Establishment of Prediction Equations of Lean Body Mass Suitable for Chinese Adults

Table 2

Comparison between LBM_PE and LBM_DXA in the validation subjects (n = 1,511).

	Groups	n	LBM_P (kg)	LBM by equations for subgroups (kg)	LBM_DXA (kg)	Bias		95%	R^2	SEE
Males	All	395	50.87±7.46	/	50.82±7.53	0.05±3.42	0.756	-6.6, 6.8	0.803	3.35
	Underweight	25	42.99±2.87	42.88±2.72	43.59±3.33	-0.59±2.16	0.183	-4.8, 3.6	0.790	2.18
	Normal weight	245	48.06±3.97	48.02±4.02	48.24±5.22	-0.17±3.16	0.387	-6.4, 6.0	0.734	3.16
	Overweight	125	58.06±7.91	57.93±7.48	57.33±7.61	0.73±3.97	0.062	-7.0, 8.5	0.757	3.77
Females	All	1,116	36.92±4.38	/	36.95±4.83	-0.03±2.50	0.669	-4.9, 4.9	0.734	2.49
	Underweight	112	32.51±2.17	31.28±2.45	32.61±3.21	-0.10±2.21	0.633	-4.4, 4.2	0.727	2.21
	Normal weight	718	35.97±2.94	36.00±2.94	36.08±3.67	-0.10±2.42	0.259	-4.8, 4.6	0.748	2.42
	Overweight	286	41.02±4.95^#	41.03±4.94	40.85±5.36	0.17±2.81	0.308	-5.3, 5.7	0.731	2.79
	Premenopausal	339	38.30±5.26	38.39±5.25	38.38±5.85	-0.08±2.67	0.559	-5.3,5.2	0.791	2.68
	Postmenopausal	777	36.32±3.78	36.22±3.70	36.33±4.16	-0.01±2.43	0.917	-4.8, 4.7	0.668	2.40

LBM, lean body mass; , equation for all males; , equation for all females; SEE, standard error of estimation; R², coefficient of determination; LBM_PE, lean body mass calculated by prediction equations; LBM_DXA, lean body mass measured by dual energy X-ray absorptiometry.
Bias shows differences between LBM_PE and LBM_DXA and results are expressed as mean ± standard deviation.
Paired sample t-test is performed to evaluate the differences between LBM_PE and LBM_DXA. P < 0.05 indicates that the difference is statistically significant.
95% LoA: 95% limits of agreement for mean difference; limits of agreement = - 1.96 standard deviations – + 1.96 standard deviations.
P < 0.05, compared with LBM by equations for the subgroups; ^#P > 0.05, compared with LBM by equations for the subgroups.