mm) | Accuracy with 0.2 mm 3 voxel size N (%) | Accuracy with 0.3 mm 3 voxel size N (%) | Odds ratio | 95% CI | P -value |
|---|---|---|---|---|---|---|
| 1 st observer | 0 | 31 (100%) | 31 (100%) | 1 | <0.001 | |
| 0.5 | 16 (51.6%) | 19 (61.3%) | 0.67 | 0.29-1.58 | 0.36 | |
| 1 | 21 (67.7%) | 19 (61.3%) | 1.33 | 0.51-3.45 | 0.56 | |
| 1.5 | 15 (48.4%) | 10 (32.3%) | 1.97 | 0.77-5.07 | 0.16 | |
| 2 | 18 (58.1%) | 18 (58.1%) | 1.00 | 0.53-1.89 | 1.00 | |
| 2 nd observer | 0 | 31 (100%) | 31 (100%) | 1.00 | <0.001 | |
| 0.5 | 18 (58.1%) | 13 (41.9%) | 1.92 | 0.77-4.75 | 0.16 | |
| 1 | 20 (64.5%) | 25 (80.6%) | 0.44 | 0.15-1.27 | 0.13 | |
| 1.5 | 15 (48.4%) | 11 (35.5%) | 1.70 | 0.70-4.18 | 0.24 | |
| 2 | 21 (67.7%) | 21 (67.7%) | 1.00 | 0.29-3.41 | 1.00 | |
| Mean of observers | 0 | 31 (100%) | 31 (100%) | 1 | <0.001 | |
| 0.5 | 17 (54.8%) | 19 (61.3%) | 0.77 | 0.31-1.88 | 0.56 | |
| 1 | 22 (71.0%) | 23 (74.2%) | 0.85 | 0.30-2.44 | 0.76 | |
| 1.5 | 15 (48.4%) | 8 (25.8%) | 2.70 | 0.93-7.77 | 0.07 | |
| 2 | 17 (54.8%) | 17 (54.8%) | 1.00 | 0.49-2.06 | 1.00 |
CI: Confidence interval