State and total response rates plus population estimates based on 2000 Census data.
| State | Number of responses | Response rate (%) | Proportion of population (%) | Population (2000 Census) |
|---|---|---|---|---|
| IL | 40 | 20.9 | 9.4 | 12,419,660 |
| IN | 6 | 22.2 | 6.9 | 6,080,485 |
| MI | 25 | 21.2 | 6.3 | 9,938,492 |
| WI | 50 | 20.0 | 23.4 | 5,363,708 |
| Overall | 123z | 21.0 | 10.5 | 33,802,345 |
↵zState was unknown for two responses.