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. Author manuscript; available in PMC: 2010 Jun 1.
Published in final edited form as: Psychol Aging. 2009 Jun;24(2):462–475. doi: 10.1037/a0014417

Table 1.

Means (and standard deviations) of participant characteristics

Measure Yngfeedback Yngno feedback Oldfeedback Oldno feedback
Age (years)1 22.2 (5.4) 21.3 (2.5) 66.7 (3.9) 67.0 (3.8)
Number of Medications1 1.0 (1.3) 1.4 (1.4) 2.4 (1.4) 2.3 (1.8)
Vocabulary1 29.5 (3.7) 29.2 (4.0) 35.2 (4.0) 35.2 (2.7)
Digit Symbol1, 3 65.6 (8.5) 69.1 (11.4) 52.1 (12.0) 46.3 (11.5)
Digit Symbol Memory1 7.0 (2.0) 7.7 (1.5) 5.7 (2.5) 5.7 (2.2)

Note. Number of Medications = self- reported number of daily medications taken. Vocabulary = number correct out of 40 on the Shipley Vocabulary Test (Zachary, 1986). Digit Symbol = WAIS Digit-symbol subtest (Wechsler, 1981). Digit Symbol Memory = symbol recall memory following the WAIS Digit-symbol subtest (Wechsler, 1981).

1

Age main effect: p < .05

2

Feedback main effect: p < .05

3

Age × Feedback interaction: p < .05