Figure 2

Correlation analysis of Nf-L levels in CSF and serum stored at −20 °C and at −80 °C. Spearman’s rank correlation test showed a positive correlation between Nf-L levels in CSF (A) and serum (B) samples stored in duplicate at −20 °C and −80 °C. The scatter points denote individual data points. CSF denotes cerebrospinal fluid, Nf-L neurofilament light chain.