Comment by pks016

Not expert in medical science.

Here's my understanding β is coefficient (slope) for the linear mixed model and 95% CI is the confidence interval for the coefficient. There are no effect sizes given, my guess is it's harder to calculate for linear mixed models when models gets complicated. It's not easy/useful to interpret from coefficient here.

Rather see Table 3 for mean and SD. The mean(SD) change for cognition for Treatment group was 0.40 (0.83) and for placebo was 0.19 (0.70). Linear mixed model showed this was significant when other factors held constant.