Bile leakage test in liver resection: A systematic review and meta-analysis

Table 3 Quality assessment of the included non-randomized controlled trials based on the Newcastle-Ottawa scale

Study	Selection star	Comparability star	Outcome star	Total star	Study quality
Li et al[12], (2009)	4	2	3	9	High
Suehiro et al[24], (2005)	3	2	3	8	High
Lam et al[2], (2001)	3	1	3	7	High
Leelawat et al[26], (2012)	4	2	3	9	High
Sakaguchi et al[27], (2010)	3	1	3	7	High