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Table 4 Final Cox Proportional Hazards Model in Overall Cohort

From: Laparoscopic versus open colectomy for colon cancer in an older population: a cohort study

Variable Hazard Ratio 95% CI P valuea
Laparoscopic Colectomy 0.902 0.776-1.050 0.1838
Female Gender 0.846 0.818-0.876 < 0.0001
Black Race 1.174 1.104-1.249 < 0.0001b
Emergent Presentation 1.419 1.325-1.519 < 0.0001
Positive Nodes 1.897 1.812-1.986 < 0.0001
Chemotherapy Receipt 3.380 2.040-5.600 < 0.0001
Chemotherapy*ln(survival time) 1.356 1.314-1.399 < 0.0001
Regional Stage 1.264 1.201-1.329 < 0.0001c
Distant Stage 5.560 5.236-5.903 < 0.0001c
Regional Stage*ln(survival time) 0.967 0.941-0.993 0.0127
Distant Stage*ln(survival time) 1.037 1.006-1.068 0.0184
Age at Dx (1-year change) 1.056 1.053-1.059 < 0.0001
Age at Dx*ln(survival time) 1.003 1.001-1.004 0.0011
Age at Dx*Chemotherapy 0.978 0.972-0.985 < 0.0001
Charlson index (1-unit change) 1.257 1.237-1.277 < 0.0001
  1. Dx, Diagnosis.
  2. a Wald test.
  3. b Compared with white/other race.
  4. c Compared with localized stage.