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Correlation of CSF YKL-40 levels with CSF tau levels, disease duration and age at onset. Correlation analysis between CSF YKL-40 and (a) CSF tau levels, (b) disease duration (as time in months from disease onset to death) and (c) age at onset. The association between CSF YKL-40 and either biomarkers or demographics parameters was investigated with the Spearman correlation. Positive correlation was detected only for CSF YKL-40 versus CSF tau comparison
