Table 3.

Agreement of 2D:4D measurements

Observer	RX mean (SD)	DXA mean (SD)	∆	TEM (%)	SEE	ICC (95% CI)	Classification
Observer 1	0.905 (0.020)	0.908 (0.019)	0.003	0.009 (1.2%)	0.010	0.89 (0.83-0.93)	very good
Observer 2	0.904 (0.020)	0.907 (0.020)	0.003	0.011 (1.4%)	0.010	0.81 (0.74-0.87)	very good

Note: Intrarater reliability (repeatability) for both raters. = difference; TEM = technical error of measurement, absolut and in % of the mean . SEE = standard error of estimate; ICC = intraclass correlation coefficients; CI = confidence intervall; classification according to Rosner (2011). ICCs < 0.7 were considered non-acceptable, 0.71 < ICCs < 0.79 were acceptable, 0.80 < ICCs < 0.89 were very good and ICCs >0.90 were excellent.