| 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 | 57 | 70.2% | 6.1% | 57 | 57.9% | 6.5% | 130 | 52.1% | 4.6% | 222 | 40.2% | 3.8% |
| Yearly Center Volume | 0-4 | 8 | 87.5% | 11.7% | 8 | 50.0% | 17.7% | 20 | 30.0% | 10.2% | 30 | 30.0% | 9.1% |
| 5-7 | 2 | 50.0% | 35.4% | 2 | 0.0% | 0.0% | 9 | 63.5% | 16.9% | 39 | 47.4% | 8.2% | |
| 8-13 | 9 | 66.7% | 15.7% | 9 | 55.6% | 16.6% | 23 | 69.6% | 9.6% | 17 | 46.7% | 20.5% | |
| 14-22 | 16 | 81.3% | 9.8% | 16 | 75.0% | 10.8% | 16 | 62.5% | 12.1% | 37 | 31.9% | 9.1% | |
| 23+ | 22 | 59.1% | 10.5% | 22 | 54.5% | 10.6% | 62 | 48.8% | 7.0% | 99 | 41.7% | 5.7% | |