Table 3.

Comparison of true to estimated baseline serum creatinine

Baseline SCr (mg/dl) Estimation MethodsSerum Creatininea [median (IQR)]Absolute % Error [median (5th, 95th percentile)]
Critically ill group (n = 109)
    True baseline SCr0.3 (0.2)
    Estimated from eCCl1000.6 (0.4)b+50% (−20%, +220%)
    Estimated from eCCl1200.5 (0.4)b+25% (−33%, +165%)
    AdmSCr0.4 (0.8)b0% (0, +240%)
    NormsMin0.3 (0.6)0% (−50%, +200%)
    NormsMax0.5 (0.6)b+50% (−25%, +300%)
Noncritically ill group (n = 261)
    True baseline SCr0.3 (0.2)
    Estimated from eCCl1000.6 (0.3)b+67% (−2.4%, +218%)
    Estimated from eCCl1200.5 (0.2)b+39% (−19%, +165%)
    NormsMin0.3 (0.6)b0% (−67%, +300%)
    NormsMax0.5 (0.6)b+60% (−50%, +350%)
  • a To convert to SI units, multiply by 88.4.

  • b Estimated SCr significantly different from true baseline SCr (P < 0.001, Wilcoxon matched-pairs test).