Bland-Altman plots whereby resting energy expenditure (REE) based on volumetric carbon dioxide production (VCO2) measurements (REEVCO2) using different RQ values are compared to REE measured by indirect calorimetry (IC) (REEIC) at ICU Day-1. Solid lines indicate the bias (kcal/day) and the light shades with the fine dotted lines indicate the limits of agreement (bias ± (1.96 x SD) = precision). Dark shades represent the 95% confidence intervals of the mean (bias). A. REEVCO2 RQ 0.89 assuming RQ of 0.89 compared to REEIC. B. REEVCO2 RQ 0.85 assuming RQ of 0.85 compared to REEIC. C. REEVCO2 RQ 0.80 assuming RQ of 0.80 compared to REEIC. D. REEVCO2 RQ IC using individual RQ values calculated by IC compared to REEIC.