Tin et al reported a number of equations for estimating fat-free mass (FFM) in Asian neonates. The authors are from multiple institutions in Singapore, Australia, New Zealand, England, and Canada.
Patient selection: Asian neonate
Parameters:
(1) sex (1 if male, 0 ir female)
(2) weight in kilograms
(3) height in cm
(4) resistance in Ohms at 50 kHz (by BIA)
Equations at birth
fat-free mass in kg =
= (0.769 * (weight)) - (0.0475 * (points for sex)) + 0.478
fat-free mass in kg =
= (0.762 * (weight)) - (0.045 * (points for sex)) + (0.010 * ((height)^2) / (resistance)) + 0.459
Equation at 2 weeks
fat-free mass in kg =
= (0.621 * (weight)) - (0.016 * (points for sex)) + (0.112 * ((height)^2) / (resistance)) + 0.375
Equation at 6 weeks:
fat-free mass in kg =
= (0.584 * (weight)) - (0.142 * (points for sex)) + (0.002 * ((height)^2) / (resistance)) + 1.248
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