2. Participant characteristics.
| Study | PGW/Control | ||||||
| Sample size | Mean age | Female | CBD stone | Pancreaticobiliary malignancy | SOD | History of pancreatitis (acute/chronic) | |
| Angsuwatcharakon 2012 | 23/21 | 66/64 | 43/52 | 57/48 | 26/24 | 0 | Excluded |
| Coté 2012 | 42/45 | 58/57 | NA | 24/30 | NA | Excluded | NA |
| Herreros de Tejada 2009 | 97/91 | 70/66 | 61/58 | 54/53 | 21/20 | 4/3 | 18/13 |
| Ito 2010a | 35/35 | 70/68 | 43/46 | 29/34 | 43/31 | 0/6 | 9/0 |
| Maeda 2003 | 27/26 | 64/64 | 59/54 | 7/0 | 11/23 | NA | NA |
| Yoo 2013 | 34/37 | 67/64 | 47/38 | 41/43 | 26/24 | 0 | NA |
| Zheng 2010 | 31/33 | NA | NA | NA | NA | NA | NA |
CBD: common bile duct NA: not applicable PGW: pancreatic duct guidewire placement SOD: sphincter of Oddi dysfunction