| 3 Months | 1 Year | 5 Years | 10 Years | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (Tx 2006 - 2007) | (Tx 2006 - 2007) | (Tx 2002 - 2007) | (Tx 1997 - 2007) | ||||||||||
| N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | ||
| Total | All | 2,718 | 92.3% | 0.5% | 2,718 | 83.3% | 0.7% | 7,199 | 54.4% | 0.8% | 11,661 | 28.7% | 0.8% |
| Yearly Center Volume | 0-3 | 36 | 91.7% | 4.6% | 36 | 88.9% | 5.2% | 185 | 50.8% | 5.7% | 403 | 26.5% | 2.8% |
| 4-6 | 47 | 83.0% | 5.5% | 47 | 80.9% | 5.7% | 75 | 36.7% | 7.1% | 421 | 31.1% | 3.5% | |
| 7-11 | 156 | 93.6% | 2.0% | 156 | 84.0% | 2.9% | 629 | 52.0% | 2.6% | 1,138 | 22.8% | 2.6% | |
| 12-20 | 411 | 90.8% | 1.4% | 411 | 78.8% | 2.0% | 1,049 | 45.8% | 2.1% | 2,586 | 24.8% | 1.5% | |
| 21+ | 2,068 | 92.8% | 0.6% | 2,068 | 84.1% | 0.8% | 5,261 | 56.8% | 0.9% | 7,113 | 30.8% | 1.0% | |