Diagnostic Accuracy of Periapical Radiography in Detection and Measurement of the External Root Resorption in Primary Molars: A Single-Blind Prospective Clinical Study
Table 2
Descriptive statistics and 95% CIs for the extents of error (mm, calculated as the actual resorption extent minus the radiographic resorption estimate) observed by each of the radiograph evaluators in the case of each of the extents of actual resorption (mm).
Error (mm)
AR (mm)
N
Mean
SD
95% CI
Min
Max
Observer 1
0 mm
62
−1.61
1.74
−2.05
−1.17
−5.0
0.0
1 mm
2
−0.50
0.71
−1.0
0.0
2 mm
14
−0.57
2.14
−1.81
0.66
−5.0
2.0
3 mm
6
0.00
2.83
−2.97
2.97
−4.0
3.0
4 mm
9
0.67
2.24
−1.05
2.39
−3.0
4.0
5 mm
13
1.15
1.77
0.08
2.22
−1.0
4.0
6 mm
4
1.50
2.08
−1.81
4.81
−1.0
4.0
7 mm
24
1.21
1.41
0.61
1.81
0.0
4.0
8 mm
1
8.00
10 mm
1
3.00
Total
136
−0.31
2.30
−0.70
0.08
−5.0
8.0
Observer 2
0 mm
44
−1.77
1.75
−2.30
−1.24
−6.0
0.0
1 mm
2
−1.50
0.71
−2.0
−1.0
2 mm
13
−1.23
2.09
−2.49
0.03
−5.0
2.0
3 mm
5
−0.20
2.17
−2.89
2.49
−2.0
3.0
4 mm
8
0.63
1.85
−0.92
2.17
−1.0
4.0
5 mm
10
1.50
2.12
−0.02
3.02
−1.0
5.0
6 mm
4
2.25
1.89
−0.76
5.26
1.0
5.0
7 mm
16
2.06
1.57
1.23
2.90
0.0
5.0
10 mm
1
9.00
Total
103
−0.26
2.56
−0.76
0.24
−6.0
9.0
Average error of both observers
0 mm
44
−1.76
1.58
−2.24
−1.28
−5.5
0.0
1 mm
2
−1.00
0.71
−1.5
−0.5
2 mm
13
−1.00
2.02
−2.22
0.22
−5.0
2.0
3 mm
5
−0.40
2.41
−3.39
2.59
−3.0
3.0
4 mm
8
0.69
2.03
−1.01
2.39
−2.0
4.0
5 mm
10
1.35
1.76
0.09
2.61
−0.5
4.0
6 mm
4
1.88
1.89
−1.13
4.88
0.0
4.5
7 mm
16
1.72
1.34
1.00
2.43
0.0
4.0
10 mm
1
6.00
Total
103
−0.33
2.29
−0.78
0.11
−5.5
6.0
AR, actual resorption; SD, standard deviation; CI, confidence intervals; min, minimum; max, maximum. Negative errors indicate that the root resorption estimated on radiographs was overestimated and longer than the actual root resorption. Positive errors mean an underestimation of the resorption.
