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Table 1 Patient and surgical characteristics stratified by whether the patient record contained a record of eGFR at 90 days postoperatively. Continuous variables are reported as median (IQR) and binary variables are reported as proportion (%)

From: A general approach to risk modeling using partial surrogate markers with application to perioperative acute kidney injury

  eGFR90 present eGFR90 missing
n 1268 3469
Age (year) 61 [51, 69] 64 [54, 71]
BMI (kg/m2) 29.14 [25.02, 33.80] 28.41[25.00, 32.72]
Hemoglobin (g/dL) 12.4 [10.5, 13.9] 13.3 [11.8, 14.6]
Diabetes 567 (44.7%) 1198 (34.5%)
Total urine output (mL) 450 [275, 725] 450 [300, 700]
Total fluids given (mL) 1600 [1000, 2200] 1750 [1100,2400]
Baseline eGFR 66.69 [47.06, 85.95] 74.52 [56.62, 90.24]
Max intraoperative lactate (mg/dL) 1.9 [1.2, 3.2] 1.6 [1.0, 2.6]
Length of surgery (min) 318 [260, 404.25] 301 [253, 368]
Emergency surgery 113 (8.9) 202 (5.8)