Comparison 4. Subgroup analysis: recovery of kidney function.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
4.1 Recovery of kidney function by AKI aetiology	10		Risk Ratio (M‐H, Random, 95% CI)	Subtotals only
4.1.1 AKI related to non‐surgical causes	7	4352	Risk Ratio (M‐H, Random, 95% CI)	1.00 [0.91, 1.11]
4.1.2 AKI related to surgical causes	3	365	Risk Ratio (M‐H, Random, 95% CI)	1.36 [0.78, 2.38]
4.2 Recovery of kidney function by definition of early KRT Initiation	8		Risk Ratio (M‐H, Random, 95% CI)	Subtotals only
4.2.1 Initiation according KDIGO stage 2	3	3258	Risk Ratio (M‐H, Random, 95% CI)	1.08 [0.86, 1.36]
4.2.2 Initiation according KDIGO stage 3/RIFLE‐F AKIN	2	1107	Risk Ratio (M‐H, Random, 95% CI)	1.00 [0.88, 1.13]
4.2.3 Initiation according to other criteria	3	218	Risk Ratio (M‐H, Random, 95% CI)	1.55 [0.95, 2.53]
4.3 Recovery of kidney function by KRT modality	10		Risk Ratio (M‐H, Random, 95% CI)	Subtotals only
4.3.1 Continuous KRT	6	583	Risk Ratio (M‐H, Random, 95% CI)	1.42 [0.99, 2.03]
4.3.2 Continuous and intermittent KRT	4	4134	Risk Ratio (M‐H, Random, 95% CI)	0.96 [0.91, 1.02]