Trends in colorectal cancer incidence according to an increase in the number of colonoscopy cases in Korea

Table 1 The incidence of colorectal cancer by age and gender between 2004 and 2020, n (%)

	2004	2005	2006	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020
Number of patients	15278	17090	20059	20750	21613	24179	24969	28342	29033	28480	27866	27624	29528	29452	29204	30025	27204
Age category (yr)
Male	8948	9999	11709	12283	12786	14347	14991	17112	17530	17086	16674	16462	17680	17497	17479	17877	16178
< 50	1613 (18.0)	1740 (17.4)	1834 (15.7)	1728 (14.1)	1830 (14.3)	1728 (12.0)	1834 (12.2)	2077 (12.1)	2032 (11.6)	1930 (11.3)	1741 (10.4)	1582 (9.6)	1677 (9.5)	1653 (9.4)	1592 (9.1)	1555 (8.7)	1491 (9.2)
50-75	6499 (72.6)	7306 (73.1)	8603 (73.5)	9167 (74.6)	9437 (73.8)	10730 (74.8)	11137 (74.3)	12608 (73.7)	12764 (72.8)	12257 (71.7)	11894 (71.3)	11635 (70.7)	12382 (70.0)	12151 (69.4)	11929 (68.2)	12234 (68.4)	10940 (67.6)
≥ 76	836 (9.3)	953 (9.5)	1272 (10.9)	1388 (11.3)	1519 (11.9)	1889 (13.2)	2020 (13.5)	2427 (14.2)	2734 (15.6)	2899 (17.0)	3039 (18.2)	3245 (19.7)	3621 (20.5)	3693 (21.1)	3958 (22.6)	4088 (22.9)	3747 (23.2)
Female	6330	7091	8350	8467	8827	9832	9978	11230	11503	11394	11192	11162	11848	11955	11725	12148	11026
< 50	1284 (20.3)	1350 (19.0)	1482 (17.7)	1357 (16.0)	1384 (15.7)	1460 (14.8)	1364 (13.7)	1559 (13.9)	1539 (13.4)	1413 (12.4)	1365 (12.2)	1261 (11.3)	1239 (10.5)	1358 (11.4)	1298 (11.1)	1261 (10.4)	1204 (10.9)
50-75	4302 (68.0)	4767 (67.2)	5624 (67.4)	5731 (67.7)	5929 (67.2)	6555 (66.7)	6596 (66.1)	7388 (65.8)	7430 (64.6)	7243 (63.6)	6980 (62.4)	6818 (61.1)	7092 (59.9)	6948 (58.1)	6630 (56.5)	6931 (57.1)	6208 (56.3)
≥ 76	744 (11.8)	974 (13.7)	1244 (14.9)	1379 (16.3)	1514 (17.2)	1817 (18.5)	2018 (20.2)	2283 (20.3)	2534 (22.0)	2738 (24.0)	2847 (25.4)	3083 (27.6)	3517 (29.7)	3649 (30.5)	3797 (32.4)	3956 (32.6)	3614 (32.8)