Different techniques for harvesting grafts for living donor liver transplantation: A systematic review and meta-analysis

Table 2 Quality of case-controlled studies evaluated with modified Newcastle-Ottawa scale

Ref.	Case definition	Selection		Definition of controls	Comparability		Outcomes		Quality score
		Represen- tativeness	Selection of controls		Comparable for 1, 2, 3	Comparable for 4, 5	Ascertainment of exposure	Non-response
Baker et al[13], 2009	Yes	No	Yes	Yes	Yes	4	Yes	Yes	7
Kim et al[14], 2009	Yes	No	Yes	Yes	Yes	4	Yes	Yes	7
Kim et al[18], 2011	Yes	No	Yes	Yes	1, 3	Yes	Yes	Yes	6
Thenappan et al[15], 2011	Yes	No	Yes	Yes	No	No	Yes	Yes	7
Zhang et al[24], 2014	Yes	No	Yes	Yes	Yes	4	Yes	Yes	7

1 = gender; 2 = body max index; 3 = graft generation; 4 = age; 5 = haemoglobin.