Additionally, an estimation of the repeatability
coefficient (RC) (Bland & Altman 1986) in a
previous study by one of the authors (Philippou, 2008;
Philippou et al. 2009) calculated the mean (SD) of the
differences between the two repeated measurements as
0.12% (0.28%) and the RC of measurements as 0.58, with
no significant differences between the first and the second
measurement (P = 0.2).