Table 1.

Characteristics of included studies

First author year	Country	Study interval	Design	LOE	No.of patients	Matching/comparablea
Bozkurt, 2015 [12]	Turekey	2012–2015	Retrospective	3b	437	1,2,3,4,5
Choi, 2016 [13]	Korea	2003–2014	Retrospective	3b	217	1,2,3,4,5,6
Choi, 2016 [14]	Korea	2012–2015	Retrospective	3b	141	1,2,3,4, 5,6
Jaipuria, 2016 [15]	India	2014–2015	prospective	3b	606	1,3
Kocaaslan, 2016 [16]	Turekey	2010–2015	Retrospective	3b	137	1,2,3,4, 5,6
Labadie, 2015 [17]	USA	2009–2012	Retrospective	3b	246	1,2,3,4, 5,6
Noureldin, 2015 [18]	Canada	2009–2013	Retrospective	3b	185	1,2,3,5
Sfoungaristos, 2016 [19]	Israel	2010–2015	Retrospective	3b	73	1,3,4, 5,6
Tailly, 2016 [20]	Canada	2006–2013	Retrospective	3b	586	1,2,3,4, 5,6
Yarimoglu, 2016 [21]	Turekey	2012–2015	Retrospective	3b	262	1,2,3,4, 5

^a Matching/comparable variable: 1 = age, 2 = BMI, 3 = gender, 4 = laterality(right/left), 5 = stone burden, 6 = stone density