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Table 3 Relationship between KDIGO stage and risk categories of the Cleveland tool

From: Validating a scoring tool to predict acute kidney injury (AKI) following cardiac surgery

  No AKI (N = 1980) KDIGO stage 1 (N = 142) KDIGO stage 2 (N = 60) KDIGO stage 3 (N = 134)
Overall mean (SD) risk score 1.61 (1.59) 2.34* (1.68) 2.35* (1.66) 3.69*,& (2.07)
Cleveland risk category N (%) N (%) N (%) N (%)
Low risk (0–2; n = 1659) 1503 (90.6%) 82 (4.9%) 32 (1.9%) 42 (2.5%)
Intermediate risk (3–5; n = 576) 429 (74.4%) 55 (9.5%) 25 (4.3%) 68 (11.8%)
High risk (6–8; n = 75) 47 (59.5%) 5 (6.3%) 3 (3.8%) 24 (30.4%)
Very high risk (≥9; n = 1) 1 (100%) 0 0 0
  1. Abbreviations: AKI acute kidney injury, KDIGO kidney disease: improving global outcomes, SD standard deviation.
  2. *significantly different from No AKI (p < 0.05, Bonferonni).
  3. &significantly different from Stage 1 (p < 0.05, Bonferonni).