We conducted the meta‐regressions of each of the outcomes according to the following databases. The codes used to identify each column of the databases were: trial name study ID cases1: number of events in the intervention group cases0 : number of events in the control group tot1: number of participants in the intervention group tot0: number of participants in the control group mean1: mean value in the intervention group SD1: standard deviation in the intervention group mean2: mean value in the control group SD 2: standard deviation in the control group dif: absolute difference in fluid overload between the control minus the intervention group. catpat: categories according the amount of fluid overload (FO) after randomisation between both group. mild: FO < 3 L (catpat0); moderate: FO 3 to < 6 L (catpat1) and severe: FO ≥ 6 L (catpat2) typepatient: participants with surgical‐AKI=1; participants with non related surgical AKI=0 modal.: KRT modality predominant continuous KRT= 1 and combined continuous + intermittent KRT.:=0 hipot.: percentage of patients with hypotension in early group minus percentage of patients with hypotension in standard group (%). See Appendix 7; Appendix 8; Appendix 9