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Participant demographics among HIV-uninfected individuals (n = 22)
| Age, mean (range) | 50.7 (37–64) |
| Male, n (%) | 15 (68.2) |
| Race, n (%) | |
| White | 12 (54.5) |
| Black | 7 (31.8) |
| Others | 3 (13.6) |
| COPD, n (%) | 8 (36.3) |
| Ever smoker, n (%) | 12 (54.5) |
| Pack-years, median (range) | 6.2 (0–54) |
