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Table 4 Risk score stratifications of mortality at 2 and 5 years

From: Risk scores to predict mortality 2 and 5 years after surgery for colorectal cancer in elderly patients

  No. event/no. at risk HR (95% CI) p value
Mortality at 2 years
 Risk score (continuous) - 1.33 (1.26, 1.41) < 0.001
 Risk score (categorical)    
  0–3 (low) 20/213 (9.39) Reference  
  4–7 (moderate) 25/99 (25.25) 3.08 (1.71, 5.55) < 0.001
  ≥ 8 (high) 34/54 (62.96) 10.50 (6.02, 18.29) < 0.001
 C-index* 0.80 (0.76, 0.85)
 GND test* < 0.001
Mortality at 5 years
 Risk score (continuous) - 1.27 (1.20, 1.36) < 0.001
 Risk score (categorical)    
  0–10 (low) 16/92 (17.39) Reference  
  11–16 (moderate) 61/190 (32.11) 1.99 (1.15, 3.45) 0.015
  ≥ 17 (high) 22/31 (70.97) 6.10 (3.19, 1) < 0.001
 C-index* 0.72 (0.67, 0.77)
 GND test < 0.001  
  1. There are pairwise-statistical significant differences among the three established categories in both developed risk scores. Reference reference category, No. event/no.at risk number of events/no. of patients in the risk level, HR hazard ratio, CI confidence interval, C-index concordance index, GND the Greenwood-Nam-D'Agostino test
  2. *Hospital-adjusted values