Comparison of level of annual salary (U.S. dollars) of participants versus nonparticipants.
| Annual salary* | % of participants | % of nonparticipants |
|---|---|---|
| $0–$30,000 | 9 | 7 |
| $30,00–$85,000 | 59 | 56 |
| >$85,000 | 32 | 37 |
1 Sample size = 181, chi-square = 0.5608 (P = 0.76, DF = 2).