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