Table 2.
Multivariate logistic regression analysis for identifying independent variables correlating with patient age ≥70 years
| Patient characteristic | African-American
|
White
|
Asian/Pacific Islander
|
|||
|---|---|---|---|---|---|---|
| OR (95% CI) | P-value | OR (95% CI) | P-value | OR (95% CI) | P-value | |
| Sex | ||||||
| Female vs male | 1.275 (1.215–1.339) | <0.001 | 1.332 (1.308–1.357) | <0.001 | 1.165 (1.099–1.235) | <0.001 |
| T stage | ||||||
| T3–T4 vs Tis, T0–T2 | 1.514 (1.480–1.549) | <0.001 | 1.375 (1.278–1.480) | <0.001 | ||
| N stage | <0.001 | <0.001 | <0.001 | |||
| N0 | 1.000 | 1.000 | 1.000 | |||
| N1 | 1.424 (1.337–1.517) | <0.001 | 1.259 (1.228–1.291) | <0.001 | 1.364 (1.261–1.475) | <0.001 |
| N2 | 1.264 (1.168–1.368) | <0.001 | 1.105 (1.072–1.139) | <0.001 | 1.165 (1.061–1.280) | 0.001 |
| Distant metastasis | ||||||
| Yes vs no | 0.804 (0.746–0.867) | <0.001 | 0.769 (0.746–0.793 | <0.001 | 0.783 (0.711–0.862) | <0.001 |
| Chemotherapy | ||||||
| Yes vs no | 0.304 (0.286–0.323) | <0.001 | 0.250 (0.244–0.256) | <0.001 | 0.284 (0.265–0.305) | <0.001 |
| Radiotherapy | <0.001 | |||||
| No | 1.000 | |||||
| Yes | 0.672 (0.565–0.799) | <0.001 | ||||
| Unknown | 0.725 (0.611–0.860) | <0.001 | ||||
| Pathology grade | <0.001 | <0.001 | ||||
| Well differentiated | 1.000 | 1.000 | 1.000 | |||
| Moderately differentiated | 1.120 (1.027–1.221) | 0.010 | 1.139 (1.102–1.177) | <0.001 | 1.309 (1.165–1.470) | <0.001 |
| Poorly differentiated | 1.266 (1.139–1.407) | <0.001 | 1.386 (1.333–1.441) | <0.001 | 1.308 (1.142–1.499) | <0.001 |
| Undifferentiated | 1.352 (1.104–1.655) | 0.004 | 1.426 (1.335–1.524) | <0.001 | 1.430 (1.094–1.869) | 0.009 |
| Unknown | 0.851 (0.740–0.979) | 0.024 | 0.902 (0.856–0.951) | <0.001 | 1.037 (0.862–0.249) | 0.699 |
| Pathologic type | ||||||
| Mucinous carcinoma vs adenocarcinoma | 0.699 (0.556–0.879) | 0.002 | 0.695 (0.645–0.750) | <0.001 | ||
| Number of lymph nodes | <0.001 | |||||
| ≥12 vs <12 | 0.712 (0.674–0.752) | <0.001 | 0.711 (0.697–0.725) | <0.001 | 0.656 (0.616–0.699) | <0.001 |
| Tumor size (mm) | <0.001 | <0.001 | <0.001 | |||
| ≤40 | 1.000 | 1.000 | 1.000 | |||
| 40–70 | 1.076 (1.018–1.138) | 0.010 | 1.002 (0.980–1.024) | 0.868 | 0.963 (0.899–1.033) | 0.292 |
| ≥70 | 0.845 (0.791–0.902) | <0.001 | 0.819 (0.799–0.839) | <0.001 | 0.775 (0.714–0.840) | <0.001 |
| Tumor site | <0.001 | <0.001 | <0.001 | |||
| RCC | 1.000 | 1.000 | 1.000 | |||
| LCC | 0.672 (0.635–0.711) | <0.001 | 0.507 (0.496–0.518) | <0.001 | 0.536 (0.500–0.574) | <0.001 |
| Rectum | 0.696 (0.647–0.748) | <0.001 | 0.502 (0.489–0.516) | <0.001 | 0.537 (0.497–0.581) | <0.001 |
Abbreviations: LCC, left-sided colon cancer; OR, odds ratio; RCC, right-sided colon cancer.