In a NICU, which data point best stratifies risk data?

• A. Birth weight
• B. Gestational age
• C. Apgar score at 5 minutes
• D. Maternal health status

Answer: (A)

In the NICU, birth weight is the most informative single factor for separating infants by risk because it directly reflects fetal growth and immaturity that drive neonatal complications. Infants with very low birth weight have a markedly higher risk of serious morbidities and death, so grouping data by weight creates clear distinctions in expected outcomes. While gestational age matters and can indicate maturity, infants with the same gestational age can vary greatly in size, and a smaller baby at the same age often faces greater vulnerability. Apgar scores at five minutes measure immediate condition at birth but don’t reliably predict longer-term risk across NICU stay, and maternal health status affects risk but doesn’t reflect the infant’s own vulnerability as precisely as size does. So birth weight provides the strongest, most consistent basis for stratifying neonatal risk data.