Table 3.

Quality Assessment of Observational Studies Using the Newcastle‐Ottawa Scale

Study name, y	Selection	Comparability	Outcome	Overall score
Broeg‐Morvay et al, 2016 30	3*	2*	3*	8/9
Casetta et al, 2019 31	3*	2*	3*	8/9
Du et al, 2021 32	3*	2*	2*	7/9
Gong et al, 2019 33	3*	2*	2*	7/9
Kass‐Hout et al, 2014 29	3*	0*	2*	5/9
Pienimäki et al, 2021 34	3*	2*	2*	7/9
Tong et al, 2021 22	3*	2*	3*	8/9
Wang et al, 2017 35	4*	2*	3*	9/9
Weber et al, 2017 36	3*	2*	3*	8/9