| 3 Months | 1 Year | 3 Years | 5 Years | ||||||||||
| N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | ||
| Total | All | 904 | 85.5% | 1.2% | 904 | 79.3% | 1.4% | 336 | 68.7% | 2.6% | 147 | 78.1% | 3.5% |
| Yearly Center Volume | 0-9 | 33 | 84.8% | 6.2% | 33 | 75.8% | 7.5% | 13 | 68.4% | 13.1% | 11 | 81.8% | 11.6% |
| 10-19 | 28 | 92.7% | 5.0% | 28 | 81.6% | 7.4% | 40 | 71.8% | 7.2% | 22 | 76.2% | 9.3% | |
| 20-34 | 85 | 75.9% | 4.7% | 85 | 72.3% | 4.9% | 65 | 71.4% | 5.7% | 10 | 80.0% | 12.6% | |
| 35-56 | 187 | 85.9% | 2.6% | 187 | 78.5% | 3.1% | 67 | 67.1% | 6.0% | 21 | 74.8% | 9.8% | |
| 57+ | 571 | 86.4% | 1.4% | 571 | 80.7% | 1.7% | 151 | 67.2% | 3.9% | 83 | 78.7% | 4.6% | |