BMI z-score as a prognostic factor for height velocity in children treated with recombinant human growth hormone due to idiopathic growth hormone deficiency.

Prepubertal idiopathic GHD children with BMI z-score below 0 would probably benefit from the improvement of their nutritional status prior to the rhGH treatment beginning. It seems that increasing BMI z-score to obtain values between 0 and 1 would be optimal for the growth process.