2. Sensitivity analyses.

Sensitivity analysis	Measure	Risk ratio (95% CI)
Robustness against risk of bias in individual studies	Excluding studies with high risk of bias (Bernard 2002; Mori 2000)	1.29 (1.04 to 1.60)
Robustness against methods of the intervention	Pooling with studies using haemofiltration (Laurent 2005)	1.35 (1.09 to 1.67)
Robustness against model choice	Using fixed‐effect model instead of random‐effects model	1.09 (1.02 to 1.18)
Robustness against including converted data	Excluding converted study data from a continuous outcome (Zhang 2005)	1.33 (1.07 to 1.65)

CI: confidence interval.