Risk factors for absence of catch-up growth in small for gestational age very low-birthweight infants.

Background Many small for gestational age (SGA) infants have catch-up growth during the first 2 years of life, but approximately 10% have no catch-up growth, and short stature continues into adulthood. Identification of risk factors for absence of catch-up growth at an early age may be useful for earlier diagnosis and earlier treatment. Methods This was a retrospective multicenter study. The subjects were SGA infants with very low-birthweight (VLBW), who were followed up until the age of 3 years. The risk factors for absence of catch-up growth were identified on statistical analysis. Results Of the 217 SGA infants in this study, 181 were in the catch-up group and 36 were in the no catch-up group. The catch-up rate was 83%. On multivariate analysis adjusted for gestational age, birthweight, birth height, and birth head circumference, multipara, Z and Delta Z scores of length at 12 months of corrected age, and the Z score of height at 24 months of corrected age were risk factors for lack of catch-up at 3 years. Conclusions The length Z and Delta Z scores at 12 months of corrected age may be useful for an earlier diagnosis and earlier initiation of growth hormone treatment in VLBW infants.