Noninferiority and Equivalence Evaluation of Clinical Performance among Computed Radiography, Film, and Digitized Film for Telemammography Services
Table 3
Mean values for the calculated variables by device.
Variable
Device
Mean
SE
95% confidence interval
Lower
Upper
TN
CR
0.47
0.05
0.36
0.57
ICR
0.47
0.05
0.36
0.57
LUMIX
0.46
0.05
0.36
0.57
FILM
0.48
0.06
0.37
0.59
TP
CR
0.32
0.05
0.23
0.42
ICR
0.30
0.05
0.21
0.39
LUMIX
0.32
0.05
0.22
0.41
FILM
0.35
0.05
0.25
0.45
FN
CR
0.15
0.03
0.08
0.21
ICR
0.17
0.04
0.10
0.24
LUMIX
0.16
0.03
0.09
0.22
FILM
0.12
0.03
0.06
0.18
FP
CR
0.06
0.02
0.03
0.09
ICR
0.06
0.02
0.03
0.09
LUMIX
0.07
0.02
0.03
0.10
FILM
0.05
0.02
0.02
0.08
Accuracy
CR
0.79
0.03
0.73
0.86
ICR
0.77
0.04
0.70
0.84
LUMIX
0.78
0.03
0.72
0.84
FILM
0.82
0.03
0.76
0.89
PPV
CR
0.68
0.06
0.57
0.79
ICR
0.68
0.06
0.56
0.79
LUMIX
0.67
0.06
0.56
0.79
FILM
0.68
0.06
0.57
0.79
Sensitivity
CR
0.69
0.06
0.58
0.80
ICR
0.64
0.06
0.52
0.76
LUMIX
0.67
0.05
0.57
0.77
FILM
0.74
0.06
0.63
0.84
Specificity
CR
0.88
0.03
0.83
0.94
ICR
0.88
0.03
0.83
0.94
LUMIX
0.87
0.03
0.82
0.93
FILM
0.90
0.03
0.85
0.96
AUC
CR
0.89
0.04
0.81
0.97
ICR
0.87
0.05
0.77
0.96
LUMIX
0.88
0.04
0.80
0.96
FILM
0.90
0.02
0.87
0.94
Each mean was calculated from 490 observations (70 cases and seven radiologists). TN: true negative proportion, TP: true positive proportion, FN: false negative proportion, FP: false positive proportion, PPV: positive predictive value, ROC: receiver operating characteristic, AUC: area under ROC curve, SE: standard error of the mean.
