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Table 2 Overall diagnostic performance and predictive value of US and MRI in evaluating cartilaginous defects

From: A novel ultrasound scanning approach for evaluating femoral cartilage defects of the knee: comparison with routine magnetic resonance imaging

   TP# TN# FP# FN# Sensitivity (95%CI) (%) Specificity (95%CI) (%) Accuracy (95%CI) (%) Crude predictive value (95%CI) (%) Adjusted predictive value (%) AUC (95% CI)
PPV NPV PPV NPV
US Radiologist 1 69 78 6 42 62.2 (53.1–71.2) (0.042) 92.9 (87.3–98.4) (1.000) 75.4 (69.3–81.4) (0.060) 92.0 (85.9–98.1) (0.756) 65.0 (56.5–73.5) (0.148) 90.4 69.5 0.775 (0.722–0.828)
Radiologist 2 77 76 8 34 69.4 (60.8–77.9) (0.367) 90.5 (84.2–96.8) (0.565) 78.5 (72.7–84.2) (0.245) 90.6 (84.4–96.8) (0.397) 69.1 (60.5–77.7) (0.450) 88.7 73.3 0.799 (0.746–0.853)
MRI   84 79 5 27 75.7 (67.7–83.7) 94.0 (89.0–99.1) 83.6 (78.4–88.8) 94.4 (89.6–99.2) 74.5 (66.2–82.8) 93.2 78.2 0.849 (0.801–0.896)
  1. Numbers in parentheses are the P values compared with MRI data
  2. TP true positive, TN true negative, FP false positive, FN false negative
  3. #Data are the surface numbers