I agree the slides in San Diego must have included some measure of variability and/or a scatter diagram of individual values. So why did DM remove them for the webcast? I also noted that one of the slides said they used a t-test for the stats comparisons, which I would not have thought appropriate for MoCA data. A non-parametric test like the Mann-Whitney U-test would have been more appropriate, as used in the study below to compare scores in men and women. Confusing!

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6027948/