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Table 3 Accuracy of energy expenditure based on CO2 measurements (EEVCO2) versus energy expenditure (EE) measured by indirect calorimetry according to the timing of evaluation and energy provision rate at the time of evaluation

From: Can calculation of energy expenditure based on CO2 measurements replace indirect calorimetry?

  n EEVCO2_0.85 EEVCO2_FQ
±5% EE (%) p value ±5% EE (%) p value
Timing of evaluation ≤7 ICU day 131 58 44 0.577 59 45 0.667
>7 ICU day 147 70 48 70 48
Energy provision <90% EE 139 65 47 0.810 63 45 0.718
≥90% EE 139 63 45 66 47
  1. Timing of evaluation: patient stratification by measurements before or after the 7th day after ICU admission, Energy provision: patient stratification according to the proportion of energy provision at the time of measurement < 90 or ≥ 90% of EE, ±5%.
  2. EEVCO 2 _0.85 EE calculated using measured CO2 consumption (VCO2) and fixed respiratory quotient (RQ) of 0.85, EEVCO 2 _FQ EE calculated using measured VCO2 and the food quotient (FQ) as the RQ, EE number of patients with EEVCO2 values within ±5% of EE, P values: chi-square tests