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Demographic Characteristics of the Study Population
| N | 441 584 |
| Age, y (mean ± SD) | 7.7 ± 5.2 |
| Gender | |
| Male | 50.1% |
| Female | 49.9% |
| Race/ethnicity | |
| Hispanic or nonwhite | 52.4% |
| Non-Hispanic white | 46.6% |
| Missing | 1.0% |
| Urban/rural status | |
| Urban | 84.2% |
| Rural | 15.8% |
| Medicaid type | |
| Mostly managed care | 12.6% |
| Mixed fee-for-service/managed care | 76.8% |
| Mostly fee-for-service | 10.7% |
| Eye care supply in county of residence | |
| Low (<25th percentile) | 5.7% |
| Medium (25th-75th percentile) | 71.3% |
| High (>75th percentile) | 23.0% |
