GFAP and Alzheimer disease: The median [Q1, Q3] GFAP values of HC, AD, BT, and CI subjects were 23.1 [19.1, 30.0], 100.5 [65.1, 140.6], 63.4 [45.1, 153.9], and 50.4 [38.6, 109.4], respectively.