TABLE 6.

Test-retest precision of body composition predictions from 3DO scans and DXA scans¹

	3DO PCA						DXA
	Male			Female			Male			Female
	n	%CV	RMSE	n	%CV	RMSE	n	%CV	RMSE	n	%CV	RMSE
FMI, kg/m2	119	4.37	0.266	162	2.68	0.250	119	1.37	0.082	162	0.91	0.085
FFMI, kg/m2	119	1.26	0.266	162	1.45	0.250	119	0.50	0.105	162	0.58	0.099
Fat mass, kg	119	4.30	0.809	162	2.67	0.655	119	1.36	0.251	162	0.91	0.223
FFM, kg	119	1.24	0.809	162	1.45	0.655	119	0.51	0.332	162	0.57	0.259
Percentage fat, %	119	4.69	1.010	162	2.92	0.987	119	—	0.277	162	—	0.308
Visceral fat mass, kg	119	7.40	0.033	162	6.78	0.028	119	6.80	0.030	162	7.40	0.031
Trunk fat mass, kg	119	5.14	0.466	165	2.88	0.321	119	2.66	0.239	165	2.00	0.222
Trunk FFM, kg	119	1.37	0.426	165	1.61	0.361	119	0.97	0.302	165	1.10	0.245
Arms fat mass, kg	119	4.76	0.054	161	3.45	0.055	119	3.02	0.034	161	2.73	0.043
Arms FFM, kg	119	3.11	0.135	162	2.45	0.059	119	1.64	0.072	162	1.82	0.043
Legs fat mass, kg	121	6.41	0.207	161	6.53	0.299	121	2.36	0.074	161	1.38	0.064
Legs FFM, kg	119	2.43	0.260	162	2.10	0.155	119	1.15	0.124	162	1.12	0.082

¹Repeat 3DO and DXA scans were each performed with repositioning. FFM, fat-free mass; FFMI, fat-free mass index; FMI, fat mass index; PCA, principal component analysis; RMSE, root mean squared error; 3DO, 3-dimensional optical.