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Table 2 Summary of quality indicators of non-randomised studies fulfilling inclusion criteria

From: A comparison of early versus late initiation of renal replacement therapy in critically ill patients with acute kidney injury: a systematic review and meta-analysis

Observational Study Sabater [33] Bagshaw [34] Gettings [15] Elahi [38] Demirkilic [13] Liu [21] Andrade [36] Wu [42] Manche [40] Iyem [39] Shiao [41] Carl [37] Bagshaw [35]
Were criteria for initiation of RRT clearly defined in each group? Yes Yes Yes Yes Yes Yes No Yes No Yes Yes Yes Yes
Was the measurement of criterion (or lab value) for initiation of RRT reliable? Yes Yes Yes Yes Yes Yes No Yes No No Yes Yes Yes
Was control group prospectively assembled? (vs historical, or case-control) Yes Yes No No No Yes No No No No Yes No Yes
Were control and intervention group comparable with respect to disease type and demographics? No No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Were the control and intervention group comparable with respect to disease severity? No No Yes Yes Yes No Yes Yes No Yes Yes Yes Yes
Was dialysis type comparable between groups in terms of dose, solution used, filtration vs dialysis, and type of membrane? No No Yes Yes No No No No No Yes Yes No No
Was there a description of withdrawals and dropouts? No Yes No Yes No No No No No No No No Yes