Table 5 Risk reduction of proximal colorectal cancer according to location and recorded completeness of colonoscopy.

	Adjusted odds ratio (95% CI)*
	Any colonoscopy	After exclusion of colonoscopies without documented completeness
Any proximal colorectal cancer	0.40 (0.21 to 0.72)	0.39 (0.18 to 0.81)
Caecum and ascending colon	0.50 (0.25 to 1.00)	0.44 (0.18 to 1.08)
Other proximal colon cancer	0.24 (0.08 to 0.68)	0.29 (0.09 to 0.98)

*Adjusted for age, sex, education, participation in general health screening examination, family history of colorectal cancer, smoking, body mass index, ever regular use of NSAIDs, ever regular use of HRT.

CI, confidence interval; HRT, hormone replacement therapy; NSAID, non‐steroidal anti‐inflammatory drug.