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