Infant Mortality Categorized by Birth Weight Percentiles for Deliveries Between 22 and 28 Weeks of Gestation.

· Birth weight ≥97th percentile was associated with increased infant mortality at 26 to 28 weeks.. · Higher birth weight percentiles were associated with a lower risk of mortality at 22 to 25 weeks.. · Lower birth weight percentiles were associated with a higher risk of mortality at 22 to 28 weeks..