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Comparison of diagnostic efficacy of three diagnostic schemes.
| Diagnostic program | N | Sensitivity (%) | Specificity (%) | Positive predictive value (%) | Negative predictive value (%) | Youden index |
|---|---|---|---|---|---|---|
| Color Doppler ultrasound | 64 | 78.13 | 81.25 | 80.65 | 78.79 | 0.59 |
| Magnetic resonance imaging | 64 | 93.75 | 87.50 | 88.24 | 93.33 | 0.81 |
| Color Doppler ultrasound combined with magnetic resonance imaging | 64 | 100.00 | 100.00 | 100.00 | 100.00 | 1.00 |
| χ 2 | 7.905 | 8.847 | 9.011 | 7.905 | 9.250 | |
| P | 0.005 | 0.001 | 0.000 | 0.005 | 0.000 |
