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Bland-Altman plots comparing fat-free mass (FFM) (kg) of 6-week-old males measured by PEA POD and from prediction equations based on weight (W) and (A) recumbent length (L) or (B) impedance index (L2/R50) with stepwise addition of gestational age (GA), birthweight SDS (BWSDS), subscapular skinfold thickness (SS), and abdominal circumference (AC).
