Diagnostic Accuracy of Periapical Radiography in Detection and Measurement of the External Root Resorption in Primary Molars: A Single-Blind Prospective Clinical Study
Table 4
Descriptive statistics and 95% CIs for the extents of the directionless absolute error (mm) observed by each of the radiograph assessors in the case of each of the actual resorption extents (mm).
Absolute error (mm)
AR (mm)
N
Mean
SD
95% CI
Min
Max
Observer 1
0
62
1.61
1.74
1.17
2.05
0.0
5.0
1
2
0.50
0.71
−5.85
6.85
0.0
1.0
2
14
1.71
1.33
0.95
2.48
0.0
5.0
3
6
2.33
1.21
1.06
3.60
1.0
4.0
4
9
1.56
1.67
0.27
2.84
0.0
4.0
5
13
1.31
1.65
0.31
2.31
0.0
4.0
6
4
2.00
1.41
−0.25
4.25
1.0
4.0
7
24
1.21
1.41
0.61
1.81
0.0
4.0
8
1
8.00
10
1
3.00
Total
136
1.60
1.67
1.32
1.89
0.0
8.0
Observer 2
0
44
1.77
1.75
1.24
2.30
0.0
6.0
1
2
1.50
0.71
−4.85
7.85
1.0
2.0
2
13
2.00
1.29
1.22
2.78
0.0
5.0
3
5
1.80
0.84
0.76
2.84
1.0
3.0
4
8
1.38
1.30
0.29
2.46
0.0
4.0
5
10
1.90
1.73
0.66
3.14
0.0
5.0
6
4
2.25
1.89
−0.76
5.26
1.0
5.0
7
16
2.06
1.57
1.23
2.90
0.0
5.0
10
1
9.00
Total
103
1.91
1.70
1.58
2.25
0.0
9.0
Average absolute error of both observers
0
44
1.76
1.58
1.28
2.24
0.0
5.5
1
2
1.00
0.71
−5.35
7.35
0.5
1.5
2
13
1.85
1.21
1.11
2.58
0.5
5.0
3
5
2.00
1.00
0.76
3.24
1.0
3.0
4
8
1.56
1.37
0.41
2.71
0.0
4.0
5
10
1.65
1.63
0.48
2.82
0.0
4.0
6
4
2.13
1.60
−0.42
4.67
1.0
4.5
7
16
1.72
1.34
1.00
2.43
0.0
4.0
10
1
6.00
Total
103
1.79
1.47
1.50
2.08
0.0
6.0
AR, actual resorption; SD, standard deviation; CI, confidence intervals; min, minimum; max, maximum.
