| 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 | 2,855 | 91.6% | 0.5% | 2,855 | 81.6% | 0.7% | 7,503 | 51.5% | 0.8% | 12,085 | 26.3% | 0.8% |
| Yearly Center Volume | 0-3 | 36 | 91.7% | 4.6% | 36 | 88.5% | 5.4% | 193 | 49.0% | 5.6% | 411 | 23.2% | 2.9% |
| 4-6 | 50 | 84.0% | 5.2% | 50 | 80.0% | 5.7% | 77 | 34.0% | 7.0% | 447 | 26.6% | 3.5% | |
| 7-11 | 165 | 92.7% | 2.0% | 165 | 82.2% | 3.0% | 658 | 48.7% | 2.6% | 1,187 | 20.2% | 2.5% | |
| 12-20 | 433 | 89.8% | 1.5% | 433 | 77.7% | 2.0% | 1,100 | 44.0% | 2.1% | 2,680 | 22.9% | 1.5% | |
| 21+ | 2,171 | 92.0% | 0.6% | 2,171 | 82.3% | 0.8% | 5,475 | 53.7% | 0.9% | 7,360 | 28.4% | 1.0% | |