Table 5. Multivariate logistic regression analysis for RFS before and after PSM.
| Variables | RFS before PSM | RFS after PSM | |||||
|---|---|---|---|---|---|---|---|
| HR | 95% CI | P value | HR | 95% CI | P value | ||
| LNM+ vs. LNM− | 2.7 | 1.5–4.6 | <0.001 | 2.4 | 1.2–5 | 0.01 | |
| Age (≥70 vs. <70 years) | 1.2 | 0.7–2.1 | 0.05 | 2.1 | 1–4.1 | 0.04 | |
| Tumor location (colon vs. rectum) | 1.4 | 0.78–2.4 | 0.28 | 1.2 | 0.6–2.5 | 0.59 | |
| CEA (≥2 vs. <2 ng/mL) | 1 | 0.48–2.1 | >0.99 | 0.87 | 0.33–2.3 | 0.77 | |
| Operation method (laparoscopic vs. open) | 1.8 | 0.7–4.8 | 0.21 | 1.2 | 0.37–4.1 | 0.73 | |
| Operative blood loss (≥100 vs. <100 mL) | 1.3 | 0.54–3.2 | 0.54 | 2.1 | 0.76–5.8 | 0.15 | |
| Tumor size (cm) | 1.1 | 0.93–1.3 | 0.27 | 1.2 | 0.93–1.4 | 0.19 | |
| pT2 vs. pT1 | 1.3 | 0.7–2.5 | 0.39 | 1.1 | 0.5–2.6 | 0.75 | |
| Vascular invasion (no vs. yes) | 2.3 | 1.3–4.2 | 0.004 | 1.80 | 0.84–3.7 | 0.13 | |
CEA, carcinoembryonic antigen; CI, confidence interval; HR, hazard ratio; LNM−, lymph node metastasis negative; LNM+, lymph node metastasis positive; PSM, propensity score matching; pT, pathological T stage; RFS, relapse-free survival.