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Table 1 SIDu (mEq/l) between different AKI stages at days 1, 2, 3 post admission.

From: Urinary strong ion difference and acute kidney injury: an early marker of renal dysfunction?

AKI stage
  3 2 1 0 Pvalue
Day 1 48.1 (21) 46 (22) 37.9 (20) 17.3 (22) <0.001
Day 2 40.2 (23) 45.9 (20) 45 (23) 29 (22) 0.004
Day 3 40.3 (26)` 47.2 (18) 53.2 (23) 31 (23) .006