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Table 2 Both observers' diagnostic values of MRI for each grade of cartilage degeneration and 95% confidence intervals considering arthroscopy as reference standard.

From: Arthroscopy vs. MRI for a detailed assessment of cartilage disease in osteoarthritis: diagnostic value of MRI in clinical practice

  grade I grade II grade III grade IV
True Positive Findings 2 16 18 28
  2 15 15 24
False Negative Findings 8 15 32 12
  8 16 35 16
False Positive Findings 10 40 19 11
  16 49 25 9
True Negative Findings 196 145 147 165
  190 136 141 167
Sensitivity [%] 20 (6-47) 52 (36-67) 36 (26-46) 70 (58-79)
  20 (6-48) 48 (33-64) 30 (20-41) 60 (48-69)
Specificity [%] 95 (95-96) 78 (76-81) 89 (86-92) 94 (91-96)
  92 (92-94) 74 (71-76) 85 (82-88) 95 (92-97)
negative predictive value [%] 96 (95-97) 91 (88-94) 82 (79-85) 93 (91-95)
  96 (95-97) 90 (86-93) 80 (77-83) 91 (89-93)
accuracy [%] 92 (90-94) 75 (70-79) 76 (72-81) 89 (85-93)
  89 (88-42) 70 (66-74) 72 (68-77) 88 (84-92)