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  • Title: Differential classification of infants in United States neonatal intensive care units for weight, length, and head circumference by United States and international growth curves.
    Author: Ferguson AN, Olsen IE, Clark RH, Yockey BD, Boardman J, Biron K, Jannuzzo C, Waskiewicz D, Mendoza A, Lawson ML.
    Journal: Ann Hum Biol; 2020 Sep; 47(6):564-571. PubMed ID: 32945183.
    Abstract:
    BACKGROUND: Clinicians and researchers use a variety of intrauterine growth curves to classify NICU infants as small (SGA), appropriate (AGA), or large for gestational age (LGA). Since curve creation methods and samples vary, SGA/AGA/LGA cut-offs and resulting subgroups of infants vary among curves and impact outcome study findings - limiting generalisability. AIM: Determine how two international and two US-specific curves classified US NICU infants. SUBJECTS AND METHODS: Classified 192,888 infants from US NICUs (2013-2016) as SGA or LGA for birthweight, length, and head circumference, using the international Fenton and INTERGROWTH-21st curves and US-specific Olsen and Lubchenco (historical) curves. RESULTS: Modern curves classified approximately 10% of infants as SGA up to 32 weeks, but older infants had increased variability. The INTERGROWTH-21st curves consistently had rates above 10% for LGA after 32 weeks. CONCLUSIONS: While Olsen and Fenton both fit, the Olsen curves had overall best-fit for our sample of US NICU infants. The INTERGROWTH-21st curves fit the definitions for SGA and LGA for younger ages, but inferences outside of these definitions are unwarranted due to limited sample size. The INTERGROWTH-21st sample used for 33 weeks and older infants was physically smaller at the upper percentiles than our sample of US infants.
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