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. Author manuscript; available in PMC: 2010 Apr 1.
Published in final edited form as: Neurobiol Aging. 2009 Feb 20;30(4):507–514. doi: 10.1016/j.neurobiolaging.2008.09.023

Table 1.

Characteristics of samples

All Longitudinal Short-term Retest
N 2350 729 139
Age 40.7 (13.3) 42.1 (12.0) 43.3 (13.2)
% Females 68.0 69.0 70.0
Education 15.5 (2.5) 15.4 (2.5) 15.5 (2.3)
Health 2.1 (0.9) 2.1 (0.9) 2.0 (0.9)
Scaled Scores
 Vocabulary 12.5 (3.0) 12.6 (3.0) 11.8 (2.7)
 Digit Symbol 11.3 (2.9) 11.4 (2.9) 11.1 (2.9)
 Logical Memory 11.7 (2.7) 11.7 (2.7) 11.9 (2.6)
 Word Recall 12.3 (3.2) 12.5 (3.2) 11.7 (3.0)
Retest Interval N.A. 2.5 (1.1) 7.1 (8.5)

Note: Education is in years of formal education completed, and health is a self-rating of health on a scale ranging from 1 for excellent to 5 for poor. Vocabulary is the raw score on the Wechsler Adult Intelligence Scale III (Wechsler, 1997) Vocabulary test. Retest interval is in years for the longitudinal sample and in days for the short-term retest sample. N.A. means that the variable is not available in that sample.