TABLE 1.

Composition of study formulas¹

Average content per 100 mL	PE-formula	S-formula
Energy (kcal)	100	67
Protein (g) (from cow milk)	2.6	1.4
Casein:whey (g)	1.0:1.6	0.6:0.8
Percentage of energy (protein:energy ratio)	10	8
Amino acids (mg)
l-Alanine	117	55
l-Arginine	83	46
l-Aspartic acid/l-asparagine	225	120
l-Cystine	39	22
l-Glutamic acid/l-glutamine	556	260
Glycine	52	27
l-Histidine	60	35
l-Isoleucine	159	74
l-Leucine	278	130
l-Lysine	257	120
l-Methionine	68	34
l-Phenylalanine	112	55
l-Proline	198	110
l-Serine	156	69
l-Threonine	169	73
l-Tryptophan	39	21
l-Tyrosine	107	44
l-Valine	169	82
Carbohydrates (g)	10.3	7.5
Percentage of energy	41	45
Fat (g) (from vegetable oil)	5.4	3.5
Percentage of energy	49	47

¹Adapted from de Betue et al (14) with permission from the BMJ Publishing Group Ltd. The PE-formula (Infatrini) and S-formula (Nutrilon 1) were from Nutricia Advanced Medical Nutrition. PE-formula, protein-energy–enriched enteral formula; S-formula, standard infant formula.