| 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 | 178 | 98.9% | 0.8% | 178 | 97.8% | 1.1% | 598 | 88.7% | 1.6% | 990 | 76.1% | 2.4% |
| Yearly Center Volume | 0-4 | 8 | 100.0% | 0.0% | 8 | 100.0% | 0.0% | 22 | 95.5% | 4.4% | 65 | 85.8% | 6.2% |
| 5-7 | 11 | 100.0% | 0.0% | 11 | 100.0% | 0.0% | 39 | 91.1% | 6.3% | 69 | 87.0% | 5.9% | |
| 8-11 | 20 | 100.0% | 0.0% | 20 | 100.0% | 0.0% | 44 | 92.8% | 4.0% | 78 | 74.8% | 10.5% | |
| 12-19 | 26 | 100.0% | 0.0% | 26 | 96.2% | 3.8% | 86 | 85.6% | 5.5% | 143 | 66.8% | 6.2% | |
| 20+ | 113 | 98.2% | 1.2% | 113 | 97.3% | 1.5% | 407 | 88.2% | 1.9% | 635 | 76.3% | 3.0% | |