| 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 | 191 | 90.1% | 2.2% | 191 | 79.1% | 2.9% | 363 | 60.9% | 3.0% | 480 | 51.7% | 3.0% |
| Yearly Center Volume | 0-1 | 12 | 66.7% | 13.6% | 12 | 58.3% | 14.2% | 30 | 40.8% | 12.0% | 41 | 29.6% | 9.8% |
| 2-7 | 6 | 83.3% | 15.2% | 6 | 66.7% | 19.2% | 21 | 72.4% | 10.7% | 28 | 54.0% | 12.7% | |
| 8+ | 173 | 91.9% | 2.1% | 173 | 80.9% | 3.0% | 312 | 62.2% | 3.2% | 411 | 53.6% | 3.2% | |