This finding was consistent among @ patients who underwent pancreaticoduodenectomy ( @ % vs. @ % ; relative risk , @ ; @ % CI , @ to @ ) and @ patients who underwent distal pancreatectomy ( @ % vs. @ % ; relative risk , @ ; @ % CI , @ to @ ) , as well as among @ patients with a dilated pancreatic duct ( @ % vs. @ % ; relative risk , @ ; @ % CI , @ to @ ) and @ patients with a nondilated pancreatic duct ( @ % vs. @ % ; relative risk , @ ; @ % CI , @ to @ ) .