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Table 3 Adjusted sub-hazard ratios (95% CI) of colorectal cancer death with history of pre-diagnostic colonoscopy among patients diagnosed in 2003–2013*

From: Pre-diagnostic colonoscopies reduce cancer mortality - results from linked population-based data in South Australia

  No. patient Person time (person year) No. Event Model 1 Model 2
Pre-diagnostic colonoscopy examinations
 0 8194 28,653.08 2505 1.00
 1 3574 14,305.83 1023 0.83 (0.77–0.90) 0.85 (0.79–0.91)
 2 744 2600.52 179 0.73 (0.63–0.89) 0.81 (0.70–0.95)
  > = 3 394 1226.19 64 0.55 (0.43–0.70) 0.68 (0.53–0.86)
Time from initial colonoscopy to diagnosis
  < 1 year 2989 12,481.72 883 1.00 1.00
  > = 1 year 1723 5650.82 383 0.83 (0.73–0.94) 0.97 (0.85–1.10)
  1. *Sub hazard ratios (SHR) from competing risk survival regression model