Table 3.

Agreement between estimation method and adjudicated reference standard stratified by CKD status and number of preadmission serum creatinine values available

Estimation MethodICC (95% CI)
eGFR < 60 ml/min per 1.73 m2 (n=259)eGFR ≥ 60 ml/min per 1.73 m2 (n=120)0–6 Creatinine Measurements (n=142)6–14 Creatinine Measurements (n=111)14–93 Creatinine Measurements (n=126)
Most recent outpatient0.80 (0.74–0.85)0.58 (0.42–0.70)0.87 (0.80–0.91)0.93 (0.89–0.95)0.80 (0.71–0.86)
Mean outpatient0.87 (0.83–0.90)0.75 (0.65–0.83)0.91 (0.87–0.94)0.95 (0.93–0.97)0.88 (0.83–0.91)
Nadir outpatient0.76 (0.66–0.83)0.65 (0.48–0.76)0.89 (0.84–0.93)0.93 (0.83–0.96)0.76 (0.61–0.85)
Most recent inpatient or outpatient0.85 (0.81–0.88)0.65 (0.53–0.75)0.89 (0.85–0.92)0.92 (0.88–0.94)0.86 (0.80–0.90)
  • CKD status was defined using the baseline adjudicated creatinine value. ICC, intraclass correlation coefficient; CI, confidence interval; eGFR, estimated GFR.