Table 1.

Sample Demographics

	Descriptive Statistics		Inferential Statistics
	Younger Adults	Older Adults	T	dof	p	95% CI	Cohen’s d
N
Ithaca	131 (74 female)	83 (47 female)
Toronto	27 (17 female)	22 (11 female)
Race	60.39% white, 20.13% asian, 8.44% black or african american, 3.90% mixed race, .54% other, 2.60% not provided	94.23% white, .96% asian, 1.93% black or african american, 2.88% other
Ethnicity	81.17% non-hispanic or latino, 11.04% hispanic or latino, 7.79% not provided	92.31% non-hispanic or latino, 1.92% hispanic or latino, 5.77% not provided
Age (years)
Range	18 – 34	60 – 89
M	22.59	68.19
SD	3.33	6.29
Education (years)*
Range	12.00 – 24.00	12.00 – 24.00	−7.32	261	< .001	[−2.78, −1.60]	0.92
M	15.18	17.37
SD	1.94	2.90
Episodic Memory*			15.98	255	< .001	[1.08, 1.36]	2.22
Range	−1.71 – 1.41	−2.11 – 0.65
M	0.48	−0.72
SD	0.47	0.69
Semantic Memory*
Range	−2.78 – 1.42	−1.21 – 1.94	−8.9	255	< .001	[−1.02, −.65]	1.13
M	−0.34	0.51
SD	0.77	0.69

Note. Episodic Memory and Semantic Memory reflect composite scores. Age group differences in NIH fluid cognition, episodic memory, and semantic memory were tested in 257 participants. Positive T values reflect higher scores in younger adults, negative values reflect higher scores in older adults. Statistical tests are nearly identical when including sex, education, site, and eWBV as covariates in an ANCOVA.