Figure 4
From: Low plasma serotonin linked to higher nigral iron in Parkinson’s disease
Within PD patients, plasma serotonin and nigral iron (as reflected by QSM values) by SSRI/SNRI use and their association with each other within SSRI/SNRI subgroups (a), (b). P-values indicate results of ANCOVA with age and sex as covariates (p-values > 0.05 not shown). Box and error bars indicate age and sex-adjusted mean and 95% CI. (c) Unadjusted Pearson’s correlations. Dashed line marks lowest tertile of serotonin concentrations in PD group. Figure was produced using the ggplot2 package80 in R (version 3.5.3)81.
