Table 1.

Participant Demographics for (A) Training Data and (B) Testing Data

		$CA$ (y)				Sex Ratio	FreeSurfer Version
Data Source	$n$ *	min	max	$\mu$ †	$\sigma$ ‡	M:F	5.3.0	6.0.0	7.1.1
(A) Training data
ADNI	513	56	95	75.1	7.2	0.46	0	260	253
HCP-A	508	36	80	55.8	12.0	0.42	0	309	199
HCP-YA	1 112	22	37	28.8	3.7	0.46	1 112	0	0
UKBB	1 285	45	83	62.7	10.1	0.47	0	1 285	0
all	3 418	22	95	52.6	19.3	0.46	1 112	1 854	452
(B) Testing data
Cam-CAN	651	18	88	54.2	18.6	0.496	0	0	651

Notes: $CA$ = chronological age; Cam-CAN = Cambridge Centre for Ageing and Neuroscience; F = female; HCP-A = Human Connectome Project Aging; HCP-YA = Human Connectome Project Young Adult; M = male; max = maximum; min = minimum; UKBB = UK Biobank. Listed are the sample size $n$, the min, max, mean $\mu$, and standard deviation $\sigma$ of the sample $CA$, the M:F ratio, and FreeSurfer version used for preprocessing.

*$n$ = sample size

^† $\mu$ = mean $CA$ of sample

^‡ $\sigma$ = standard deviation of $CA$ of sample