Table 2

Study	Newcastle Ottawa Scale-items Score
Table 2. Methodological Quality of Cross-sectional Studies (Newcastle Ottawa Scale).
	Criteria
	Selection				Comparability 1a	Results			Total
	1	2	3	4	Comparability 1a	1	2	3	Total
Yang et al ., 2010	1	1	0	1	1	1	1	1	7
Tuckerman et al ., 2010	1	1	0	1	1	0	1	1	6
Karami et al ., 2012	1	1	1	1	1	1	1	1	8
Zhou et al ., 2012	1	1	1	1	1	1	1	1	8
Junovich et al ., 2013	1	1	0	1	1	0	1	1	6
Ozkan et al ., 2014	1	1	1	1	1	1	1	1	8
Liu et al ., 2014	1	1	1	1	1	1	1	1	8
Saifi et al ., 2014	1	1	1	1	1	1	1	1	8
Chernyshov et al ., 2014	1	1	1	1	1	1	1	1	8
Santillán et al ., 2015	1	1	1	1	1	1	1	1	8
Dons’koi, 2015	1	1	1	1	1	1	1	1	8
Galgani et al ., 2015	1	1	1	1	1	1	1	1	8
Saifi et al ., 2016	0	1	1	1	1	1	1	1	7
Wang et al ., 2017	1	1	0	1	1	1	0	1	6
Yin et al ., 2017	1	1	1	1	1	1	1	1	8
Jiang et al ., 2017	1	1	0	1	1	1	0	1	6
Kuon et al ., 2017	1	1	1	1	1	1	1	1	8
Fukui et al ., 2017	1	1	0	1	1	1	0	1	6
Chen et al ., 2017	1	1	1	1	1	1	1	1	8
Chen et al ., 2018	1	1	1	1	1	1	1	1	8
Kolanska et al ., 2019	1	1	0	1	1	1	0	1	6
Liu et al ., 2019	1	1	1	1	1	1	1	1	8
Koushaeian et al ., 2019	1	1	1	1	1	1	1	1	8
Donoghue et al ., 2019	0	1	1	1	1	1	1	1	7
Zhao et al ., 2020	0	1	1	1	1	1	1	1	7
Amjadi et al ., 2020	0	1	1	1	1	1	0	1	6
Sauerbrunn-Cutler et al ., 2021	0	1	1	1	1	1	1	1	7
Comins-Boo et al ., 2021	1	1	1	1	1	1	1	1	8
Zhao et al ., 2021	0	1	1	1	1	1	0	1	6
Kuroda et al ., 2021	1	1	1	1	1	1	1	1	8
Dons’koi et al ., 2021	1	1	0	1	1	1	0	1	6

Selection 1: Representativeness of the exposed cohort; Selection 2: Selection of the unexposed cohort; Selection 3: Exposure determination; Selection 4: Demonstration that the result of interest was not present in the baseline; Comparability 1a and 1b: Comparability of cohorts based on design or analysis; Results 1: Results assessment; Results 2: Follow-up of cohorts; Results 3: Adequacy of cohort follow-up.