The effect of the time interval between coronary angiography and on-pump cardiac surgery on risk of postoperative acute kidney injury: a meta-analysis

Table 2 Assessment of study quality

Study	Quality indicators from the Newcastle-Ottawa scale									Score
	Selection				Comparability		Exposure/Outcome
	1	2	3	4	5a	5b	6	7	8
Ranucci [14]	Yes	Yes	No	Yes	No	No	Yes	Yes	Yes	6
Ko [9]	Yes	Yes	No	Yes	No	No	Yes	Yes	Yes	6
Mcllroy [21]	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	8
Greason [11]	Yes	No	No	Yes	Yes	Yes	Yes	Yes	Yes	7
Andersen [10]	Yes	Yes	No	Yes	No	Yes	Yes	Yes	Yes	7
Mehta [22]	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	8
Medalion [17]	Yes	Yes	No	Yes	Yes	No	Yes	Yes	Yes	7
Hennessy [16]	Yes	No	No	Yes	Yes	Yes	Yes	Yes	Yes	7
Del Duca [15]	No	Yes	No	No	Yes	Yes	Yes	Yes	Yes	6

ISSN: 1749-8090