Table 3.

Comparison between body composition parameters estimated by air displacement plethysmography (ADP) and dual x-ray absorptiometry (DXA) among body mass index classification groups. Data presented in medians and percentiles. P values presented from Wilcoxon Signed Ranks analysis.

	Normal Weight (n=55)			Overweight (n=24)			Obese (n=16)			Extreme Obese (n=14)
	ADP	DXA	P value	ADP	DXA	P value	ADP	DXA	P value	ADP	DXA	P value
Body weight, kg	61.5 (55.6,66.8)	61.5 (55.8,66.6)	.001	79.0 (73.9,87.2)	79.3 (73.4,87.7)	.016	93.8 (82.2,98.2)	92.0 (82.2,98.5)	.215	115.7 (109.0,123.8)	115.7 (109.1,123.0)	.470
Fat free mass, kg	46.3 (42.4,52.9)	42.9 (41.0,52.0)	.000	56.5 (49.1,65.5)	55.4 (47.5,63.3)	.001	49.1 (41.8,54.7)	48.5 (43.9,53.4)	.836	53.5 (51.0,56.2)	55.4 (52.2,58.8)	.022
Fat mass, kg	13.2 (10.5,16.9)	14.9 (11.3,19.3)	.000	21.3 (18.7,26.6)	23.8 (21.3,27.1)	.000	42.6 (34.6,49.3)	42.0 (35.8,47.9)	.469	62.8 (50.1,66.0)	60.7 (55.8,63.5)	.004
Body Fat, %	21.6 (18.4,27.2)	24.9 (19.4,31.1)	.000	26.6 (20.9,34.1)	30.5 (23.9,35.7)	.000	46.2 (41.7,52.5)	48.0 (43.8,49.1)	.796	54.6 (52.6,55.7)	51.9 (50.1,51.9)	.009