“…5 Expected complexity of ERCP was not related to post-ERCP complications (7.1% in Group I,8.1% in Group II, 12.1% in Group III, and 2.9% in Group IV; P ϭ 0.20) but did show a significant influence on total technical success (93% in Group I, 82.5% in Group II, 79% in Group III, and 59% in Group IV; P ϭ 0.0001). A naïve papilla was the only variable associated with a higher complication rate (11.2% vs. 3.5%; P ϭ 0.001).…”