a decreasing trendp < 0.0001
Median CSF total Tau levels differed across the age groups ( p < 0.0001, Kruskal–Wallis test), with a decreasing trend over the age groups < 6 years old, 6 to < 15 years old, and > 15 years old ( p < 0.0001, Kruskal–Wallis test). 2.3.