| 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 | 404 | 98.8% | 0.6% | 404 | 97.0% | 0.8% | 1,578 | 84.5% | 1.2% | 2,356 | 67.5% | 2.0% |
| Yearly Center Volume | 0-4 | 57 | 100.0% | 0.0% | 57 | 98.2% | 1.7% | 223 | 81.3% | 3.4% | 410 | 65.5% | 6.6% |
| 5-7 | 53 | 96.2% | 2.6% | 53 | 96.2% | 2.6% | 224 | 86.1% | 3.1% | 223 | 75.3% | 4.4% | |
| 8-11 | 88 | 97.7% | 1.6% | 88 | 94.3% | 2.5% | 211 | 86.1% | 3.1% | 395 | 63.1% | 5.6% | |
| 12-19 | 52 | 98.1% | 1.9% | 52 | 96.2% | 2.7% | 275 | 81.7% | 2.8% | 471 | 69.6% | 5.3% | |
| 20+ | 154 | 100.0% | 0.0% | 154 | 98.7% | 0.9% | 645 | 85.7% | 1.8% | 857 | 67.0% | 2.8% | |