| 3 Months | 1 Year | 3 Years | 5 Years | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (Tx 2003 - 2004) | (Tx 2003 - 2004) | (Tx 2001 - 2004) | (Tx 1999 - 2004) | ||||||||||
| N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | ||
| Total | All | 2,151 | 93.2% | 0.5% | 2,151 | 84.9% | 0.8% | 4,161 | 66.4% | 0.9% | 5,925 | 51.6% | 0.9% |
| Yearly Center Volume | 0-3 | 40 | 92.5% | 4.2% | 40 | 77.5% | 6.6% | 103 | 60.3% | 5.2% | 228 | 50.3% | 4.0% |
| 4-6 | 70 | 92.9% | 3.1% | 70 | 81.4% | 4.6% | 188 | 56.8% | 4.5% | 215 | 47.7% | 4.2% | |
| 7-11 | 172 | 89.0% | 2.4% | 172 | 75.6% | 3.3% | 258 | 58.2% | 3.5% | 465 | 44.9% | 3.1% | |
| 12-20 | 334 | 92.5% | 1.4% | 334 | 85.9% | 1.9% | 919 | 61.9% | 1.9% | 1,450 | 45.5% | 1.9% | |
| 21+ | 1,535 | 93.9% | 0.6% | 1,535 | 86.1% | 0.9% | 2,693 | 69.6% | 1.0% | 3,567 | 55.1% | 1.2% | |