Table 1.

Demographic variables by age decade

	20s	30s	40s	50s	60s	70s
N	84	36	23	37	77	40
Age	25.3 (2.6)	33.5 (2.9)	44.9 (2.7)	53.9 (3.1)	64.7 (2.6)	73.4 (2.6)
Prop. Female	.58	.61	.43	.54	.53	.55
Yrs. Educ.	15.7 (2.1)	16.5 (2.5)	16.0 (2.6)	16.2 (2.0)	15.9 (2.6)	17.5 (2.5)
Cognition	.56 (0.9)	.29 (0.9)	.27 (0.7)	−.22 (1.1)	−.36 (0.9)	−.69 (0.7)
Thickness	.75 (0.8)	.44 (0.6)	.52 (0.7)	−.13 (0.7)	−.68 (0.8)	−.79 (0.7)

Note: Values in parentheses are standard deviations. The cognition and thickness values correspond to the first principal factors across the 12 cognitive measures and the 33 cortical thickness measures.