highly significantp < 0.0001
Finally, Spearman correlation tests between the 25(OH)D concentration values and the absolute and percentage root mean square precision errors (RMSCV and RMSCV%) were performed, showing the highly significant correlation, with r = 0.44 for the absolute root mean square precision error (RMSCV; p < 0.0001) but not for the root mean square precision error expressed in percentages (RMSCV%; r = −0.14; p = 0.08). 4.