Research Article
Development of a Physiological Frailty Index for the World Trade Center General Responder Cohort
Table 2
Summary of demographic and exposure characteristics of the study sample.
| Characteristics | Summary statistics |
| Sample size | 7346 | Age at 9/11 (median, IQR, range) | 39 (34–45, 25–74) | Age at index visit (median, IQR, range) | 51 (46–57, 40–85) | Sex | | Female | 1229 (16.7%) | Male | 6117 (83.3%) | Race/ethnicity | | White | 3983 (54.2%) | Black | 1084 (14.8%) | Hispanic | 2100 (28.6%) | Other | 179 (2.4%) | Smoking status at index visit | | Never | 4484 (61.0%) | Former | 2289 (31.2%) | Current | 573 (7.8%) | Pre-9/11 occupation | | Construction | 1781 (24.2%) | Protective | 3466 (47.2%) | CM and IRG | 709 (9.7%) | Other | 1390 (18.9%) | WTCHP enrollment year | | 2002–2005 | 3594 (48.9%) | 2006–2008 | 2296 (31.3%) | >2008 | 1456 (19.8%) | Index visit year | | 2012 | 1574 (21.4%) | 2013 | 2399 (32.7%) | 2014 | 2693 (36.7%) | 2015 | 468 (6.4%) | 2016 | 212 (2.9%) | Educational attainment | | High school or less | 2263 (30.8%) | >High school | 5083 (69.2%) | Exposure severity | | Low | 990 (13.5%) | Intermediate | 4793 (65.2%) | High/very high | 1563 (21.3%) |
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: cleaning/maintenance of buildings and grounds; IRG: installation/repair groups (electrical, telecommunications, and others); : WTC Health Program. |