| 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 | 62 | 85.5% | 4.5% | 62 | 80.6% | 5.0% | 192 | 44.9% | 5.0% | 419 | 29.0% | 3.2% |
| Yearly Center Volume | 0-4 | 1 | 100.0% | 0.0% | 1 | 100.0% | 0.0% | 24 | 27.0% | 13.1% | 50 | 24.8% | 6.7% |
| 5-7 | 7 | 71.4% | 17.1% | 7 | 57.1% | 18.7% | 4 | + | + | 47 | 36.8% | 8.5% | |
| 8-13 | 6 | 83.3% | 15.2% | 6 | 83.3% | 15.2% | 22 | 18.1% | 11.0% | 22 | 40.9% | 10.5% | |
| 14-22 | 2 | 100.0% | 0.0% | 2 | 100.0% | 0.0% | 27 | 50.5% | 12.3% | 79 | 0.0% | 0.0% | |
| 23+ | 46 | 87.0% | 5.0% | 46 | 82.6% | 5.6% | 115 | 55.2% | 6.1% | 221 | 30.3% | 4.4% | |