Table 1:
Baseline demographic characteristics of the World Trade Center Screening, Monitoring, and Treatment Program study population
| Participants (N=27 449) |
|
|---|---|
| Median age (years)* | 38 (33–44) |
| Sex | |
| Male | 23 468 (86%) |
| Race | |
| White | 15 657 (57%) |
| Black | 2963 (11%) |
| Asian | 373 (1%) |
| Other | 755 (3%) |
| Unknown | 7701 (28%) |
| Hispanic† | 6475 (31%) |
| Smoking‡ | |
| Current | 4054 (15%) |
| Former | 6315 (24%) |
| Never | 15 897 (61%) |
| Occupation§ | |
| Protective services or military | 12 273 (48%) |
| Construction | 5956 (23%) |
| Electrical or telecommunication repair workers | 1794 (7%) |
| Transportation or material movers | 1128 (4%) |
| Other occupations | 4025 (16%) |
| Unemployed or retired | 477 (2%) |
| Union member | 22 558 (83%) |
| Working status at the site¶ | |
| Worker | 21 287 (81%) |
| Volunteer | 2768 (11%) |
| Worked and volunteer | 2127 (8%) |
| WTC exposure category∥ | |
| Low | 3235 (14%) |
| Intermediate | 14 769 (65%) |
| High | 4019 (18%) |
| Very high | 749 (3%) |
| Directly exposed to the dust cloud from collapse | 5059 (21%) |
| Started working on 9/11 | 12 041 (44%) |
| Year of enrolment into the programme¶ | |
| ≤2004 | 11 296 (41%) |
| 2005–07 | 9509 (35%) |
| ≥2008 | 6643 (24%) |
Data are number (%) or median (IQR). 9/11=Sept 11, 2001. WTC=World Trade Center.
*
Age on 9/11.
†
Data missing for 6206 rescue and recovery workers who did not answer the question about ethnic origin.
‡
Data missing for 1183 rescue and recovery workers.
§
Data missing for 1796 rescue and recovery workers.
¶
Data missing for 1267 rescue and recovery workers.
∥
Data missing for 4677 rescue and recovery workers.