123 DXA, ADP & SFT in preterm infants 6 both ADP and DXA, fat mass and fat mass percentage at term age did not differ significantly between gender, ethnicity or type of nutrition at term age. Table 2. Body composition at term equivalent age Total N = 65 Male N = 35 Female N = 30 p-valuea Sum of skinfolds (mm)b, mean + SD 22.4 + 4.2 22.4 + 4.4 22.5 + 4.1 0.872 Waist circumference (mm)c, median (IQR) 36.0 (34.0 – 37.5) 36.5 (34.5 – 37.8) 35.4 (33.3 – 37.0) 0.167 ADP fat mass (grams)d, mean + SD 864 + 253 910 + 280 799 + 198 0.100 DXA fat mass (grams)e, mean + SD 1078 + 417 1187 + 475 1012 + 376 0.258 ADP fat mass percentage, median (IQR) 20.7 (18.4 – 23.0) 21.2 (18.4 – 23.4) 20.4 (18.1 – 22.6) 0.594 DXA fat mass percentage, median (IQR) 25.0 (21.5 – 30.5) 25.1 (22.4 -31.8) 24.8 (19.8 – 29.5) 0.684 ADP fat-free mass (grams), mean + SD 3309 + 462 3447 + 430 3114 + 442 0.006 DXA fat-free mass (grams), mean + SD 3138 + 400 3316 + 422 3032 + 356 0.051 ADP fat-free mass percentage, median (IQR) 79.3 (77.1 – 81.6) 78.8 (76.6 – 81.7) 79.7 (70.5 – 81.9) 0.594 DXA fat-free mass percentage, median (IQR) 75.1 (69.6 – 78.5) 74.9 (68.2 – 77.7) 75.2 (70.5 – 80.2) 0.686 a: p-value for females compared to males based on t-test for normal distributions, Mann-Whitney U test for non-parametric variables and Pearson chi-square or Fisher’s exact test for categorical variables. b: Sum of skinfolds measured at biceps, triceps, subscapular and supra-iliac positions, n = 63 (34 male, 39 female) c : Waist circumference, n = 63 (34 male, 39 female) d : ADP, n = 58 (34 male, 24 female) e : DXA, n = 32 (12 male, 24 female) ADP: air displacement plethysmography, DXA: Dual-energy x-ray, IQR: interquartile range, SD: standard deviation
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