Table 2.

Odds of developing PCCRC-3yr in relation to characteristics of study population and type of colonoscopy

Characteristic	Unadjusted			Adjusted
	Odds ratio (95% CI)	P value		Odds ratio (95% CI)	P value
Year of colonoscopy
2005-07	1	—		1	—
2008-10	0.89 (0.84 to 0.93)	<0.01		0.86 (0.82 to 0.91)	<0.01
2011-13	0.78 (0.74 to 0.83)	<0.01		0.70 (0.66 to 0.74)	<0.01
Age at colonoscopy
≤60	1	—		1	—
61-70	0.93 (0.87 to 1.00)	0.05		1.02 (0.94 to 1.09)	0.67
71-80	1.21 (1.14 to 1.29)	<0.01		1.02 (0.96 to 1.10)	0.50
>80	1.49 (1.39 to 1.60)	<0.01		1.17 (1.09 to 1.27)	<0.01
Sex
Male	1	—		1	—
Female	1.16 (1.11 to 1.21)	<0.01		1.15 (1.10 to 1.20)	<0.01
IMD income category
Most affluent	1	—		1	—
2	0.99 (0.93 to 1.06)	0.86		0.98 (0.91 to 1.04)	0.50
3	0.99 (0.93 to 1.06)	0.83		0.98 (0.91 to 1.05)	0.52
4	1.01 (0.94 to (1.08)	0.97		0.97 (0.91 to 1.04)	0.44
Least affluent	1.00 (0.93 to 1.07)	0.9		0.93 (0.86 to 1.00)	0.27
Charlson comorbidity score
0	1	—		1	—
1	1.50 (1.42 to 1.58)	<0.01		1.36 (1.28 to 1.44)	<0.01
2	1.87 (1.72 to 2.03)	<0.01		1.62 (1.48 to 1.76)	<0.01
≥3	2.58 (2.36 to 2.81)	<0.01		2.17 (1.98 to 2.38)	<0.01
Inflammatory bowel disease
No	1	—		1	—
Yes	7.60 (7.00 to 8.24)	<0.01		4.93 (4.50 to 5.40)	<0.01
Diverticular disease
No	1	—		1	—
Yes	2.08 (1.99 to 2.17)	<0.01		1.88 (1.79 to 1.97)	<0.01
Colonoscopy within BCSP
No	1	—		1	—
Yes	0.4 (0.39 to 0.46)	<0.01		0.68 (0.62 to 0.74)	<0.01
Colonoscopy by independent provider
No	1	—		1	—
Yes	1.29 (1.11 to 1.51)	<0.01		1.63 (1.39 to 1.91)	<0.01
Previous colorectal cancer
No	1	—		1	—
Yes	5.95 (5.35 to 6.62)	<0.01		2.24 (2.00 to 2.52)	<0.01
Previous colonoscopy
No	1	—		1	—
Yes	4.41 (4.22 to 4.62)	<0.01		3.29 (3.13 to 3.46)	<0.01