| Characteristics | All patients | Iodine allergic patients |
| Endoscopic procedure, no | 2295 | 127 | Age (years), mean ± SD | | | Gender | | | (i) Male, no (%) | 1067 (46.5) | 46 (36.2) | (ii) Female, no (%) | 1228 (53.5) | 81 (63.8) | Year of the procedure | | | (i) 2010, no (%) | 345 (15.0) | - | (ii) 2011, no (%) | 338 (14.7) | - | (iii) 2012, no (%) | 349 (15.2) | - | (iv) 2013, no (%) | 403 (17.6) | - | (v) 2014, no (%) | 411 (17.9) | - | (vi) 2015, no (%) | 449 (19.6) | - | Allergy | | | (i) Yes, no (%) | 828 (36.1) | 127 (100.0) | (ii) No, no (%) | 1467 (63.9) | 0 (0.0) | Iodine Allergy | | | (i) Yes, no (%) | 127 (5.5) | 127 (100.0) | (ii) No, no (%) | 2168 (94.5) | 0 (0.0) | History of severe iodine allergic reaction | | | (i) Yes, no (%) | 0 (0.0) | 17 (13.3) | Prior iodine allergic reaction reported | | | (i) Rash, no (%) | - | 36 (28.3) | (ii) Oedema-angioedema, no (%) | - | 34 (26.7) | (iii) Others-unknown, no (%) | - | 57 (44.8) | ERCP indication | | | (i) Lithiasis, no (%) | 978 (42.6) | 40 (31.5) | (ii) Cholangitis, no (%) | 442 (19.3) | 35 (27.5) | (iii) Main biliary obstructive lesion, no (%) | 508 (22.1) | 30 (23.6) | (iv) Stent manipulation, no (%) | 228 (9.9) | 14 (11.0) | (v) Chronic pancreatitis, no (%) | 24 (1.0) | 0 (0.0) | (vi) Biliary leak, no (%) | 26 (1.1) | 1 (0.8) | (vii) Other, no (%) | 89 (3.9) | 7 (5.5) | Hospitalised for ERCP | | | (i) Yes, no (%) | - | 77 (60.6) | (ii) No, no (%) | - | 47 (37.0) | (iii) Unknown, no (%) | - | 3 (2.4) |
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