Table 4. Summary of significant variables for risk of RRT.

Variable	HR (95% CI)	p-value
Significant risk for RRT prior to first AKI
Baseline age (years)	0.97 (0.95, 0.99)	0.01
Base hospital (tertiary centre)	0.45 (0.21, 0.96)	0.04
Significant risk for RRT prior to second AKI
First AKI (stage 2/3)	14.46 (9.56, 21.87)	<0.001
Baseline age (years)	0.99 (0.98, 1.00)	0.01
Base hospital (tertiary centre)	0.44 (0.31 0.62)	<0.001
Primary renal disease polycystic kidneys	2.11 (1.33, 3.33)	<0.001
Primary renal disease pyelonephritis	2.29 (1.28, 4.07)	0.01
Significant risk for RRT prior to third or more AKI
Second AKI (stage 2/3)	28.39 (9.71, 83.00)	<0.001
Base hospital (tertiary centre)	0.34 (0.16, 0.73)	0.01
Diabetes (type I/II)	0.22 (0.06, 0.89)	0.03