Table 4. Results of the univariate analysis and ROC analysis.
| Parameter | P value | AUC (95% CI) | Sensitivity (%) | Specificity (%) | Accuracy (%) |
|---|---|---|---|---|---|
| DWI_maximum | 0.0379 | 0.589 (0.513−0.663) | 58.97 | 57.73 | 56.6 |
| DWI_skewness | 0.0185 | 0.601 (0.524−0.674) | 67.96 | 51.55 | 56.6 |
| D_kurtosis | 0.0416 | 0.588 (0.511−0.662) | 41.03 | 74.23 | 57.7 |
| D_minimum | 0.0130 | 0.604 (0.528−0.677) | 76.92 | 44.33 | 57.1 |
| D_skewness | 0.0250 | 0.596 (0.519−0.669) | 83.33 | 38.14 | 55.4 |
| D*_energy | 0.0063 | 0.621 (0.545−0.693) | 38.74 | 87.63 | 65.1 |
| D*_skewness | 0.0081 | 0.613 (0.537−0.686) | 76.92 | 49.48 | 57.7 |
| f_minimum | 0.0027 | 0.624 (0.548−0.696) | 75.64 | 45.36 | 60.6 |
| PCI | 0.0002 | 0.645 (0.569−0.715) | 53.85 | 71.13 | 64.0 |
ROC, receiver operating characteristic curve; AUC, area under the curve; CI, confidence interval; DWI, diffusion-weighted imaging; D, true diffusion coefficient; D*, pseudo-diffusion coefficient; f, perfusion fraction; PCI, percentage of rectal wall circumference invasion.