Statistical analysis
REGRESSION
First, Pearson correlation was used to assess cross-correlations between OTS ROIs. Next, to determine if MK6240 meningeal OTS was related to biological variables we used linear regression for continuous variables (e.g., age) and two-sided t-tests for categorical variables (e.g., sex). Then, OTS ROI SUVRs were used to group participants into tertiles representing low, medium, and high OTS groups (