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Table 4 Extended Cox Regression Model: first post-operative colonoscopy variables associated with time period of diagnosis

From: A retrospective study on the use of post-operative colonoscopy following potentially curative surgery for colorectal cancer in a Canadian province

  Month 1 – 12 Month 13 – 60
  HR (95% CI) HR (95% CI)
Sex (M vs F)   
   1983 – 1989 0.88 (0.69 – 1.11) 1.24 (1.01 – 1.53)
   1990 – 1995 0.92 (0.76 – 1.11) 0.87 (0.73 – 1.05)
Pre-operative colonoscopy (yes vs no)   
   1983 – 1989 1.52 (1.20 – 1.91) 1.57 (1.29 – 1.93)
   1990 – 1995 0.88 (0.73 – 1.06) 1.46 (1.22 – 1.75)
Site of surgery (vs. edmonton)   
   1983 – 1989   
Calgary 0.56 (0.43 – 0.74) 0.61 (0.48 – 0.78)
Other major city 0.71 (0.50 – 1.02) 0.69 (0.50 – 0.95)
Other 0.74 (0.46 – 1.20) 0.66 (0.46 – 0.96)
   1990 – 1995   
Calgary 0.54 (0.43 – 0.68) 1.08 (0.87 – 1.33)
Other major city 1.06 (0.82 – 1.37) 1.34 (1.04 – 1.73)
Other 0.78 (0.53 – 1.15) 0.97 (0.66 – 1.42)