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Characteristics among participants (n = 13)
| n (%) or mean (SD) | |
|---|---|
| Sex | |
| Male | 11 (84.6%) |
| Female | 2 (15.4%) |
| Race | |
| White | 12 (92.3%) |
| Hispanic | 1 (7.7%) |
| Age (year) | 25.7 (3.8) |
| Visit order for diesel exposure | |
| First | 6 (46.2%) |
| Second | 4 (30.8%) |
| Third | 3 (23.1%) |
| Visit order for clean air exposure | |
| First | 4 (30.8%) |
| Second | 3 (23.1%) |
| Third | 6 (46.1%) |
