Table 1.

Gender distribution and histological trend over time (2000–2017) of malignant colorectal polyps in patients aged 20–49 years.

	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016	2017
Female	226	235	242	242	223	235	282	307	293	329	355	315	346	332	342	315	332	340
Male	245	233	266	250	247	268	286	291	356	349	325	365	341	316	379	356	389	306
Adenocarcinoma in adenomatous polyp	169	152	191	166	184	179	239	237	245	270	247	283	281	276	309	298	280	275
Serrated adenocarcinoma	0	0	0	0	0	1	0	0	1	0	0	0	0	2	0	0	1	2
Adenocarcinoma in multiple adenomatous polyp	1	3	2	4	3	6	1	3	1	0	2	1	3	4	2	0	1	0
Adenocarcinoma in villous adenoma	108	112	101	101	91	95	93	101	101	96	91	79	72	61	64	59	49	46
Adenocarcinoma in tubulovillous adenoma	193	212	214	221	192	222	244	257	301	312	340	317	331	305	346	314	390	323