Comparing very low birth weight versus very low gestation cohort methods for outcome analysis of high risk preterm infants

摘要

BackgroundCompared to very low gestational age (<32 weeks, VLGA) cohorts, very low birth weight (<1500 g; VLBW) cohorts are more prone to selection bias toward small-for-gestational age (SGA) infants, which may impact upon the validity of data for benchmarking purposes.