140 Chapter 7 Table 3. Body proportionality calculations to estimate body composition in preterm infants Author, year, country Predictor for body composition Reference method Study setting Subjects N° preterms Time of assessment Koo, 2004, United states of America Circumferences of head, chest, abdomen, midarm & midthigh Midarm & midthigh muscle and fat areas Total body weight Length DXA (Hologic QDR 1000/W densitometer, pediatric software version 5.64P) 120 preterm and term infants 52 (GA 30 - 36 weeks) 3 (+ 2.8) days postnatal age Daly-Wolfe, 2015, United States of America Mid-arm, mid-thigh, abdominal circumference ADP 56 preterm and term infants 28 (GA 33.3 + 0.9 weeks) Discharge home Pereira da Silva, 2009, Portugal Mid-arm circumference Upper armmuscle and fat areas (calculated from mid-arm circumference and triceps skinfold thickness) Regional adiposity measured by MRI 30 preterm infants 30 (GA 30.7 + 1.9 weeks) 35 + 1 weeks PMA Kiger, 2016, United States of America BMI Weight-for-length Ponderal index Body surface area Benn index ADP 239 preterm infants 239 (GA 28.1 [27.1 – 30.1] weeks) PMA < 50: median 37 (IQR 34 – 39) weeks PMA > 50: median 54 (IQR 52-65) weeks
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