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Table 2 Sensitivity, specificity, PPV, NPV, and accuracy of the six indices

From: Impact of a combination of quantitative indices representing uptake intensity, shape, and asymmetry in DAT SPECT using machine learning: comparison of different volume of interest settings

  Sensitivity (%) Specificity (%) PPV (%) NPV (%) Accuracy (%)
SBR-Q 94.4 (67/71) 92.5 (37/40) 95.7 (67/70) 90.2 (37/41) 93.7 (104/111)
SBR-V 78.9 (56/71) 85.0 (34/40) 90.3 (56/62) 69.4 (34/49) 81.1 (90/111)
PCR-Q 80.3 (57/71) 87.5 (35/40) 91.9 (57/62) 71.4 (35/49) 82.9 (92/111)
FD-V 90.1 (64/71) 97.5 (39/40) 98.5 (64/65) 84.8 (39/46) 92.8 (103/111)
AI-Q 71.8 (51/71) 85.0 (34/40) 89.5 (51/57) 63.0 (34/54) 76.6 (85/111)
AI-V 73.2 (52/71) 85.0 (34/40) 89.7 (52/58) 64.2 (34/53) 77.5 (86/111)
  1. Abbreviations: PPV positive predictive value, NPV negative predictive value, SBR specific binding ratio, PCR putamen-to-caudate ratio, FD fractal dimension, AI asymmetry index