Bone Texture Fractal Dimension Analysis of Ultrasound-Treated Bone around Implant Site: A Double-Blind Clinical Trial

Table 7

Validity parameters for FD-mesial and FD-distal sides when used as a test to predict high implant stability (ISQ ≥ 70).

Positive if ≥ cutoff value	k	Specificity	Accuracy	PPV at pretest probability = 50%	NPV at pretest probability = 10%
FD-mesial
1.505 (highest sensitivity and optimum cutoff value)	100.0	86.5	96.2	88.1	100.0
1.516	92.9	86.5	91.1	87.3	99.1
1.653	50.0	98.1	63.7	96.3	94.6
1.667 (highest specificity)	50.0	100.0	64.3	100.0	94.7
FD-distal
1.313 (highest sensitivity)	100.0	23.1	78.0	56.5	100.0
1.315	92.9	25.0	73.5	55.3	96.9
1.419	78.6	96.2	83.6	95.3	97.6
1.440 (optimum cutoff value)	78.6	98.1	84.1	97.6	97.6
1.481	42.9	98.1	58.6	95.7	93.9
1.492 (highest specificity)	42.9	100.0	59.2	100.0	94.0