Accuracy of measurements of small changes in soft-tissue mass by dual-energy x-ray absorptiometry

Table 1: Reproducibility of masses derived by dual-energy x-ray absorptiometry (DXA)

Mean mass (and standard deviation), kg

Type of mass Time 1 Time 2 Coefficient of variation, % Repeatability coefficient, kg

Bone 2.7 (0.29) 2.7 (0.29) 0.4 0.02

Fat 12.4 (5.11) 12.1* (5.08) 2.3 0.58

Lean soft tissue 57.9 (5.34) 58.2* (5.37) 0.5 0.56

Lean 60.6 (5.59) 60.9* (5.62) 0.5 0.56

Total 73.1 (7.04) 73.0 (7.07) 0.1 0.15

*Significantly different from mass at time 1, according to a paired Student's t-test

Table 1: Reproducibility of masses derived by dual-energy x-ray absorptiometry (DXA)
	Mean mass (and standard deviation), kg
Type of mass	Time 1	Time 2	Coefficient of variation, %	Repeatability coefficient, kg
Bone	2.7 (0.29)	2.7 (0.29)	0.4	0.02
Fat	12.4 (5.11)	12.1* (5.08)	2.3	0.58
Lean soft tissue	57.9 (5.34)	58.2* (5.37)	0.5	0.56
Lean	60.6 (5.59)	60.9* (5.62)	0.5	0.56
Total	73.1 (7.04)	73.0 (7.07)	0.1	0.15
*Significantly different from mass at time 1, according to a paired Student's t-test