| 3 Months | 1 Year | 3 Years | 5 Years | ||||||||||
| N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | ||
| Total | All | 887 | 92.8% | 0.9% | 887 | 86.9% | 1.1% | 313 | 76.7% | 2.4% | 139 | 84.2% | 3.1% |
| Yearly Center Volume | 0-9 | 31 | 90.3% | 5.3% | 31 | 80.6% | 7.1% | 12 | 100.0% | 0.0% | 10 | 80.0% | 12.6% |
| 10-19 | 26 | 96.2% | 3.8% | 26 | 84.6% | 7.1% | 38 | 78.9% | 6.6% | 22 | 81.8% | 8.2% | |
| 20-34 | 83 | 85.5% | 3.9% | 83 | 83.1% | 4.1% | 60 | 78.3% | 5.3% | 9 | 88.9% | 10.5% | |
| 35-56 | 184 | 92.4% | 2.0% | 184 | 85.9% | 2.6% | 58 | 72.4% | 5.9% | 21 | 81.0% | 8.6% | |
| 57+ | 563 | 94.0% | 1.0% | 563 | 88.3% | 1.4% | 145 | 75.2% | 3.6% | 77 | 85.7% | 4.0% | |