Comparison of the efficacy and safety of mini-percutaneous nephrolithotomy versus retrograde intrarenal surgery for the treatment of kidney stones in overweight or obese patients: a systematic review and meta-analysis

Table 2 Evaluations of the selected research literature based on the Newcastle-Ottawa Quality Assessment Scale for retrospective case-control studies

Study	Selection				Comparability		Outcome			Total scores
Study	A	B	C	D	E	F	G	H	I	Total scores
Liu, X. et al. (2022) [24]	★	★	/	★	★	★	★	★	★	8
Chen, H.Q. et al.(2018)[16]	★	★	/	★	★	★	★	★	★	8
Xu, C. et al.(2020)[18]	★	★	/	★	★	★	★	★	★	8
Ozgor, F. et al.(2016)[14]	★	★	/	★	★	★	★	★	★	8
Cepeda, M. et al.(2017) [15]	★	★	/	/	★	/	★	★	★	6
Armagan, A. et al.(2015)[15]	★	★	/	★	★	/	★	★	★	7
Ozgor, F. et al.(2018)[17]	★	★	/	★	★	★	★	★	★	8
Schoenthaler, M. et al.(2015)[13]	★	★	/	★	★	★	★	★	★	8
Pillai, S.B. et al.(2021) [19]	★	★	/	★	★	★	★	★	★	8

A: adequate case definition; B: representativeness of the cases; C: selection of controls; D: definition of controls; E: study controls for the most important factor; F: study controls for any additional factor; G: ascertainment of exposure; H: some methods of ascertainment for cases and controls; I: non-response rate

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