Table 1.

Interlaboratory CysC Differencesa

Mean Mayo Clinic CysC ± SD (range)Mean CHEO CysC ± SD (range)Mean Absolute Difference (95% CI)bMean % Difference (95% CI)c
Whole cohort (n = 94)1.58 ± 0.61 (0.65 to 3.82)1.41 ± 0.53 (0.63–3.15)−0.17 (−0.21, −0.13)d−9.9 (7.6, 12.2)d
CysC <1.41 mg/L (n = 47)1.14 ± 0.241.01 ± 0.19−0.12 (−0.17, −0.07)d−9.7 (−6.2, −13.1)d
CysC ≥1.41 mg/L (n = 47)2.03 ± 0.531.81 ± 0.44−0.22 (−0.29, −0.16)d−10.1 (−7.0, −13.2)d
  • a Expressed as mg/L.

  • b Absolute difference = CHEO CysC − Mayo Clinic CysC.

  • c % difference = (CHEO CysC − Mayo Clinic CysC)/Mayo Clinic CysC × 100.

  • d P < 0.0001.