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Table 2 Precision and bias of VO2 (ml/min), VCO2 (ml/min) and REE (kcal/24 h) between methods

From: Measuring energy expenditure in the intensive care unit: a comparison of indirect calorimetry by E-sCOVX and Quark RMR with Deltatrac II in mechanically ventilated critically ill patients

Comparison Mean Bias Precision (bias ±2 SD) PE (±2 SD/mean)
VO2: E-sCOVX–Deltatrac 310 +27 –44 to +98 ±23
VO2: Quark RMR–Deltatrac 301 +25 –49 to +98 ±24
VCO2: E-sCOVX–Deltatrac 245 +37 –8 to +83 ±19
VCO2: Quark RMR–Deltatrac 238 +40 –11 to +90 ±21
REE: E-sCOVX–Deltatrac 2148 +215 –246 to +675 ±21
REE: Quark RMR–Deltatrac 2088 +205 –260 to +670 ±22
REE: 20 kcal/kg/24 h Deltatrac 1754 –559 –1199 to 81 ±36
REE: HBE* Deltatrac 1773 –371 –926 to +183 ±31
  1. * Revised Harris-Benedict equation. N = 46
  2. PE percentage error, REE resting energy expenditure, SD standard deviation, VCO 2 carbon dioxide production, VO 2 oxygen consumption