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Table 5 Diagnostic efficacy of ROC curves for 168 lymph nodes with a short-axis diameter equal to or more than 5 mm at the largest Youden index

From: Non-invasive MR assessment of the microstructure and microcirculation in regional lymph nodes for rectal cancer: a study of intravoxel incoherent motion imaging

Parameter AUC(95% CI) Youden index Cutoff value Sensitivity Specificity
D 0.751 (0.679~0.815) 0.415 0.592 × 10−3 mm2/s 85.90% 55.56%
f 0.665 (0.589~0.736) 0.304 0.244 94.87% 35.56%
S 0.670 (0.594~0.741) 0.255 6.510 mm 57.69% 67.78%
L 0.676 (0.599~0.746) 0.303 6.870 mm 76.92% 53.33%
D + f + S 0.811 (0.744~0.868) 0.506 0.555 62.82% 87.78%
  1. Note: ROC receiver operating characteristic, AUC area under curve, S short-axis diameter, L long-axis diameter, D pure diffusion coefficient, D* pseudo-diffusion coefficient, f perfusion factor, D + f + S the multi-parameter model comprising D, f and short-axis diameter