| 3 Months | 1 Year | 3 Years | 5 Years | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (Tx 2002 - 2003) | (Tx 2002 - 2003) | (Tx 2000 - 2003) | (Tx 1998 - 2003) | ||||||||||
| N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | ||
| Total | All | 2,093 | 90.6% | 0.6% | 2,093 | 81.4% | 0.9% | 4,067 | 62.9% | 0.9% | 5,767 | 47.5% | 0.9% |
| Yearly Center Volume | 0-3 | 67 | 92.5% | 3.2% | 67 | 71.0% | 5.6% | 133 | 61.7% | 4.7% | 248 | 45.7% | 3.9% |
| 4-6 | 54 | 90.6% | 4.0% | 54 | 82.7% | 5.3% | 160 | 48.8% | 4.9% | 271 | 43.8% | 3.7% | |
| 7-11 | 127 | 85.8% | 3.1% | 127 | 76.9% | 3.8% | 360 | 54.6% | 3.1% | 466 | 34.2% | 3.5% | |
| 12-20 | 577 | 88.9% | 1.3% | 577 | 77.0% | 1.8% | 1,023 | 58.2% | 1.9% | 1,572 | 42.4% | 1.8% | |
| 21+ | 1,268 | 91.8% | 0.8% | 1,268 | 84.4% | 1.0% | 2,391 | 67.1% | 1.2% | 3,210 | 52.1% | 1.3% | |