“As in adults, the BMR (Basal Metabolic Rate) in children is generally the largest component of the requirement. Because of differences in the timing of the pubertal growth spurt, both weights and heights at any given age are rather variable. For example, in 12-year-old boys, weight may vary from 28 kg (3rd centile) to 59 kg (97th centile), and height from 1.36 to 1.64 m. The best predictor of the BMR is weight and, as in adults, the BMR per kg varies with body weight. At any given weight, variations in height make no difference in boys and only a small difference in girls (at a given weight the predicted BMR changes by less than 5% as one moves from the median height to the 3rd or 97th centiles, Annex 1). As discussed in section 3.5.1, the BMR may be estimated either from the actual weight or from the median weight for height and age, as shown in Baldwin's table (Annex 2(B))