. Author manuscript; available in PMC: 2016 Jan 11.

Published in final edited form as: J Alzheimers Dis. 2015 Oct 22;49(3):845–851. doi: 10.3233/JAD-150442

Table 1.

Descriptive statistics by group

	MCI	NCI	t or χ²	p-Value
n (%)	144 (20%)	586 (80%)
mean age (SD)	84.255 (6.135)	81.078 (7.838)	t = −5.25	<0.001
mean education (SD)	15.403 (3.009)	15.171 (3.091)	t = −0.81	0.417
gender (% female)	100 (69%)	453 (77%)	X² = 3.89	0.049
race (% White)	134 (93%)	549 (94%)	X² = 0.25	0.616
Episodic memory z-score mean (SD)	−0.424 (0.656)	0.531 (0.518)	t = 16.25	<0.001
Semantic memory z-score mean (SD)	−0.147 (0.625)	0.348 (0.552)	t = 9.31	<0.001
Working memory z-score mean (SD)	−0.240 (0.679)	0.239 (0.689)	t = 7.49	<0.001
Perceptual speed z-score mean (SD)	−0.347 (0.750)	0.256 (0.755)	t = 8.56	<0.001
Visuospatial ability z-score mean (SD)	−0.137 (0.880)	0.314 (0.643)	t = 6.89	<0.001
Global cognitive z-score mean (SD)	−0.306 (0.431)	0.376 (0.440)	t = 16.71	<0.001
Susceptibility to scams mean (SD)	3.021 (0.696)	2.815 (0.696)	t = −3.18	0.002

n, sample size; SD, standard deviation; MCI, mild cognitive impairment; NCI, non-cognitively impaired.