Comparison of overall survival and perioperative outcomes of laparoscopic pancreaticoduodenectomy and open pancreaticoduodenectomy for pancreatic ductal adenocarcinoma: a systematic review and meta-analysis

Table 2 Newcastle-Ottawa Scale for risk of bias assessment of the included studies

Study	Design	Selection				Comparability	Outcome			Total
Study	Design	Representativeness of exposed cohort	Selective of nonexposed Cohort	Ascertainment of exposure	Outcome not present at start	Comparability	Assessment of outcome	Adequate follow-up length	Adequacy of follow-up	Total
Croome	P	*		*	*	*	*	*	*	7
Speicher	R	*		*	*	*	*	*	*	7
Sharpe	R	*		*	*		*	*	*	6
Stauffer	P	*	*	*	*	*	*	*	*	8
Champman	R	*	*	*	*	*	*	*	*	8
Kantor	R	*	*	*	*	*	*	*	*	8
Chen	R	*	*	*	*	*	*	*	*	8
Dokmak	P	*		*	*	*	*	*	*	7

ISSN: 1471-2407