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Table 1 Participants’ characteristics

From: Assessing the reliability of FTIR spectroscopy measurements and validity of bioelectrical impedance analysis as a surrogate measure of body composition among children and adolescents aged 8–19 years attending schools in Kampala, Uganda

   Mean (95% Confidence Interval)
Characteristic Children (8–9 years) Young adolescents (10–14 years) Older adolescents (15–19 years) Overall
N 16 112 67 195
Male 7 51 26 84
Female 9 61 41 111
Age 8.34 (8.11 to 8.64) 11.80 (11.57 to 12.04) 17.39 (17.09 to 17.69) 13.44 (12.98 to 13.90)
Weight (kg) 28.31 (25.88 to 30.75) 40.40 (38.74 to 42.05) 55.55 (53.48 to 57.62) 44.61 (42.92 to 46.31)
Height (m) 1.31 (1.28 to 1.35) 1.48 (1.47 to 1.50) 1.62 (1.60 to 1.64) 1.51 (1.50 to 1.53)
BMI (kg/m2) 16.30 (15.65 to 16.95) 18.16 (17.69 to 18.63) 21.23 (20.53 to 21.93) 19.07 (18.64 to 19.50)
Waist circumference (cm) 58.56 (56.83 to 60.28) 65.07 (64.06 to 66.08) 68.94 (67.62 to 70.26) 65.87 (65.02 to 66.71)
Hip circumference (cm) 68.43 (66.25 to 70 .60) 79.20 (77.70 to 80.71) 91.32 (89.17 to 93.47) 82.48 (80.97 to 84.26)
Waist height ratio 0.44 (0.44 to 0.46) 0.44 (0.43 to 0.44) 0.43 (0.42 to 0.44) 0.44 (0.43 to 0.44)
Waist hip ratio 0.86 (0.84 to 0.88) 0.82 (0.82 to 0.83) 0.76 (0.74 to 0.78) 0.80 (0.80 to 0.81)
3 h deuterium enrichment (ppm) 722.86 (626.83 to 818.88) 796.77 (772.52 to 821.03) 790.85 (744.72 to 836.99) 788.67 (766.49 to 810.86)
4 h deuterium enrichment (ppm) 720.06 (622.18 to 817.94) 799.78 (775.74 to 823.83) 798.69 (753.26 to 844.11) 792.87 (770.84 to 814.89)
DDM Total body water (litres) 17.18 (15.90 to 18.47) 24.97 (24.07 to 25. 87) 32.05 (30.75 to 33.35) 26.76 (25.84 to 27.68)
DDM Total body water (%) 60.92 (59.38 to 62.47) 62.29 (61.44 to 63.14) 58.25 (56.21 to 60.28) 60.79 (59.90 to 61.68)
DDM Fat free mass (kg) 23.48 (21.72 to 25.23) 34.11 (32.88 to 35.34) 43.78 (42.00 to 45.56) 36.56 (35.30 to 37.82)
BIA Fat free mass (kg) 24.13 (22.10 to 26.16) 33.89 (32.72 to 35.06) 46.62 (45.05 to 48.19) 37.46 (36.13 to 38.79)
DDM Fat mass (kg) 4.84 (3.90 to 5.77) 6.29 (5.61 to 6.96) 11.77 (9.97 to 13.58) 8.05 (7.23 to 8.87)
BIA Fat mass (kg) 4.18 (3.48 to 4.88) 6.51 (5.80 to 7.22) 8.93 (7.54 to 10.32) 7.15 (6.50 to 7.81)
DDM Fat (%) 16.77 (15.65 to 16.95) 14. 90 (13.74 to 16.06) 20.43 (17.64 to 23.71) 16.95 (15.74 to 18.17)
BIA Fat (%) 14.61 (12.83 to 16.39) 15.34 (14.21 to 16.45) 15.42 (13.32 to 17.52) 15.30 (14.34 to 16.27)
Impedance 660.00 (626.16 to 693.84) 596.63 (581.35 to 611.90) 515.04 (500.91 to 529.16) 573.79 (561.67 to 585.92)