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Table 2 Clinical variables of the patients in the automatic urinometer group and the manual urinometer groupa

From: Performance and user evaluation of a novel capacitance-based automatic urinometer compared with a manual standard urinometer after elective cardiac surgery

Variable AU (n = 18) MU (n = 16) P -value
Female sex, % 28 50 0.29
Age, yr 68.0 (64.3 to 75.5) 66.5 (63.5 to 73.5) 0.75
Weight, kg 79.2 ± 15.3 80.3 ± 7.9 0.83
Height, cm 174 ± 5.8 172 ± 9.8 0.48
BMI, kg/m2 1.9 ± 0.2 2.0 ± 0.2 0.74
EuroSCORE II, % 1.7 (0.9 to 2.6) 1.6 (0.9 to 3.1) 0.85
Preoperative albumin, g/L 39.0 (36.0 to 40.3) 38.0 (36.0 to 39.8) 0.60
Preoperative creatinine, μmol/L 82.5 (67.8 to 97.8) 86.5 (62.5 to 100) 0.83
Preoperative eGFR, ml/min 78.0 (62.4 to 104) 75.4 (67.8 to 89.4) 0.91
IDDM, % 6 6 1.00
COPD, % 6 6 1.00
LVEF <50%, % 33 31 1.00
Surgical procedures    
 CABG, % 28 25 1.00
 Single-valve replacement, % 44 44 1.00
 Valve + CABG, % 11 19 0.65
 Others, % 17 13 1.00
ECC, min 84.5 (71.5 to 133) 79.5 (67.0 to 127) 0.56
ICU stay, hr 22.5 (18.8 to 25.0) 23.0 (18.5 to 25.3) 0.77
Ventilation time in ICU, hr 3.0 (1.0 to 4.3) 2.5 (1.0 to 4.8) 0.96
Inotropes in ICU, % 0 6 0.47
  1. aAU, Automatic urinometer; BMI, Body mass index; CABG, Coronary artery bypass graft; COPD, Chronic obstructive pulmonary disease; ECC, Extracorporeal circulation; eGFR, Estimated glomerular filtration rate (Cockcroft-Gault equation); EuroSCORE, European System for Cardiac Operative Risk Evaluation [8]; ICU, Intensive care unit; IDDM, Insulin-dependent diabetes mellitus; LVEF, Left ventricular ejection fraction; MU, Manual urinometer. Data are presented as percentages, medians (25th to 75th percentile range) or means ± standard deviation.