Table 10 Diagnostic parameters of the computed tomography colonography for predicting the T and N stages of tumors of the colon
Prediction of stage of tumor | True Positives (TP) | True Negative (TN) | Positive predictive value (PPV) (TP + TN) | False Positives (FP) | False Negative (FN) | Negative predictive value (NPV) (FP + FN) | Sensitivity | Specificity | Accuracy | κa | Cla |
|---|---|---|---|---|---|---|---|---|---|---|---|
T staging | 193 (68.5) | 01 (0.5) | 194 (69) | 37 (13) | 49 (18) | 86 (31) | 79.75% | 2% | 69.29% | 0.65 | 0.53–0.72 |
Differentiation of tumors confined to the colon wall (T1/T2) from advanced tumors (T3/T4) | 79 (28) | 155 (55.5) | 234 (83.5) | 16 (5.5) | 30 (11) | 46 (16.5) | 72.48% | 90.64% | 83.57% | 0.69 | 0.51–0.75 |
Differentiation of tumors between low–intermediate risk and high risk | 145 (52) | 90 (32) | 235 (84) | 11 (4) | 34 (12) | 45 (16) | 81.01% | 89.11% | 83.93% | 0.68 | 0.53–0.75 |
Involvement of the colonic circumference | 94 (34) | 136 (49) | 230 (83) | 35 (12) | 15 (5) | 50 (17) | 86.24% | 79.53% | 82.14% | 0.67 | 0.54–0.71 |
N staging | 61 (22) | 127 (45) | 188 (67) | 65 (23) | 27 (10) | 92 (33) | 69.31% | 66.15% | 67.14% | 0.41 | 0.59–0.69 |