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Table 4 Validity of MRI and NIRS in evaluation of low-grade cartilage lesions

From: Near-infrared (NIR) spectroscopy. A new method for arthroscopic evaluation of low grade degenerated cartilage lesions. Results of a pilot study

  MRI NIRS
Correctly positive test 19 20
Correctly negative test 15 27
False positive test 13 1
False negative test 1 0
Sensitivity 0.950 1.000
Specificity 0.536 0.964
Positive predictive value 0.678 0.714
Negative predictive value 0.937 1.000
Likelihood ratio positive test 2.05 27.7
Likelihood ratio negative test 0.093
Accuracy 0.708 0.979