| 3 Months | 1 Year | 5 Years | 10 Years | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (Tx 2006 - 2007) | (Tx 2006 - 2007) | (Tx 2002 - 2007) | (Tx 1997 - 2007) | ||||||||||
| N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | ||
| Total | All | 198 | 85.3% | 2.5% | 198 | 75.5% | 3.1% | 677 | 51.5% | 2.4% | 1,110 | 34.7% | 2.7% |
| Yearly Center Volume | 0-4 | 8 | 87.5% | 11.7% | 8 | 75.0% | 15.3% | 22 | 53.2% | 13.6% | 67 | + | + |
| 5-7 | 11 | 81.8% | 11.6% | 11 | 70.1% | 14.7% | 40 | 62.2% | 10.4% | 72 | 29.9% | 9.6% | |
| 8-11 | 22 | 72.7% | 9.5% | 22 | 72.7% | 9.5% | 48 | 50.6% | 9.0% | 83 | + | + | |
| 12-19 | 27 | 92.6% | 5.0% | 27 | 85.2% | 6.8% | 91 | 50.9% | 7.2% | 158 | 24.1% | 8.1% | |
| 20+ | 130 | 86.2% | 3.0% | 130 | 74.5% | 3.8% | 476 | 50.7% | 2.7% | 730 | 37.5% | 3.0% | |