Table 4 Calculated most accurate threshold ratio via Youden-Index.

From: Plain radiographic indices are reliable indicators for quantitative bone mineral density in male and female patients before total hip arthroplasty

Index

Osteopenia

Osteoporosis

Ratio

Sens

Spec

YI

Ratio

Sens

Spec

YI

CBR-7

Total

0.5105

0.782

0.767

0.549

0.5465

0.789

0.797

0.586

CBR-10

0.4755

0.759

0.783

0.542

0.5350

0.789

0.868

0.657

CCR

0.5320

0.494

0.667

0.161

0.5545

0.632

0.726

0.357

CFI

3.1710

0.540

0.853

0.393

3.1075

0.789

0.782

0.571

CBR-7

Male

0.4885

0.774

0.697

0.472

0.5115

1.000

0.650

0.650

CBR-10

0.4725

0.645

0.724

0.369

0.5020

0.500

0.786

0.286

CCR

0.7015

0.129

0.987

0.116

0.5655

0.500

0.728

0.228

CFI

3.1710

0.484

0.816

0.300

2.9725

0.500

0.825

0.325

CBR-7

Female

0.5120

0.839

0.830

0.669

0.5465

0.933

0.766

0.699

CBR-10

0.4755

0.857

0.811

0.668

0.5350

0.933

0.830

0.763

CCR

0.5480

0.464

0.811

0.276

0.5875

0.533

0.904

0.438

CFI

3.3055

0.696

0.811

0.508

3.1075

0.867

0.798

0.665

  1. Sens. Sensitivity, Spec. Specificity, YI Youden-Index, CCR Canal-Calcar-Ratio, CFI Canal-Flare-Index, CBR-7 Canal-Bone-Ratio at 7 cm, CBR-10 Canal-Bone-Ratio at 10 cm.
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