Table 4.
Contingency analysis of c, MRI, and combined MRI and c for predicting pT3-4 and pN1-2 using histopathology as reference standard.
| Overall accuracy (%) | Weighted Kappa (95%CI) | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | |
|---|---|---|---|---|---|---|
| Predicting pT1-2 ( 40 ) vs pT3-4(+) | ||||||
| MRI | 96 (77/80) | 0.92 (0.83-1.00) | 98 (47/48) | 94 (30/32) | 96 (47/49) | 97 (30/31) |
| c | 76 (61/80) | 0.49 (0.29-0.68) | 88 (42/48) | 59 (19/32) | 76 (42/55) | 76 (19/25) |
| MRI + c | 96 (77/80) | 0.92 (0.83-1.00) | 98 (47/48) | 94 (30/32) | 96 (47/49) | 97 (30/31) |
| Predicting pN0 ( 40 ) vs pN1-2(+) | ||||||
| MRI | 74 (59/80) | 0.49 (0.32-0.66) | 92 (24/26) | 65 (35/54) | 56 (24/43) | 95 (35/37) |
| c | 68 (54/80) | 0.38 (0.21-0.56) | 88 (23/26) | 57 (31/54) | 50 (23/46) | 91 (31/34) |
| MRI + c | 84 (67/80) | 0.65 (0.47-0.82) | 85 (22/26) | 83 (45/54) | 71 (22/31) | 92 (45/49) |
Prefix p in the stages represents pathology. PPV, positive predictive value; NPV, negative predictive value.