Table 2.

Quality assessment of eligible studies Newcastle–Ottawa scale (NOS) score

Author	Country	Selection				Comparability	Outcome			Total
		Adequate of case definition	Representativeness of the cases	Selection of Controls	Definition of Controls	Comparability of cases and controls	Ascertainment of exposure	Same method of ascertainment	Non-Response rate
Wei L 2019	China	*	*	*	*	*	*	*	*	8a
Cui Y 2017	China	*	*	*	*	*	*	*	*	8a
Li XM 2020	China	*	*	*	*	*	-	*	*	7c
Zhang HY 2017	China	*	*	*	*	*	-	*	*	7c
Li CL 2019	China	*	*	*	*	*	*	*	-	7c
Yang XH 2021	China	*	*	*	*	*	*	*	-	7c
Kang BJ 2021	China	*	*	*	*	*	*	*	-	7c
Zhao LJ 2021	China	*	*	*	*	*	*	*	-	7c
Shi JD 2019	China	*	*	*	*	*	*	*	*	8a
Zhao SS 2020	China	*	*	*	*	*	*	*	-	7b
Wang F 2021	China	*	*	*	*	*	*	*	*	8a
Gao N 2020	China	*	*	*	*	*	*	-	-	6ab
Dong Z 2020	China	*	*	*	*	*	-	*	-	6abd
Geng H 2020	China	*	*	*	*	*	*	*	*	8a
Liang R 2018	China	*	*	*	*	*	*	*	*	8a
Pang LL 2019	China	*	*	*	*	*	*	*	-	7c
Li LP 2020	China	*	*	*	*	*	-	*	-	6bd
Chen CH 2018	China	*	*	*	*	*	*	*	*	8a
Wang RX 2020	China	*	*	*	*	*	-	*	-	6bd
Liu SX 2019	China	*	*	*	*	*	*	*	*	8a
Huang YS 2022	China	*	*	*	*	*	*	*	*	8a
Wang Y 2019	China	*	*	*	*	*	*	-	-	6bd
Wang S 2018	China	*	*	*	*	*	-	*	-	6bd
Guo LF 2018	China	*	*	*	*	*	*	*	-	7c
Huang YF 2021	China	*	*	*	*	*	*	*	*	8a
Zhang NN 2021	China	*	*	*	*	*	*	*	*	8a
Chen XL 2020	China	*	*	*	*	*	*	*	*	8a
Ma XR 2019	China	*	*	*	*	*	*	*	*	8a
Dong YZ 2018	China	*	*	*	*	*	-	*	-	6ad
Cui HX 2018	China	*	*	*	*	*	*	*	*	8a
Han PF 2021	China	*	*	*	*	**	*	*	*	9
Jin B 2018	China	*	*	*	*	*	*	*	*	8a
Li Y 2022	China	*	*	*	*	*	*	*	-	7cd
Han W 2018	China	*	*	*	*	**	*	*	*	9
Zhang ZW 2021	China	*	*	*	*	*	*	*	*	8a
Fan HJ 2021	China	*	*	*	*	**	*	*	*	9
Jin LL 2019	China	*	*	*	*	*	-	*	-	6bd
Chen ZY 2017	China	*	*	*	*	*	*	*	*	8a
Wang XL 2020	China	*	*	*	*	*	*	*	-	7cd

^aOnly univariate analysis was performed, and data for multivariate analysis were lacking

^bThe article only provides data on survival prognosis and does not provide clinical pathological parameters

^cLack of data on survival prognosis, only clinicopathological parameters were provided

^dFewer cases