Table 2.

Distribution of phenotype by era of diagnosis.

Year of diagnosis	1959-1999	2000-2010	2011-2022	P
Location %
N	646	679	694
L1 ileum only	34	32	38	0.016
L2 colon only	13	20	20
L3 ileocolon	53	48	42
Behavior %
N	581	614	655
B1	37	57	71	<0.0001
B2	36	23	18
B3	27	20	11