Table 3.
Multivariate analysis of pretreatment computed tomography (CT) and clinical parameters
| Variable | B | HR | 95% CI | P * |
|---|---|---|---|---|
| Pretreatment CT parameters | ||||
| Tumor length | 0.073 | 1.076 | (0.954, 1.213) | 0.234 |
| Maximum tumor diameter | 0.012 | 1.012 | (0.974, 1.052) | 0.546 |
| Depth of invasion of rectal wall | -0.613 | 0.541 | (0.063, 4.627) | 0.575 |
| Distance between tumor rim and mesorectal fascia (D) | 0.019 | 1.019 | (0.863, 1.203) | 0.822 |
| Distance between inferior tumor margin and anorectal ring (L) | -0.093 | 0.911 | (0.827, 1.004) | 0.060 |
| Number of lymph nodes | 0.731 | 2.076 | (0.849, 5.078) | 0.109 |
| Number of lymph nodes in Group ① | -0.047 | 0.954 | (0.422, 2.157) | 0.911 |
| Number of lymph nodes in Group ② | -0.509 | 0.601 | (0.242, 1.493) | 0.273 |
| Number of lymph nodes in Group ③ | -1.196 | 0.302 | (0.094, 0.970) | 0.044 |
| Number of lymph nodes in Group ④ | 1.046 | 2.845 | (1.118, 7.243) | 0.028 |
| Clinical parameters | ||||
| Distance between inferior tumor margin and anorectal ring | 0.247 | 1.280 | (0.912, 1.797) | 0.153 |
| Maximum tumor diameter | -0.120 | 0.887 | (0.615, 1.281) | 0.523 |
| LNM | 0.374 | 1.454 | (1.114, 1.898) | 0.006 |
| Dukes stages | -0.316 | 0.729 | (0.501, 1.061) | 0.099 |
| ypT | 0.669 | 1.953 | (0.984, 3.879) | 0.056 |
| ypN | 0.030 | 1.030 | (0.330, 3.214) | 0.959 |
| ypM | 0.259 | 1.296 | (0.167, 10.558) | 0.804 |
Footnote: B, meaning the regression coefficient; HR, Hazard ratio; CI, Confidence interval; LNM: lymph node metastasis; ypT: yielding pathologic Tumor; ypN: yielding pathologic Node; ypM: yielding pathologic Metastasis.
*
P value were calculated using an adjusted Cox proportional-hazards model.