Table 4.
Descriptive statistics and 95% CIs for mean simple errors calculated as semidigital (landmarking on paper but calculations by computer) minus fully digital (both landmarking and measurements done manually on the computer). The p values are calculated once by comparing the mean errors with zero and, if significant, then once more by comparing them with 1/100 of the means of gold standard tracing values. All measurements were significantly smaller than 2 (all p values < 0.0005). The number of samples per row is 101 (n = 101).
| Measurement | Mean | SD | Min | Q1 | Med | Q3 | Max | 95% CI | P 0 | P g o l d/100 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| N-A-Pog | 0.004 | 0.696 | −1.433 | −0.627 | 0.091 | 0.555 | 1.600 | −0.133 | 0.142 | 0.949 | — |
| Facial angle | 0.016 | 0.360 | −0.967 | −0.185 | 0.025 | 0.281 | 0.960 | −0.055 | 0.087 | 0.652 | — |
| A-B plane | 0.073 | 0.627 | −1.009 | −0.412 | 0.059 | 0.615 | 1.422 | −0.051 | 0.197 | 0.245 | — |
| MP angle | 0.034 | 0.414 | −1.001 | −0.273 | 0.029 | 0.334 | 1.160 | −0.048 | 0.116 | 0.410 | — |
| NSG | −0.031 | 0.362 | −0.828 | −0.287 | −0.039 | 0.220 | 0.871 | −0.102 | 0.040 | 0.392 | — |
| OP cant | 0.069 | 0.657 | −1.352 | −0.328 | 0.095 | 0.508 | 1.729 | −0.061 | 0.199 | 0.294 | — |
| Interincisal angle | 0.350 | 1.231 | −3.439 | −0.278 | 0.388 | 1.207 | 3.023 | 0.107 | 0.593 | 0.005 | < 0.00000005 |
| L1 ^ OP | −0.189 | 1.148 | −2.723 | −0.957 | −0.370 | 0.424 | 4.188 | −0.416 | 0.038 | 0.101 | — |
| L1 ^ MP | 0.158 | 1.070 | −3.829 | −0.412 | 0.209 | 0.874 | 2.286 | −0.053 | 0.369 | 0.141 | — |
| U1 protrusion | 0.702 | 0.436 | −0.443 | 0.427 | 0.704 | 1.012 | 1.683 | 0.616 | 0.788 | < 0.00000005 | < 0.00000005 |
| SNA | −0.039 | 0.514 | −1.290 | −0.466 | −0.018 | 0.248 | 1.153 | −0.141 | 0.063 | 0.448 | — |
| SNB | −0.031 | 0.403 | −1.039 | −0.326 | −0.073 | 0.215 | 0.804 | −0.111 | 0.048 | 0.440 | — |
| ANB | 0.008 | 0.351 | −0.767 | −0.273 | 0.046 | 0.275 | 0.636 | −0.061 | 0.077 | 0.822 | — |
| OP-S-N | 0.119 | 0.641 | −1.508 | −0.181 | 0.114 | 0.579 | 1.764 | −0.008 | 0.245 | 0.065 | — |
| MP-S-N | 0.088 | 0.458 | −0.995 | −0.265 | 0.110 | 0.365 | 1.358 | −0.003 | 0.178 | 0.057 | — |
| U1-N-A | −0.241 | 0.964 | −2.538 | −0.953 | −0.310 | 0.317 | 1.962 | −0.431 | −0.051 | 0.014 | 0.0000046 |
| L1-N-B | −0.101 | 1.075 | −2.535 | −0.769 | −0.152 | 0.492 | 3.705 | −0.314 | 0.111 | 0.346 | — |
Note: The reference values for comparisons for the second p value column are as follows: −0.055, 0.878, −0.064, 0.246, 1.100, 0.079, 1.263, 1.136, 0.834, 0.053, 0.796, 0.763, −0.034, 0.181, 0.351, 0.224, and 0.280, respectively, for N-A-Pog, facial angle, A-B plane, MP angle, NSG, the cant of OP, interincisal angle, L1 ^ OP, L1 ^ MP, U1 protrusion, SNA, SNB, ANB, OP-S-N, MP-S-N, U1-N-A, and L1-N-B.
Abbreviations: CI, confidence interval based on the t distribution; Max, maximum; Med, median; Min, minimum; OP, occlusal plane; Q1, first quartile; Q3, third quartile; SD, standard deviation.