Mortality of critical care interventions in the COVID-19: A systematic review

Table 1 Studies included in a systematic review of mortality and critical care interventions in coronavirus disease 2019

Ref.	Data available					Newcastle-Ottawa quality scale
	Intensive care	Mechanical ventilation	Hemodialysis	ECMO	CPR
Bhatraju et al[6]	X	X				4
Shao et al[18]					X	6
Arentz et al[22]	X					4
Cai et al[23]	X	X				6
Cao et al[24]	X	X	X			6
Chen et al[25]	X					5
Grasselli et al[26]	X					5
Han et al[27]	X					7
Huang et al[28]	X					7
Intensive Care National Audit and Research Centre[29]	X	X	X			5
Li et al[30]	X	X		X		4
Ling et al[31]	X	X				6
Wang et al[32]	X	X				7
Wang et al[33]	X		X			7
Wang et al[34]	X	X				6
Wu et al[35]	X	X				6
Yang et al[36]	X	X	X	X		7
Zhou et al[37]	X	X	X			7
Deng et al[38]		X				6
Grein et al[39]		X				5

ECMO: Extracoropreal membrane oxygenation; CPR: Cardiopulmonary resuscitation.