. 2020 Sep 11;15(9):e0238690. doi: 10.1371/journal.pone.0238690

Table 2. Alzheimer's Disease neuroimaging initiative baseline characteristics.

Characteristic	Mean (SD) Minimum, Maximum Number of missing values (if applicable) unless otherwise specified
Age (years)	75.17 (6.56)
Age (years)	54.40, 89.60
Education (years)	15.84 (2.94)
Education (years)	6.00, 20.00
Sex
Female n (%)	228 (40%)
Male	345
Alzheimer’s Disease Assessment Scale-Cognitive Subscale	9.51 (4.63)
Alzheimer’s Disease Assessment Scale-Cognitive Subscale	0, 28
Mini-Mental State Examination	27.78 (1.84)
Mini-Mental State Examination	23, 30
Rey Auditory Verbal Learning Test (3 trials)	18.34 (5.64)
Rey Auditory Verbal Learning Test (3 trials)	5, 38
Clinical Dementia Rating Scale-Sum of Boxes	1.02 (1.03)
Clinical Dementia Rating Scale-Sum of Boxes	0.00, 4.50
Trail Making Test A	41.41 (20.08)
	17.00, 188.00
	4
Trail Making Test B	114.8 (65.62)
	34.0, 348.0
	5
Digit Span Forward Test	6.64 (1.05)
Digit Span Forward Test	4, 8
Digit Span Backward Test	4.71 (1.19)
Digit Span Backward Test	0, 7

Number of participants = 573, all from ADNI1. Five ADNI 1 participants were missing at least one covariate value for the fifth ADAS-Cog-Proxy candidate model and were excluded solely from analyses pertaining to that model.