Table 3.
Risk of colorectal cancer expressed as the standardized incidence ratio (SIR) with 95% confidence interval (lower confidence limit (LCL), upper confidence limit (UCL)) in the obesity surgery (OS) and the obese no OS groups.
| Variable | OS |
Obese No OS |
||||||
|---|---|---|---|---|---|---|---|---|
| n | SIR | LCL | UCL | n | SIR | LCL | UCL | |
| Total | 43 | 1.26 | 0.92 | 1.71 | 3237 | 1.12 | 1.08 | 1.16 |
| Gender | ||||||||
| Male | 16 | 1.41 | 0.81 | 2.29 | 1850 | 1.21 | 1.15 | 1.26 |
| Female | 27 | 1.19 | 0.79 | 1.74 | 1387 | 1.02 | 0.97 | 1.08 |
| Age groups at entry into the cohorts, years | ||||||||
| 18–39 | 2 | 0.79 | 0.10 | 2.85 | 54 | 1.35 | 1.02 | 1.77 |
| 40–49 | 7 | 0.83 | 0.34 | 1.72 | 174 | 1.19 | 1.02 | 1.38 |
| ≥50 | 34 | 1.47 | 1.02 | 2.06 | 3009 | 1.11 | 1.07 | 1.15 |
| Calendar year | ||||||||
| 1997–2005 | 5 | 2.17 | 0.70 | 5.07 | 497 | 0.94 | 0.86 | 1.02 |
| 2006–2013 | 38 | 1.20 | 0.85 | 1.65 | 2740 | 1.16 | 1.12 | 1.21 |
| Follow-up time, years | ||||||||
| 1–2 | 26 | 1.24 | 0.81 | 1.81 | 1706 | 1.14 | 1.09 | 1.20 |
| ≥2 | 17 | 1.32 | 0.77 | 2.11 | 1531 | 1.10 | 1.04 | 1.15 |
| Surgery type | ||||||||
| Restrictive surgery | 29 | 1.41 | 0.94 | 2.02 | – | – | – | – |
| Restrictive and malabsorptive surgery | 14 | 1.05 | 0.57 | 1.76 | – | – | – | – |