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Table 2 Comparison of energy expenditure based on CO2 measurements (EEVCO2) to energy expenditure (EE) measured by indirect calorimetry in mean bias and accuracy rates

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

  Mean, SD Mean bias 95% CI SD of bias p value Accuracy rates (%)
(kcal/d) (kcal/d) Lower, upper 5% 10%
EEVCO2_0.85 1936, 441 -21 -41, 1 171 0.042 46.0 77.7
EEVCO2_FQ 1908, 439 -48 -67, -28 163 0.000 46.4 77.3
  1. Mean bias mean difference between EEVCO2 and measured EE, p values: paired Student t tests, accuracy rates proportion of EEVCO2 values within 5% or 10% of the measured EE
  2. SD standard deviation, CI confidence intervals, 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 VCO2 and the food quotient as the RQ