| 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 | 342 | 86.5% | 1.9% | 342 | 72.6% | 2.4% | 860 | 47.3% | 2.4% | 1,242 | 34.1% | 2.4% |
| Yearly Center Volume | 0-1 | 17 | 58.8% | 11.9% | 17 | 47.1% | 12.1% | 66 | 50.5% | 6.6% | 95 | 11.3% | 8.7% |
| 2-7 | 48 | 79.2% | 5.9% | 48 | 64.6% | 6.9% | 97 | 36.9% | 5.7% | 240 | 45.0% | 7.8% | |
| 8+ | 277 | 89.5% | 1.8% | 277 | 75.6% | 2.6% | 697 | 49.3% | 2.7% | 907 | 35.3% | 2.4% | |