Table 1.
Non parametric MANCOVA on accuracy measurements (deviation between structures) performed with different settings, cleaning status, and measurement time points.
| Factor | d.f. | F | P |
|---|---|---|---|
| Covariate (patient) | 1 | 31.293 | 0.000* |
| Superimposition | 2 | 18.269 | 0.000* |
| Setting | 1 | 0.712 | 0.396 |
| Cleaning | 1 | 0.001 | 0.981 |
| Time | 1 | 0.017 | 0.897 |
| Superimposition x Setting | 2 | 0.347 | 0.703 |
| Superimpostion x Cleaning | 2 | 0.035 | 0.967 |
| Superimposition x Time | 2 | 0.005 | 0.994 |
| Setting x Cleaning | 1 | 0.014 | 0.908 |
| Setting x Time | 1 | 0.000 | 0.993 |
| Cleaning x Time | 1 | 0.001 | 0.971 |
| Superimposition x Setting x Cleaning | 2 | 0.069 | 0.934 |
| Superimposition x Setting x Time | 2 | 0.027 | 0.973 |
| Superimposition x Cleaning x Time | 2 | 0.019 | 0.981 |
| Setting x Cleaning x Time | 1 | 0.021 | 0.885 |
| Superimposition x Setting x Cleaning x Time | 2 | 0.005 | 0.995 |
| Residual | 215 | ||
| Total | 239 | ||
| Comparison a | t | p – value | |
| A vs. B | 1.232 | 0.218 | |
| A vs. C | 5.913 | 0.000* | |
| B vs. C | 5.128 | 0.000* |
Four crossed factors and their interactions were analyzed in each case having “patient” as a covariate: superimposition technique (fixed factor; 3 techniques), setting (fixed factor; 2 settings), cleaning (fixed factor; 2 status), and time (fixed factor; 2 measurement time points).
9999 permutations.
*p < 0.05.
aa posteriori pairwise tests between superimposition techniques.
A, B, C correspond to the three superimposition techniques and reference areas tested in the study.