High ligation of the inferior mesenteric artery during sigmoid colon and rectal cancer surgery increases the risk of anastomotic leakage: a meta-analysis

Table 2 Quality of non-randomized studies as assessed by the Newcastle–Ottawa Scale

Study	Year	Selection				Comparability	Outcome			Score
		1	2	3	4	1	1	2	3	(Max 9)
		(Max 1)	(Max 1)	(Max 1)	(Max 1)	(Max 2)	(Max 1)	(Max 1)	(Max 1)	(Max 9)
Corder AP	1992	*	*	*	*	*	*	–	*	7
Hall NR	1995	*	*	*	*	**	*	–	–	7
Komen N	2011	*	*	*	*	*	*	*	*	8
Sekimoto M	2011	*	*	*	*	*	*	–	*	7
Rutegard M	2012	*	*	*	*	*	*	*	*	8
Hinoi T	2013	*	*	*	*	**	*	*	–	8
Yamamoto M	2014	*	*	*	*	*	*	*	*	8
Bostrm P	2015	*	*	*	*	*	*	*	*	8
Huang J	2016	*	*	*	*	**	*	*	*	9
Rutegard M	2016	*	*	*	*	*	*	*	*	8
Yasuda K	2016	*	*	*	*	*	*	*	*	8
Zhang LY	2016	*	*	*	*	**	*	*	*	9
Zhang YD	2016	*	*	*	*	**	*	*	*	9
Mihara Y	2017	*	*	*	*	*	*	*	*	8

ISSN: 1477-7819