Laparoscopic versus open approach in gastrectomy for advanced gastric cancer: a systematic review

Table 1 Assessment of quality of non-RCT studies (NOS)

References		Selection				Comparability		Outcome
References	Year	REC	SNEC	AE	DO	SC	AF	AO	FU	FUO	Score
Zhang et al. [40]	2017	*	*	*	*	*		*	*	*	8
Xu1 et al. [39]	2017	*	*	*	*	*	*	*	*	*	9
Lu et al. [37]	2016	*	*	*	*	*	*	*	*	*	9
Hao et al. [33]	2016	*	*	*	*	*		*	*	*	8
Zhang et al. [32]	2015	*	*	*	*	*		*	*	*	8
Wu et al. [31]	2015	*	*	*	*	*				*	6
Gordon et al. [25]	2013	*	*	*		*	*	*	*	*	8
Bo et al. [24]	2013	*	*	*	*	*	*	*	*	*	9
Chun et al. [20]	2012	*	*	*	*	*		*	*	*	8
Chen et al. [19]	2012	*	*	*	*	*	*	*	*	*	9
Zhao et al. [18]	2011	*	*	*	*	*		*	*	*	8
Shuang et al. [17]	2011	*	*	*	*	*		*	*	*	8
Shinohara et al. [27]	2013	*	*	*	*	*	*	*	*	*	9
Li3 et al. [42]	2018	*	*	*	*	*	*	*	*	*	9
Chan et al. [45]	2019	*	*	*	*	*	*	*	*	*	9
Fang et al. [28]	2014	*	*	*	*	*	*	*	*	*	9
Xu2 et al. [49]	2018	*	*	*	*	*	*	*	*	*	9
Huang et al. [14]	2010	*	*	*	*	*	*				6
Hamabe et al. [21]	2012	*	*	*	*	*	*	*	*	*	9
Scatizzi et al. [16]	2011	*	*	*	*	*		*	*	*	8
Inokuchi et al. [41]	2018	*	*	*	*	*	*	*	*	*	9
Li¹ et al. [35]	2016	*	*	*	*	*	*				6
Zhang et al. [38]	2016	*	*	*	*	*	*	*	*	*	9
Kinoshita et al. [46]	2019	*	*	*	*	*	*	*	*	*	9
Kim et al. [22]	2012	*	*	*		*	*	*	*	*	8
Moisan et al. [23]	2012	*	*	*	*	*		*	*	*	8
Qiu et al. [29]	2014	*	*	*	*	*	*				6
Lin et al. [26]	2013	*	*	*	*	*	*	*	*	*	9

REC representativeness of the exposed cohort, SNEC selection of the non-exposed cohort, AE ascertainment of exposure, DO demonstration that outcome of interest was not present at start of study, SC study controls for age and sex, AF study controls for any additional factors, AO assessment of outcome, FU follow-up long enough for outcomes to occur, FUO adequacy of follow-up of cohorts

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