Demographics of Fire Department of the City of New York cohort by exposure group
| Exposure group | High | Moderate | Low | Total |
|---|---|---|---|---|
| Arrival time | 9 September am | 9 September pm to 12 September | 9 September to 24 September | |
| N | 1623 (16.5%) | 7025 (71.3%) | 1200 (12.2%) | 9848 |
| Mean age as of 11 September 2001 (SD) | 40.2 (7.3) | 39.9 (7.4) | 41.2 (7.9) | 40.1 (7.4) |
| (Range) | (21.3, 62.1) | (21.4, 64.3) | (22.5, 63.8) | (21.3, 64.3) |
| # Caucasian (% of non-missing) | 1487 (91.7%) | 6643 (94.6) | 1113 (92.8%) | 9243 (93.9%) |
| # Current smokers as of 11 September 2014 (% of non-missing) | 93 (5.7%) | 372 (5.3%) | 82 (6.8%) | 547 (5.6%) |
| # Former smokers as of 11 September 2014 (% of non-missing) | 505 (31.1%) | 2229 (31.7%) | 397 (33.1%) | 3131 (31.8%) |
| # Retired after 11 September 2001 (%) | 873 (53.8%) | 3344 (47.6%) | 635 (52.9%) | 4852 (49.3%) |
| Mean follow-up (years) (SD) | 8.2 (2.6) | 8.5 (2.4) | 8.5 (2.4) | 8.4 (2.4) |
| Mean # of physical examinations per firefighter (SD) | 32.5 (22.3) | 32.5 (22.5) | 30.7 (23.4) | 32.3 (22.6) |
| (Range) | (1, 138) | (0, 154) | (1, 148) | (0, 154) |
| Total diagnosed rhinosinusitis | 382 (23.5%) | 1336 (19%) | 149 (12.4%) | 1867 (19%) |