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Smoking and nonsmoking events of cases.
| Quartile | Smoking events, n (%) | Nonsmoking events, n (%) | Total reports, n (%) |
| 25th | 16 (66. 7) | 8 (33.3) | 24 (5.7) |
| 50th | 12 (20.3) | 47 (79.7) | 59 (14.1) |
| 75th | 31 (31.6) | 67 (31.6) | 98 (23.4) |
| 100th | 177 (74.7) | 61 (74.4) | 238 (56.8) |
