The role of remote ischemic preconditioning on postoperative kidney injury in patients undergoing cardiac and vascular interventions: a meta-analysis

Table 2 Methodological quality of trials included in meta-analysis

	Year	Randomization method	Blind	Explanation for withdrawals/drop outs	Jadad score	Allocation concealment	Intention-to-treat analysis
Ali et al. [16]	2007	Computer-generated random numbers	Single blind	Yes	3	Sealed envelopes	Yes
Hoole et al. [17]	2009	Computer-generated random numbers	Single blind	Yes	3	Sealed envelopes	No
Walsh et al. [18]	2009	Computer-generated random numbers	Unclear	Yes	3	Sealed envelopes	Yes
Walsh et al. [19]	2010	Computer-generated random numbers	Unclear	Yes	3	Sealed envelopes	Yes
Rahman et al. [20]	2010	Computer-generated random numbers	Double blind	Yes	5	Sealed envelopes	Yes
Choi et al. [21]	2010	Computer-generated randomization table	Unclear	Yes	3	Unclear	Yes
Thielmann et al. [22]	2010	Unclear	Single blind	Yes	2	Unclear	Yes
Zimmerman et al. [23]	2011	A block randomization generated by the study coordinator	Single blind	Yes	2	Sealed envelopes	Yes
Lucchinette et al. [24]	2012	Computer-generated random numbers	Unclear	Yes	3	Sealed envelopes	Yes
Young et al. [25]	2012	A block randomization using online randomization sequence generator	Double blind	Yes	5	Sealed envelopes	Yes

ISSN: 1749-8090