Table 1

Characteristics of the National Institute on Aging Cohort

VariableAll participants (N=6 9 6)
Age (years), mean (SD)63.2 (5.4)
Female, %68.5
Race, %
 African-American37.9
 White54.4
 Other7.7
Education, %
 High school or less24.3
 Some college20.4
 College graduate21.6
 Graduate degree33.7
Income, %
 <US$10 00010.4
 US$10 000–US$24 99917.9
 US$25 000–US$49 99914.2
 >US$50 00057.5
Chronic conditions, mean (SD)1.8 (1.4)