Comparison of arthroscopic and open Brostrom-Gould surgery for chronic ankle instability: a systematic review and meta-analysis

Table 2 Quality assessment for the nine cohort studies according to Newcastle–Ottawa scale (NOS)

Study	Year	S				C		E			Total score
Study	Year	S1	S2	S3	S4	C1	C2	E1	E2	E3	Total score
Baek [22]	2023	★	★	★	★	★	★	★	★	★	9
Wang [23]	2023	★	★	★	★	★	★	★	★	★	9
Wang [24]	2023	★	★	★	★	★	★	★	★	–	8
Zhou [13]	2021	★	★	★	★	★	★	★	★	★	9
Woo [26]	2020	★	★	★	★	★	★	★	★	★	9
Yi [27]	2019	★	★	★	★	★	–	★	★	★	8
Rigby [1]	2019	★	★	★	★	★	–	★	★	★	8
Li [28]	2017	★	★	★	★	★	–	★	★	★	8
Matsui [30]	2016	★	★	★	★	★	–	★	★	★	8

★: The scale uses a star symbol (★) to represent points, and each star represents one point
S selection, C comparability, E exposure. S1 representativeness of the exposed cohort, S2 selection of the nonexposed cohort, S3 ascertainment of exposure, S4 demonstration that outcome of interest was not present at start of study. C1 comparability of controls for the most important factor, C2 comparability of controls for a second important factor. E1 assessment of outcome, E2 was follow-up long enough for outcomes to occur, E3 adequacy of follow-up of cohorts

ISSN: 1749-799X