Table 2 Temporal trends in colorectal cancer presentation with the introduction of screening

	All patients		Pre-screening				Screening introduction				Postscreening
			Early		Late		Early		Late
			2003–2004		2005–2006		2007–2008		2009–2010		2011–2012
	n (14 487)	%	n (2380)	%	n (2384)	%	n (3098)	%	n (3282)	%	n (3343)	%	P -value
Age (years)
⩽50	751	5	129	5	129	5	172	6	139	4	182	5
50–74	8142	56	1250	53	1368	57	1702	55	1897	58	1925	58
⩾75	5299	37	851	35	793	33	1202	39	1224	37	1229	37	0.584
Unknown	295	2	150	6	94	4	22	1	23	1	6	0
Sex
Female	6364	44	1017	42	1054	44	1384	45	1416	43	1493	45
Male	7827	54	1213	51	1236	52	1692	55	1843	56	1843	55	0.169
Unknown	296	2	150	6	94	4	22	1	23	1	7	0
Deprivation category
1 (most deprived)	4329	30	667	28	706	30	935	30	978	30	1043	31
2	3398	23	545	23	555	23	732	24	776	24	790	24
3	2370	16	364	15	380	16	529	17	557	17	540	16
4	1921	13	307	13	300	13	406	13	433	13	475	14
5 (least deprived)	2072	14	247	16	349	15	474	15	514	16	488	15	0.057
Unknown	297	2	150	6	94	4	22	1	24	1	7	0
Presentation to surgery
Emergency	2163	15	480	20	431	18	414	13	420	13	418	13
Elective
Symptomatic	8948	62	1849	78	1868	78	1910	62	1729	53	1592	47
Screen detected^a	1200	8	—	—	—	—	107	3	486	15	607	18	⩽0.001^b
Did not undergo procedure	2056	14	30	1	56	2	624	20	642	20	704	21
Unknown	115	1	21	5	29	3	43	1	5	0	22	1
Site of tumour
Right colon	4857	34	753	32	811	34	1048	34	1099	34	1146	34
Left colon	4827	33	790	33	736	31	997	32	1165	35	1139	34
Rectum	4647	32	825	34	818	34	996	32	983	30	1025	31	0.001
Multiple/unknown	156	1	12	1	19	1	57	2	35	1	33	1
Management Intent
Curative intent	9980	68	1797	76	1744	73	1972	64	2238	68	2229	67
Palliative procedure	1877	13	440	18	389	16	337	11	334	10	377	11	⩽0.001^c
Did not undergo procedure	2056	14	30	1	56	2	624	20	642	20	704	21
Unknown/other	574	4	113	5	195	8	165	5	68	2	33	1

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