serum concentrations of growth hormone , insulin , free thyroxine , thyrotropin , cortisol , and glucose were measured during four time periods ( 0 to 4 , 5 to 11 , 12 to 18 , and greater than or equal to 19 days of life ) in 16 mechanically ventilated very-low-birth-weight infants ( mean [ +/- sd ] birth weight , 1017 +/- 196 g ) receiving total parenteral nutrition and in 21 very-low-birth-weight infants not requiring mechanical ventilator support ( mean [ +/- sd ] gestational age , 30 +/- 1.7 weeks ; mean [ +/- sd ] birth weight , 1149 +/- 210 g ) fed enterally .
C0282666
very-low-birth-weight
C0005612
birth weight