| No. at risk for first incident event: | ||||||
| <5 | 289 | 285 | 259 | 226 | 187 | 160 |
| 5 to <30 | 268 | 263 | 241 | 219 | 189 | 153 |
| 30+ | 548 | 529 | 477 | 411 | 343 | 272 |
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