Table 3.

Characteristics of the individuals and cancers occurring within 3 years of a colonoscopy undertaken between 2001 and 2007

	Cancers occurring in individuals
	>6 months after colonoscopy		≤ 6 months after colonoscopy		All cancers
Characteristic	n	%	n	%	n
Median age at diagnosis (IQR)	72 (64–69)		74 (65–81)		72 (64–79)
Sex
Male	2625	8.1	29 755	91.9	32 380
Female	2346	9.2	23 237	90.2	25 583
IMD income category at diagnosis
Most affluent	1009	8.7	10 548	91.3	11 557
2	1101	8.8	11 454	91.2	12 555
3	986	8.0	11 382	92.0	12 368
4	1012	8.6	10 742	91.4	11 754
Most deprived	863	8.9	8866	91.1	9729
Charlson comorbidity score at diagnosis
0	3042	7.5	37 431	92.5	40 473
1	873	10.6	7366	89.4	8239
2	648	10.1	5745	89.9	6393
≥3	408	14.3	2450	85.7	2858
Previous in-patient hospital episode for Crohn's disease
No	4743	8.3	52 496	91.7	57 239
Yes	228	31.5	496	68.5	724
Previous in-patient hospital episode for ulcerative colitis
No	4392	7.8	51 943	92.2	56 335
Yes	579	35.6	1049	64.4	1628
Previous in-patient hospital episode for diverticular disease
No	2954	7.2	37 971	92.8	40 925
Yes	2017	11.8	15 021	88.2	17 038
Number of colonoscopic investigations in time period
1	4223	7.7	50 669	92.3	54 892
>1	748	24.4	2323	75.6	3071
Dukes’ stage at diagnosis
A	732	9.5	6968	90.5	7700
B	1029	6.3	15 213	93.7	16 242
C	994	7.0	13 178	93.0	14 172
D	686	10.2	6071	89.8	6757
Unknown	1530	11.7	11 562	88.3	13 092
Tumour site
Rectal/sigmoid colon	1897	6.7	26 349	93.3	28 246
Splenic flexure/descending colon	206	7.4	2580	92.6	2786
Transverse colon	276	8.6	2923	91.4	3199
Right colon	1859	9.8	17 916	94.0	19 055
Colon NOS	733	15.7	3944	84.3	4677
Total	4971	8.6	52 992	91.4	57 963

IMD, Index of Multiple Deprivation; NOS, not otherwise specified.