Retrospective Cohort Study
Copyright ©The Author(s) 2021.
World J Gastroenterol. May 28, 2021; 27(20): 2603-2614
Published online May 28, 2021. doi: 10.3748/wjg.v27.i20.2603
Table 2 Presentation of gastrointestinal and extraintestinal manifestations at diagnosis and at follow-up visits, by country

All patients (n = 300)
United Kingdom patients (n = 100)
United States patients (n = 100)
Norway patients (n = 100)
At diagnosis, n (%)
At follow-up1, n (%)
At diagnosis, n (%)
At follow-up1, n (%)
At diagnosis, n (%)
At follow-up1, n (%)
At diagnosis, n (%)
At follow-up1, n (%)
Gastrointestinal manifestations2
None344 (14.7)191 (63.7)26 (26.0)69 (69.0)10 (10.0)56 (56.0)8 (8.0)66 (66.0)
Diarrhea147 (49.0)100 (33.3)44 (44.0)35 (35.0)54 (54.0)45 (45.0)49 (49.0)20 (20.0)
Abdominal pain124 (41.3)93 (31.0)26 (26.0)23 (23.0)46 (46.0)45 (45.0)52 (52.0)25 (25.0)
Abdominal distension12 (4.0)11 (3.7)0 (0.0)0 (0.0)7 (7.0)9 (9.0)5 (5.0)2 (2.0)
Poor appetite5 (1.7)6 (2.0)0 (0.0)1 (1.0)2 (2.0)2 (2.0)3 (3.0)3 (3.0)
Constipation38 (12.7)47 (15.7)6 (6.0)6 (6.0)15 (15.0)29 (29.0)17 (17.0)12 (12.0)
Weight loss6 (2.0)33 (11.0)0 (0.0)6 (6.0)5 (5.0)17 (17.0)1 (1.0)10 (10.0)
Weight gain44 (14.7)27 (9.0)10 (10.0)0 (0.0)25 (25.0)24 (24.0)9 (9.0)3 (3.0)
Malabsorption1 (0.3)0 (0.0)0 (0.0)0 (0.0)0 (0.0)0 (0.0)1 (1.0)0 (0.0)
Bloating90 (30.0)76 (25.3)26 (26.0)26 (26.0)31 (31.0)31 (31.0)33 (33.0)19 (19.0)
Hard stools4 (1.3)6 (2.0)0 (0.0)0 (0.0)4 (4.0)4 (4.0)0 (0.0)2 (2.0)
Mouth ulcers3 (1.0)2 (0.7)2 (2.0)0 (0.0)0 (0.0)1 (1.0)1 (1.0)1 (1.0)
Extraintestinal manifestations2
None372 (24.0)153 (51.0)37 (37.0)71 (71.0)24 (24.0)38 (38.0)11 (11.0)44 (44.0)
Brain fog11 (3.7)10 (3.3)0 (0.0)0 (0.0)10 (10.0)10 (10.0)1 (1.0)0 (0.0)
Nutritional deficiency104 (34.7)108 (36.0)27 (27.0)27 (27.0)34 (34.0)59 (59.0)43 (43.0)22 (22.0)
Osteoporosis/osteopenia21 (7.0)54 (18.0)5 (5.0)16 (16.0)11 (11.0)26 (26.0)5 (5.0)12 (12.0)
Anemia52 (17.3)41 (13.7)29 (29.0)19 (19.0)22 (22.0)20 (20.0)1 (1.0)2 (2.0)
Malignancy2 (0.7)5 (1.7)0 (0.0)0 (0.0)2 (2.0)3 (3.0)0 (0.0)2 (2.0)
Cardiovascular disease8 (2.7)10 (3.3)0 (0.0)0 (0.0)1 (1.0)2 (2.0)7 (7.0)8 (8.0)
Infertility4 (1.3)5 (1.7)0 (0.0)2 (2.0)4 (4.0)3 (3.0)0 (0.0)0 (0.0)
Depression11 (3.7)12 (4.0)1 (1.0)2 (2.0)8 (8.0)8 (8.0)2 (2.0)2 (2.0)
Anxiety8 (2.7)9 (3.0)1 (1.0)0 (0.0)4 (4.0)8 (8.0)3 (3.0)1 (1.0)
Headaches11 (3.7)21 (7.0)2 (2.0)2 (2.0)7 (7.0)15 (15.0)2 (2.0)4 (4.0)
Neuropathy3 (1.0)4 (1.3)0 (0.0)2 (2.0)3 (3.0)2 (2.0)0 (0.0)0 (0.0)
Autoimmune disease34 (11.3)38 (12.7)2 (2.0)2 (2.0)14 (14.0)16 (16.0)18 (18.0)20 (20.0)
Skin and dental conditions7 (2.3)7 (2.3)0 (0.0)0 (0.0)3 (3.0)4 (4.0)4 (4.0)3 (3.0)
Hair loss5 (1.7)2 (0.7)0 (0.0)0 (0.0)3 (3.0)2 (2.0)2 (2.0)0 (0.0)
Liver abnormalities46 (2.0)11 (3.7)1 (1.0)2 (2.0)3 (3.0)6 (6.0)2 (2.0)3 (3.0)
Musculoskeletal symptoms 28 (9.3)38 (12.7)5 (5.0)7 (7.0)9 (9.0)11 (11.0)14 (14.0)20 (20.0)