Table 2.

Modify: Newcastle–Ottawa Scale (NOS) quality assessment

Study	Selection				Comparability		Outcome
	Representative-ness	Selection of non-exposed	Ascertainment of exposure	Outcome not present at start	Comparability on most important factors	Comparability on other risk factors	Assessment of outcome	Long enough follow-up	Adequacy (completeness) of follow-up	Score
(Córdova-Sánchez, Herrera-Gómez et al. 2016) [5]	*	*	*	-	*	*	*	*	*	********
(Córdova-Sánchez, Ruiz-García et al. 2019) [6]	*	*	*	-	*	*	*	*	*	********
(Darmon, Vincent et al. 2015) [7]	*	*	*	-	*	*	*	*	*	********
(Kemlin, Biard et al. 2018) [8]	*	*	*	-	*	*	*	*	*	********
(Libório, Abreu et al. 2011) [9]	*	*	*	-	*	*	*	*	*	********
(Seylanova, Crichton et al. 2020) [10]	*	-	*	-	-	-	*	*	*	*****
(Soares, Lobo et al. 2010) [11]	*	-	*	-	-	-	*	*	*	*****
(Soares, Salluh et al. 2006) [12]	*	-	*	-	-	-	*	*	*	*****
(Cheng, Nie et al. 2019) [13]	*	*	*	-	*	*	*	*	*	********
(Cho, Kang et al. 2019) [14]	*	-	*	-	-	-	*	*	*	*****
(Christiansen, Johansen et al. 2011) [15]	*	-	*	-	-	-	*	*	*	*****
(Kang, Park et al. 2019) [16]	*	-	*	-	-	-	*	*	*	*****
(Lahoti, Kantarjian et al. 2010) [17]	*	*	*	-	*	*	*	*	*	********
(Li, Wang et al. 2021) [18]	*	*	*	-	*	*	*	*	*	********
(May, Barreto et al. 2021) [19]	*	*	*	-	*	*	-	*	*	*******
(Abdeljaleel et al. 2022) [20]	*	*	*	-	*	*	*	*	*	********
(Nowshad, Alam et al. 2010) [21]	*	*	*	-	*	*	*	*	*	********
(Rainone, Merlino et al. 2013) [22]	*	*	*	-	*	*	*	*	*	********
(Salahudeen, Doshi et al. 2013) [23]	*	*	*	-	*	*	*	*	*	********
(Shen, Wang et al. 2020) [24]	*	*	*	-	*	*	*	*	*	********
He Xiaoqin [25]	*	-	*	-	-	-	*	*	*	*****
Li Yuejia [26]	*	*	*	-	*	*	*	*	*	********
Liu Shuiying, et al. [27]	*	*	*	-	*	*	*	*	*	********
Peng Zhangjing [28]	*	*	*	-	*	*	*	*	*	********

^*indicates criterion met,—indicates significant of criterion not met