| 3 Months | 1 Year | 3 Years | 5 Years | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (Tx 2002 - 2003) | (Tx 2002 - 2003) | (Tx 2000 - 2003) | (Tx 1998 - 2003) | ||||||||||
| N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | ||
| Total | All | 28 | 78.6% | 7.8% | 28 | 78.6% | 7.8% | 71 | 60.5% | 6.3% | 129 | 41.2% | 5.5% |
| Yearly Center Volume | 0-3 | 8 | 87.5% | 11.7% | 8 | 87.5% | 11.7% | 21 | 60.7% | 12.3% | 33 | 48.6% | 10.3% |
| 4-6 | 0 | - | - | 0 | - | - | 1 | 0.0% | 0.0% | 2 | + | + | |
| 7-11 | 4 | 100.0% | 0.0% | 4 | 100.0% | 0.0% | 5 | 100.0% | 0.0% | 10 | 77.1% | 14.4% | |
| 12-20 | 5 | 80.0% | 17.9% | 5 | 80.0% | 17.9% | 13 | 46.2% | 13.8% | 68 | 33.0% | 6.9% | |
| 21+ | 11 | 63.6% | 14.5% | 11 | 63.6% | 14.5% | 31 | 63.1% | 9.0% | 16 | + | + | |