highly significantP < 0.0001
The Spearman’s rho test showed a highly significant correlation ( r = 0.61; 95% confidence interval [CI] 0.47–0.72, P < 0.0001); the bias between the two determinations (Bland–Altman test) was −0.33 (95% CI, −12.8–12.1; Supplemental Fig. 1 ).