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Demographic characteristics of the study populations.
| Lakeville, MN | Cedar Rapids, IA | |||||
| Experimental | Control | Total | Experimental | Control | Total | |
| Population | - | - | 23,000 | - | - | 120,000 |
| N | 391 | 385 | 776 | 294 | 289 | 583 |
| %White | 96% | 97% | 96% | 93% | 94% | 93% |
| % with >12 yrs education | 96% | 94% | 95% | 87% | 82% | 85% |
| Income >$36,000 | 96% | 96% | 96% | 73% | 74% | 74% |
| Income >$100,000 | 48% | 43% | 45% | 22% | 14% | 18% |
| % Married | 93% | 93% | 94% | 75% | 74% | 75% |
