| 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 | 212 | 86.8% | 2.3% | 212 | 73.4% | 3.1% | 398 | 52.3% | 3.0% | 531 | 43.0% | 3.0% |
| Yearly Center Volume | 0-1 | 13 | 69.2% | 12.8% | 13 | 53.8% | 13.8% | 32 | 38.3% | 11.4% | 45 | 28.7% | 9.2% |
| 2-7 | 6 | 83.3% | 15.2% | 6 | 66.7% | 19.2% | 22 | 66.7% | 10.5% | 31 | 47.0% | 11.5% | |
| 8+ | 193 | 88.1% | 2.3% | 193 | 74.9% | 3.1% | 344 | 53.0% | 3.2% | 455 | 44.2% | 3.2% | |