Table 1.

Participant characteristics (SDs in parentheses).

	Age	Years of education	Healtha	Semantic fluencyb	Verbal comprehensionc	Speed of processingd
Young	20.37 (2.16)	15.50 (0.82)	4.32 (0.58)	18.18 (2.75)	34.12 (6.50)	86.35 (14.25)
Older	65.13 (4.02)	15.85 (2.98)	4.15 (0.55	14.71 (4.11)	38.85 (7.69)	59.88 (15.61)

^aParticipants rated their state of health on a scale from 1 (very bad) to 5 (very good). ^b1 min of animal names. ^cPMA Verbal factor (Thurstone, 1938/1996).

^dDigit symbol-coding task (Wechsler, 1997/1999).