Characteristics Participant Non-participant P-value Age, years 65.43±14.41 66.72±12.36 0.39 Male 65.29 66.67 0.78 African-American 32.2 32.3 0.99 Income, thousands of dollars 51.95±19.90 50.88±17.83 0.61

Table 1: Characteristics* according to participation status among 974 eligible individuals.* Mean ± SD for continuous values or % for categorical values.