| 3 Months | 1 Year | 3 Years | 5 Years | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (Tx 2003 - 2004) | (Tx 2003 - 2004) | (Tx 2001 - 2004) | (Tx 1999 - 2004) | ||||||||||
| N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | ||
| Total | All | 2,218 | 92.5% | 0.6% | 2,218 | 83.3% | 0.8% | 4,280 | 64.4% | 0.9% | 6,083 | 48.9% | 0.9% |
| Yearly Center Volume | 0-3 | 40 | 92.4% | 4.2% | 40 | 76.6% | 6.8% | 105 | 57.8% | 5.3% | 231 | 45.7% | 4.3% |
| 4-6 | 73 | 93.2% | 3.0% | 73 | 82.1% | 4.5% | 191 | 55.3% | 4.7% | 223 | 44.0% | 4.3% | |
| 7-11 | 176 | 88.6% | 2.4% | 176 | 74.7% | 3.3% | 263 | 56.8% | 3.5% | 478 | 42.1% | 3.1% | |
| 12-20 | 348 | 91.3% | 1.5% | 348 | 82.5% | 2.1% | 953 | 59.6% | 1.9% | 1,490 | 42.9% | 1.9% | |
| 21+ | 1,581 | 93.1% | 0.6% | 1,581 | 84.7% | 0.9% | 2,768 | 67.6% | 1.1% | 3,661 | 52.7% | 1.2% | |