| Region of the country | Phase 1 Population over 18 | Phase 2 Target populationa | ||
| Absolute | % | Absolute | % | |
| Southeast | 1638 | 42 | 285 | 47 |
| Northeast | 1134 | 29 | 126 | 18 |
| North/Midwest | 606 | 15 | 100 | 14 |
| South | 537 | 14 | 111 | 21 |
| Total | 3915 | 100 | 622 | 100 |