| 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 | 550 | 87.1% | 1.4% | 550 | 80.0% | 1.7% | 2,029 | 53.4% | 1.5% | 3,136 | 36.9% | 1.7% |
| Yearly Center Volume | 0-4 | 67 | 79.1% | 5.0% | 67 | 74.2% | 5.4% | 261 | 50.7% | 4.2% | 485 | + | + |
| 5-7 | 71 | 84.5% | 4.3% | 71 | 79.8% | 4.8% | 279 | 54.0% | 3.8% | 282 | 28.1% | 5.9% | |
| 8-11 | 98 | 83.7% | 3.7% | 98 | 74.5% | 4.4% | 243 | 54.1% | 4.5% | 486 | 31.6% | 5.9% | |
| 12-19 | 74 | 87.8% | 3.8% | 74 | 80.9% | 4.6% | 351 | 46.6% | 3.7% | 641 | 37.5% | 4.9% | |
| 20+ | 240 | 91.3% | 1.8% | 240 | 83.5% | 2.4% | 895 | 56.4% | 2.2% | 1,242 | 39.6% | 2.2% | |