| 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 | 309 | 89.3% | 1.8% | 309 | 78.3% | 2.3% | 789 | 57.1% | 2.4% | 1,135 | 43.5% | 2.5% |
| Yearly Center Volume | 0-1 | 16 | 62.5% | 12.1% | 16 | 50.0% | 12.5% | 63 | 59.4% | 6.6% | 89 | 13.1% | 10.1% |
| 2-7 | 45 | 82.2% | 5.7% | 45 | 71.1% | 6.8% | 94 | 38.8% | 6.1% | 226 | 49.7% | 11.5% | |
| 8+ | 248 | 92.3% | 1.7% | 248 | 81.5% | 2.5% | 632 | 60.7% | 2.7% | 820 | 45.1% | 2.6% | |