Systematic review of anastomotic complications of esophagojejunostomy after laparoscopic total gastrectomy

Table 2 Quality assessment of non-randomized controlled trials based on the Newcastle-Ottawa scoring system

	Selection				Comparability1	Exposure
Author	Is the case definition adequate?	Representativeness of the cases	Selection of controls	Definition of controls	of cases and controls on the basis of the design or analysis	Ascertainment of exposure	Same method of ascertainment for cases and controls	Non-responserate
Kim et al[27]	*	*			**	*	*	*
Topal et al[28]	*	*			**	*	*	*
Kawamura et al[29]	*	*			**	*	*	*
Sakuramoto et al[30]	*	*			**	*	*	*
Kim et al[31]	*	*			**	*	*	*
Arrington et al[32]	*	*			**	*	*	*
Eom et al[33]	*	*			**	*	*	*
Siani et al[34]	*	*			**	*	*	*
Bo et al[35]	*	*			**	*	*	*
Guan et al[36]	*	*			**	*	*	*
Jeong et al[37]	*	*			*	*	*	*
Kim et al[38]	*	*			**	*	*	*
Lee et al[39]	*	*			**	*	*	*
Shim et al[40]	*	*			**	*	*	*
Lee et al[41]	*	*			**	*	*	*
Matsuda et al[42]	*	*			**	*	*	*

¹Controls selected on the basis of the extent of lymphadenectomy and reconstruction procedure (maximum, 2 stars).