Table 1.
Selected characteristics of the World Trade Center Health Program General Responder study sample (N = 28 729)*
| Characteristic | No. (%) |
|---|---|
| Sex | |
| Male | 24 568 (85.52) |
| Female | 4161 (14.48) |
| Median age on 9/11/2001, y | 38 |
| Race/ethnicity | |
| Black | 3068 (10.68) |
| White non-Hispanic | 13 620 (47.41) |
| White Hispanic | 534 (1.86) |
| Hispanic (missing race) | 4622 (16.09) |
| Other race | 1938 (6.75) |
| Unknown/missing | 4947 (17.22) |
| Occupation | |
| Protective services | 14 087 (49.03) |
| Construction | 5975 (20.80) |
| CM&IRG | 2636 (9.18) |
| Other | 6031 (20.99) |
| Smoking history | |
| Current | 4290 (14.93) |
| Former | 7069 (24.61) |
| Never | 17 125 (59.61) |
| Missing | 245 (0.85) |
| Clinical center at time of first visit | |
| Bellevue | 1313 (4.57) |
| Mount Sinai Hospital | 19 503 (67.89) |
| Queens | 2149 (7.48) |
| Stony Brook | 4561 (15.88) |
| Rutgers | 1203 (4.19) |
| Derived exposure level | |
| Very high | 920 (3.20) |
| High | 4896 (17.04) |
| Intermediate | 17 479 (60.84) |
| Low | 4120 (14.34) |
| Missing | 1314 (4.57) |
| Dust exposure/arrival time | |
| Direct dust exposure | 5876 (20.45) |
| Significant dust exposure | 4822 (16.78) |
| Some dust exposure | 2046 (7.12) |
| No exposure/arrival 9/11–9/14 | 8480 (29.52) |
| No exposure/arrival after 9/14 | 6400 (22.28) |
| Missing | 1105 (3.85) |
| Duration on effort, d | |
| 1st quartile, 1–17 | 7161 (24.93) |
| 2nd quartile, 18–52 | 6788 (23.63) |
| 3rd quartile, 53–114 | 7096 (24.70) |
| 4th quartile, >114 | 6987 (24.32) |
| Missing | 697 (2.43) |
| Worked on pile/pit | |
| Yes | 10 188 (35.46) |
| No | 17 636 (61.39) |
| Missing | 905 (3.15) |
| SSN full or partial sent to registry | |
| Yes | 13 462 (46.86) |
| No | 15 267 (53.14) |
| Date of enrollment | |
| 2002–2005 | 14 141 (49.22) |
| 2006–2009 | 10 513 (36.59) |
| 2010–2013 | 4075 (14.18) |
*
CM&IRG = buildings and grounds cleaning and maintenance and electrical, telecommunications and other installation and repair groups; SSN = social security number.