Table 4.
Comparison of methods (controls).
| Method 1 | Method 2 | N | ICC | Difference | Student's t-test | Wilcoxon | CV (%) | Bland-Altman |
|---|---|---|---|---|---|---|---|---|
| (ICC*) | P value | P value | r (P value) | |||||
| T1–T4 | ||||||||
| Known volume | VIZ3D samp. | 4 | 0.999 (0.968) | −8.00 ± 5.77 | 0.070 | 0.13 | 2.63 | Pearson: 0.84 (0.16) |
| Spearman: 0.80 (0.20) | ||||||||
| Known volume | Archimedes' samp. | 4 | 0.999 (0.982) | −1.25 ± 13.1 | 0.86 | 0.99 | 3.23 | Pearson: −0.10 (0.90) |
| Spearman: 0.20 (0.80) | ||||||||
| Known volume | CT scan samp. | 4 | 0.999 (0.994) | −3.75 ± 7.76 | 0.41 | 0.50 | 2.16 | Pearson: −0.899 (0.10) |
| Spearman: −0.80 (0.20) | ||||||||
| VIZ3D samp. | Archimedes' samp. | 4 | 0.997 (0.982) | 6.75 ± 13.0 | 0.38 | 0.50 | 3.65 | Pearson:−0.47 (0.53) |
| Spearman: −0.40 (0.60) | ||||||||
| VIZ3D samp. | CT scan samp | 4 | 0.998 (0.986) | 4.25 ± 12.4 | 0.54 | 0.63 | 3.18 | Pearson: −0.956 (0.044) |
| Spearman: −1.00 (<0.0001) | ||||||||
| Archimedes' samp. | CT scan samp | 4 | 0.997 (0.973) | −2.50 ± 16.5 | 0.78 | 0.88 | 4.06 | Pearson: −0.34 (0.66) |
| Spearman: −0.20 (0.80) |
Using these controls we compared one with another using our three methods of study and we found good concordances and relatively low coefficients of variation.