Characteristics of study respondents and sites
| Characteristics | N (%) |
| Age | n=3998 |
| 18–25 | 151 (4) |
| 26–34 | 340 (9) |
| 35–54 | 952 (24) |
| 55–64 | 1103 (28) |
| 65+ | 1452 (36) |
| Gender | n=3946 |
| Female | 1374 (35) |
| Male | 2572 (65) |
| Education | n=3970 |
| Less than high school | 110 (3) |
| High school | 1080 (27) |
| Some college | 1101 (28) |
| College | 1052 (27) |
| Graduate degree or above | 627 (16) |
| Race | n=3974 |
| White | 2802 (71) |
| African American | 731 (18) |
| Asian | 79 (2) |
| Hispanic | 181 (5) |
| Other/mixed race | 181 (5) |
| No of different doctors seen in the past year | n=3987 |
| 0 | 29 (1) |
| 1 | 250 (6) |
| 2 | 496 (12) |
| 3 | 637 (16) |
| 4 | 606 (15) |
| 5 | 440 (11) |
| 6 or more | 1529 (38) |
| Geographical region | n=4062 |
| Midwest | 2225 (55) |
| Northeast | 449 (11) |
| West | 257 (6) |
| South | 1131 (28) |