Fig. 5.

Variability in relation to initial levels. Plots of sample 1 levels versus the pair-wise $\mathrm{\Delta }$ for each CSF parameter. Albumin, granulocytes, erythrocytes, and the LE ratio have been log-transformed in order to improve visualization. Cells show a clear heteroscedasticity potentially impacting diagnostics that is not seen for glucose and lactate, but to some extent for albumin. This suggests a heterogeneity of larger molecules in the sampled volumes. $\mathrm{\Delta }$: pair-wise difference