Table 2
Colonoscopy surveillance in patients and controls
Surveillance colonoscopy
No of patients
No of controls
Relative risk
95% CI
Never
38
84
1.0
Reference
Ever
2
18
0.29
0.06 to 1.31
Never
38
84
1.0
Reference
1
1
6
0.43
0.05 to 3.76
2+
1
12
0.22
0.03 to 1.74
CI, confidence interval.