Sample characteristics by PIB and WMH pathology^a status.

aDefined as WMH volume ≥0.5% of total intracranial volume (ICV). bunavailable for 9 participants. cderived from FLAIR segmentation, available for 24 PiB−, 26 PiB+, 28 WMH−, 22 WMH+. dp-value from MANOVA, df = 1,55. ep-value from Pearson Chi-Square test.a. 定义为脑白质高信号（White Matter Hyperintensities, WMH）体积≥颅内总容积（Intracranial Volume, ICV）的0.5%。 b. 9名受试者的相关数据未获取。 c. 该指标源自液体衰减反转恢复（Fluid-Attenuated Inversion Recovery, FLAIR）序列的分割结果，有效数据涵盖24名PiB⁻受试者、26名PiB⁺受试者、28名WMH⁻受试者及22名WMH⁺受试者。 d. 多变量方差分析（Multivariate Analysis of Variance, MANOVA）所得p值，自由度df=1,55。 e. 皮尔逊卡方检验所得p值。