A) Length velocity (SDS) divided into tertiles, based on mean length
velocity (SDS) for each infant from 0-16 months, according to age. B) IGF-I (SDS)
divided into tertiles, based on mean IGF-I (SDS) for each infant from 0-16
months, according to age. Red, yellow and blue lines represent the lowest
tertiles, middle and highest tertiles, respectively.