Subject characteristics
| Characteristics | Categories | Percentage (N=148 938) |
|---|---|---|
| Age (years) | 49–55 | 17.8 |
| 56–69 | 60.9 | |
| 70–81 | 21.3 | |
| Race | White | 82.7 |
| Marital status | Married | 62.4 |
| Education level | High-school graduate or less | 22.3 |
| Post high school | 38.5 | |
| College graduate or higher | 39.1 | |
| Income | <US$35000 | 42 |
| US$35000 to US$75000 | 37.9 | |
| ≥US$75000 | 17.4 | |
| Health score | <75 | 41 |
| 75–90 | 43 | |
| >90 | 9 |