Table 5.

AKI events identified by billing codes, serum creatinine, and combined creatinine and urine output criteria: in-hospital and 30-day mortality

VariableBilling Code AKIAKIcrAKIcr_uop
In-hospital mortality
 AKI (%)41.218.712.8
 No AKI (%)
 Odds ratio (95% CI)17.1 (10.0 to 29.1)8.6a (5.6 to 13.1)6.8a (4.3 to 10.7)
30-day mortality
 AKI (%)51.823.918.6
 No AKI (%)
 Odds ratio (95% CI)12.1 (7.4 to 19.8)4.2a (3.0 to 5.9)3.6a (2.6 to 4.9)
  • Electronic medical record sample. AKIcr, AKI by the creatinine-based criteria; AKIcr_uop, AKI by the creatinine- or urine output–based criteria; 95% CI, 95% confidence interval.

  • a P<0.05 for comparison with coefficient for billing code AKI.