Outcomes of extremely low-birth-weight infants between 500 and 750 g.

Objective: The purpose of this study was to describe morbidity, mortality, and developmental outcomes among extremely low-birth-weight infants (500-750 g).

Study Design: This retrospective cohort study included 167 live-born infants born at Long Beach Memorial Medical Center between January 1990 and December 1995.

Results: Mortality rates were 86% among infants <600 g and 44% among those > or =600 g, and the rate decreased with increasing gestational age.