| 3 Months | 1 Year | 3 Years | 5 Years | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (Tx 2002 - 2003) | (Tx 2002 - 2003) | (Tx 2000 - 2003) | (Tx 1998 - 2003) | ||||||||||
| N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | N | % | Std. Err. | ||
| Total | All | 581 | 98.1% | 0.6% | 581 | 95.5% | 0.9% | 1,031 | 90.1% | 1.1% | 1,279 | 84.4% | 1.5% |
| Yearly Center Volume | 0-4 | 45 | 93.3% | 3.7% | 45 | 91.1% | 4.2% | 105 | 85.1% | 4.8% | 154 | 73.6% | 8.3% |
| 5-7 | 94 | 97.9% | 1.5% | 94 | 94.7% | 2.3% | 136 | 94.1% | 2.6% | 119 | 92.4% | 3.0% | |
| 8-11 | 88 | 100.0% | 0.0% | 88 | 96.6% | 1.9% | 147 | 92.4% | 2.6% | 228 | 83.9% | 4.1% | |
| 12-19 | 134 | 97.8% | 1.3% | 134 | 96.3% | 1.6% | 199 | 89.9% | 2.6% | 217 | 86.9% | 2.8% | |
| 20+ | 220 | 98.6% | 0.8% | 220 | 95.9% | 1.3% | 444 | 89.3% | 1.7% | 561 | 84.5% | 2.1% | |