Table 1.
World Trade Center (WTC) responder sample characteristics
| Characteristic | Overall | Cognitively unimpaired |
Early-onset dementia |
t-test/x2 |
|---|---|---|---|---|
| N = 99 | N = 51 | N = 48 | p | |
| Age | 56.38 (0.52) | 56.42 (0.63) | 56.32 (0.86) | 0.926 |
| PTSD—DSM‐IV (SCID‐IV) | ||||
| No | 52.50% | 53.90% | 51.10% | 0.782 |
| Yes | 47.50% | 46.20% | 48.90% | |
| APOEε4 status (n = 91) | 0.227 | |||
| APOEε4 + | 21.21% | 21.57% | 20.83% | |
| APOEε4- | 67.68% | 72.55% | 62.50% | |
| Unknown | 11.11% | 5.88% | 16.67% | |
| Sex | ||||
| Male | 85.30% | 80.80% | 76.60% | 0.612 |
| Female | 14.70% | 19.20% | 23.40% | |
| Minority status | ||||
| White | 77.80% | 86.50% | 68.10% | 0.087 |
| Black | 10.10% | 5.80% | 14.90% | |
| Hispanic | 12.10% | 7.70% | 17.00% | |
| Occupation | ||||
| NYPD | 56.60% | 60.80% | 52.10% | 0.383 |
| Other | 43.40% | 39.20% | 47.90% | |
| Education | ||||
| High school or less | 23.20% | 17.70% | 29.20% | 0.359 |
| Some college | 47.50% | 49.00% | 45.80% | |
| University degree | 29.30% | 33.30% | 25.00% | |
Values expressed as means (standard deviations) or percentages (%); p-values from Welch’s t-tests or chi-squared test comparisons examine the extent to which noted characteristics differ across groups; PTSD, post-traumatic stress disorder; APOEε4, the ε4 allele of the Apolipoprotein E (APOE) gene; DSM-IV (SCID-IV), Structured Clinical Interview using the Diagnostic and Statistical Manual IV; NYPD, New York Police Department