Donor-to-recipient gender match in liver transplantation: A systematic review and meta-analysis

Table 1 Quality of studies evaluated by the modified Newcastle-Ottawa scale

Ref	Selection				Comparability		Outcome
	Case definition	Representativeness	Selection of controls	Definition of controls	Comparable for therapy	Comparable for etiology	Assessment of outcomes	Integrity of follow-up	Quality score
Kahn et al[17]	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	★★★★★★★★★
Marino et al[18]	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	★★★★★★★★★
Grande et al[19]	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	★★★★★★★★★
Berrevoet et al[20]	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	★★★★★★★★★
Brooks et al[21]	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	★★★★★★★★★
Croome et al[22]	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	★★★★★★★★★
Grat et al[23]	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	★★★★★★★★★