Intraoperative complication rates (%)				PCR rates (%)
Study	Retrospective or prospective	n	Overall	Consultant	Fellows	Trainees	Overall	Consultant	Fellows	Trainees
Current study 2018	Retrospective	645	4.03	3.16	6.39	2.13	1.86	0.7	3.65	1.42
Kim et al[@179255] 2017a	Prospective	500	N/A	8.4	6.4	10.8	2.6	NA	NA	NA
Payal et al[@179256] 2016	Retrospective	4221	NA	NA	NA	NA	NA	NA	NA	4.41
Cavallini et al[@179252] 2015	Prospective	150	NA	NA	NA	12	NA	NA	NA	4.7
Day et al[@179254] 2015	Prospective	180,114	4.2	3.5	NA	6.3	1.95	1.6	NA	3.2
Ti et al[@179251] 2014	Retrospective	48 377	NA	NA	NA	NA	1.8	1.4	NA	3.4
Meeks et al[@179257] 2013	Retrospective	416	NA	NA	NA	2.5	NA	NA	NA	1.64
Brizsi et al[@179258] 2012	Retrospective	600	NA	NA	NA	3.8	NA	NA	NA	3.8
Fong et al[@179259] 2011	Prospective	514	NA	2.7*	2.7*	6.1	NA	2.7	NA	3.3
Woodfield et al[@179260] 2011	Retrospective	718	NA	NA	NA	Junior trainees: 7.9 Senior trainees: 7.6	NA	NA	NA	Junior trainees: 5.7 Senior trainees: 3.7
Johnston et al[@179250] 2010	Prospective	55,567	NA	NA	NA	NA	1.92	1.41	NA	Senior trainees: 2.48 Junior trainees: 5.10
Lee et al[@179261] 2009	Prospective	226	NA	NA	NA	27.4	NA	NA	NA	4.9
Rogers et al[@179262] 2009	Retrospective	1832	NA	NA	NA	NA	NA	NA	NA	3.77-7.17
Rutar et al[@179263] 2009	Retrospective	320	NA	NA	NA	4.7	NA	NA	NA	3.1
Buchan et al[@179264] 2008	Retrospective	4322	NA	NA	NA	NA	NA Trainees: 2.29%	NA	NA	2.29
Bhagat et al[@179265] 2007	Retrospective	755	NA	NA	NA	NA	NA	NA	NA	6.7
Randleman et al[@179266] 2007	Retrospective	680	NA	NA	NA	5	NA	NA	NA	4.9
Zaidi et al[@179267] 2007	Prospective	1000	8.7	0.1	4.5	6.5	1.1	NA	NA	NA