Table 4 The ROC curve analysis results of RPRV and SFR.

From: The impact of the ratio of renal parenchyma to renal volume on stone-free rates after RIRS: a retrospective study

  

Cut-off value

AUC

sensitivity

specificity

Youden index

95% CI

P value

Overall sample

Renal volume

157.6575

0.477

0.847

0.235

0.082

0.358–0.596

0.7

Renal parenchymal volume

145.4800

0.571

0.576

0.618

0.194

0.450–0.691

0.230

RPRV

0.6890

0.678

0.953

0.412

0.365

0.562–0.794

0.002*

2–2.9 cm

Renal volume

194.4900

0.454

0.533

0.529

0.062

0.289–0.618

0.575

Renal parenchymal volume

145.6175

0.625

0.622

0.706

0.328

0.459–0.791

0.132

RPRV

0.6887

0.769

0.978

0.588

0.566

0.607–0.930

0.001*

3–4 cm

Renal volume

157.8025

0.499

0.875

0.294

0.169

0.324–0.673

0.986

Renal parenchymal volume

110.8875

0.493

0.925

0.235

0.160

0.320–0.666

0.931

RPRV

0.8034

0.572

0.350

0.882

0.232

0.408–0.736

0.393

  1. *P < 0.05.
  2. RPRV, ratio of renal parenchymal volume to renal volume.