Table 5.

Comparison of REE calculated from predictive equation developed from all patients with measured REE during the acute (n = 294) and late phases (n = 180).

	kcal/day	Mean absolute % difference	Underestimation		Overestimation
			Mean % difference	>–10%	Mean % difference	> +10%
Measured REE during the acute phase = 1757 ± 431 kcal/day
Predictive Equation	1773 ± 284	15.1 ± 14.2	−12.1 ± 8.4(range: -36.8 to -1.1; n = 130)	69/294 (23.5%)	17.6 ± 17.1 (range: 0.1 to 113; n = 164)	94/294 (32.0%)
Measured REE during the late phase = 1886 ± 508 kcal/day
Predictive Equation	1807 ± 315	15.0 ± 13.1	−13.5 ± 8.6 (range: -39.2 to -0.04; n = 103)	60/180 (33.3%)	17.0 ± 17.2 (range: 0.06 to 79.4; n = 77)	40/180 (22.2%)

Acute phase, ≤5 days; late phase, ≥6 days; REE, resting energy expenditure.

Predictive Equation (all patients in the acute phase, n = 294) :891.6Ht + 9.0Wt + 39.7Ve – 5.6Age – 354.