Table 3. Mean differences, standard deviation and correlation coefficient (intraexaminer error) for repeated measurements of conventional and digital tracing.
| Measurements | Conventional tracing |
Digital tracing |
||
| Difference (mean ± SD) | Correlation coefficient* | Difference (mean ± SD) | Correlation coefficient* | |
| Angular (°) | ||||
| SNA | −0.03 ± 0.7 | 0.98 | 0.6 ± 1.6 | 0.93 |
| SNB | −0.4 ± 1.2 | 0.94 | 0.1 ± 0.9 | 0.97 |
| ANB | 0.4 ± 1.4 | 0.92 | 0.5 ± 1.3 | 0.91 |
| Angle of convexity | −0.04 ± 0.7 | 0.99 | −0.0007 ± 1.1 | 0.99 |
| SN-MP | −0.2 ± 0.8 | 0.99 | 0.07 ± 0.5 | 0.99 |
| SN-PP | 0.7 ± 0.9 | 0.98 | −0.6 ± 1.3 | 0.96 |
| PP-MP | −0.3 ± 0.8 | 0.99 | 0.01 ± 0.4 | 0.99 |
| Gonial angle | −0.1 ± 0.7 | 0.99 | 0.007 ± 0.4 | 0.99 |
| 1/-SN | −0.2 ± 0.9 | 0.99 | −0.1 ± 0.9 | 0.99 |
| /1-MP | 0.4 ± 1.3 | 0.99 | −0.2 ± 0.8 | 0.99 |
| Linear (mm) | ||||
| Anterior cranial base (N-S) | 0.3 ± 0.9 | 0.97 | −0.1 ± 0.7 | 0.98 |
| Mandibular length (Go-Gn) | −1.3 ± 1.6 | 0.94 | 1.7 ± 1.9 | 0.94 |
| Maxillary length (ANS-PNS) | 0.6 ± 2.5 | 0.82 | −1 ± 2.1 | 0.91 |
| Co-ANS | 1.3 ± 1.5 | 0.96 | −0.8 ± 1.3 | 0.96 |
| Co-Gn | 0.6 ± 1.2 | 0.98 | −0.7 ± 1.0 | 0.99 |
| LAFH (ANS-Me) | 0.1 ± 0.7 | 0.99 | −0.4 ± 1.3 | 0.98 |
ANS, anterior nasal spine; Co, condylion; Gn, gnathion; Go, gonion; LAFH, lower anterior facial height; Me, menton; MP, mandibular plane; N, nasion; PNS, posterior nasal spine; PP, palatal plane; S, sella; SD, standard deviation
* Pearson's correlation coefficient (r2): r2 > 0.8 = strong; 0.5 ≤ r2 ≤ 0.80 = moderate; r2 < 0.5 = weak