Table 3.
Comparison of REE calculated from predictive equations developed from same patients with measured REE during the acute (n = 168) and late phases (n = 168).
| kcal/day | Mean absolute % difference | Underestimation | Overestimation | |||
|---|---|---|---|---|---|---|
| Mean % difference | > −10% | Mean % difference | > +10% | |||
| Measured REE during the acute phase = 1747 ± 429 kcal/day | ||||||
| Predictive Equation (Acute) | 1751 ± 275 | 15.2 ± 13.8 | −11.7 ± 8.5 (range: −33.6 to −0.04; n = 82) | 43/168 (25.6%) | 18.4 ± 16.8 (range: 0.13 to 96.1; n = 86) | 51/168 (30.4%) |
| Predictive Equation (Late) | 1887 ± 302 | 18.6 ± 17.7 | −10.3 ± 7.9 (range: −35.0 to −0.61; n = 55) | 26/168 (15.5%) | 22.7 ± 19.6 (range: 0.05 to 119.7; n = 113) | 77/168 (45.8%) |
| Measured REE during the late phase = 1865 ± 462 kcal/day | ||||||
| Predictive Equation (Acute) | 1759 ± 276 | 15.7 ± 12.1 | −14.2 ± 9.2 (range: −36.9 to −0.24; n = 106) | 67/168 (39.9%) | 18.3 ± 15.6 (range: 0.29 to 61.7; n = 62) | 38/168 (22.6%) |
| Predictive Equation (Late) | 1893 ± 313 | 14.7 ± 14.7 | −10.4 ± 8.8 (range: −41 to −0.05; n = 79) | 31/168 (18.5%) | 18.6 ± 17.6 (range: 0.27 to 77.3; n = 89) | 55/168 (32.7%) |
Acute phase, ≤5 days; late phase, ≥6 days; REE resting energy expenditure.
Predictive Equation (Acute):1627.8Ht + 25.3VeMax + 8.4Wt – 1830.3.
Predictive Equation (Late):1008.3 + 14.4Wt + 26.1VeMax – 7.9Age.