Table 2 Proposed equations for estimating fat mass (kg) in infants at 1, 3, and 6 months of age, using air displacement plethysmography as the reference method.

From: Development and validation of anthropometric-based fat-mass prediction equations using air displacement plethysmography in Mexican infants

Age

Prediction Equation

1 month

FM (kg) = 0.068(TC) + 0.018(BMI) + 0.026(WSF) + 0.01(ThSF) + 0.009(SSF) − 1.082

3 months

FM (kg) = 0.006(WC) + 0.074(TC) + 0.078(CC) + 0.062(BMI) + 0.024(CSF) + 0.054(SSF) − 0.062(TSF) − 0.053(gestational age at birth) − 1.045

6 months

FM (kg) = 0.030(TC) + 0.163(CC) + 0.023(WSF) + 0.034(ThSF) + 0.019(SSF) − 0.050(gestational age at birth) − 0.858

  1. FM Fat mass, BMI Body mass index in cm/m2, WC Waist circumference in cm, TC Thigh circumference in cm, CC Calf circumference in cm, TSF Triceps skinfold in mm, SSF Subscapular skinfold in mm, WSF Waist skinfold in mm, ThSF Thigh skinfold in mm, CSF Calf skinfold in mm, Gestational age at birth: in weeks.
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