Table 2.

Demographics and MRI scans for control groups

	T 1 control group (n = 20)	dMRI control group (n = 14)
Sex	10 males; 10 females	4 males; 10 females
Years of education, mean (SD), years	16.5 (2.1)	Unknown
Mini-Mental State Exam Score at Baseline, mean (SD), score out of 30	29.5 (1.0)	Unknown
Age at first scan, mean (SD), years	59 (6.7)	67 (2.8)
Number of scans, mean (SD), numbera	4.7 (1.1)	2
Length of follow-up period, mean (SD), yearsb	7.2 (1.5)	1.4 (0.6)

^aNumber of scans indicates total number of T₁ or dMRI scans completed. Members of the T₁ control group completed a variable number of scans (between 3 and 7 scans). All members of the dMRI control group completed 2 scans.

^bLength of follow-up period indicates the average time between each person’s first and last scan.