pISSN 2234-7518
eISSN 2005-372X

Table. 3.

The absolute values of error, distribution of error, accuracy percentage, and degree of accuracy for each landmark

Compartment Land-mark Absolute value of error (Err) Distribution Accuracy
Mean ± SD (mm) Excellent
(Err <1.0 mm)
Good
(1.0 ≤ Err < 1.5 mm)
Fair
(1.5 ≤ Err < 2.0 mm)
Acceptable
(2.0 ≤ Err < 2.5 mm)
Unacceptable
(2.5 mm ≤ Err)
Accuracy percentage Degree of accuracy
Skeletal landmark Cranial base Nasion 0.59 ± 0.48 157 (85.3) 18 (9.8) 4 (2.2) 3 (1.6) 2 (1.1) 175 (95.1) Very high
Sella 0.46 ± 0.23 180 (97.8) 4 (2.2) 0 (0.0) 0 (0.0) 0 (0.0) 184 (100) Very high
Porion 1.07 ± 0.69 103 (56.0) 37 (20.1) 24 (13.0) 14 (7.6) 6 (3.3) 140 (76.1) High
Orbitale 1.21 ± 1.01 92 (50.0) 44 (23.9) 21 (11.4) 12 (6.5) 15 (8.2) 136 (73.9) High
Basion 1.64 ± 1.61 82 (44.6) 34 (18.5) 21 (11.4) 13 (7.1) 34 (18.5) 116 (63.1) Medium
Maxilla Anterior ANS 1.39 ± 1.01 72 (39.1) 48 (26.1) 23 (12.5) 14 (7.6) 27 (14.7) 120 (65.2) Medium
A point 1.41 ± 0.99 86 (46.7) 30 (16.3) 22 (12.0) 18 (9.8) 28 (15.2) 116 (63.0) Medium
Posterior PNS 1.19 ± 0.89 97 (52.7) 37 (20.1) 24 (13.0) 13 (7.1) 13 (7.1) 134 (72.7) High
Mandible Anterior B point 1.15 ± 0.96 106 (57.6) 36 (19.6) 21 (11.4) 8 (4.3) 13 (7.1) 142 (77.2) High
Pogonion 0.79 ± 0.68 140 (76.1) 28 (15.2) 7(3.8) 1 (0.5) 8 (4.3) 168 (91.3) Very high
Bottom Menton 0.77 ± 0.44 143 (77.7) 29 (15.8) 8 (4.3) 3 (1.6) 1 (0.5) 172 (93.5) Very high
Posterior Articulare 0.77 ± 0.45 138 (75.0) 34 (18.5) 10 (5.4) 1 (0.5) 1 (0.5) 172 (93.5) Very high
Dental landmark Maxillary dentition Anterior Mx1C 0.44 ± 0.37 178 (96.7) 2 (1.1) 2 (1.1) 1 (0.5) 1 (0.5) 180 (97.8) Very high
Mx1R 1.55 ± 1.09 63 (34.2) 43 (23.4) 36 (19.6) 12 (6.5) 30 (16.3) 106 (57.6) Medium
Posterior Mx6D 1.43 ± 1.08 76 (41.3) 42 (22.8) 23 (12.5) 17 (9.2) 26 (14.1) 118 (64.1) Medium
Mx6R 1.68 ± 1.08 51 (27.7) 44 (23.9) 35 (19.0) 19 (10.3) 35 (19.0) 95 (51.6) Medium
Mandibular dentition Anterior Md1C 0.49 ± 0.64 172 (93.5) 7 (3.8) 0 (0.0) 2 (1.1) 3 (1.6) 179 (97.3) Very high
Md1R 1.57 ± 1.04 64 (34.8) 43 (23.4) 29 (15.8) 18 (9.8) 30 (16.3) 107 (58.2) Medium
Posterior Md6D 1.67 ± 1.24 54 (29.3) 41 (22.3) 33 (17.9) 30 (16.3) 26 (14.1) 95 (51.6) Medium
Md6R 2.03 ± 1.35 46 (25.0) 30 (16.3) 25 (13.6) 28 (15.2) 55 (29.9) 76 (41.3) Low
Total 1.17 ± 1.04 2,100 (57.1) 631 (17.1) 368 (10.0) 227 (6.2) 354 (9.6) 2,731 (74.2) High

Values are presented as number (%).

Err, absolute value of error; SD, standard deviation; Accuracy percentage (AP); error range within 1.5 mm was considered accurate.

The degree of accuracy was defined as very high (90% ≤ AP), high (70% ≤ AP < 90%), medium (50% ≤ AP < 70%), and low (AP < 50%).

See Table 2 for definitions of each landmark.

Korean J Orthod 2022;52:287~297 https://doi.org/10.4041/kjod21.248
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