TABLE 2.
Demographics of participants in the retrospective cohort study (n=103)
| Variable | Distribution |
| Age# years (n=98) | |
| Mean±sd | 54.8±12.9 |
| Median (range (IQR)) | 55.0 (67 (17)) |
| Gender | |
| Male (n=65) | 63±9 (54–72) |
| Female (n=36) | 35±9 (26–44) |
| Smoking status | |
| Never smoker (n=34) | 33±9 (24–42) |
| Ex-smoker (n= 39) | 38±9 (29–47) |
| Current smoker (n=16) | 16±7 (9–23) |
| Dust exposure¶ | |
| Yes (n=35) | 34±9 (25–43) |
| No (n=55) | 53±10 (43–63) |
| Disease severity score+ | |
| 1 (n=23) | 22±8 (14–30) |
| 2 (n=25) | 24±8 (16–32) |
| 3 (n=16) | 16±7 (8–23) |
| 4 (n=12) | 12±6 (6–18) |
| 5 (n=8) | 8±5 (3–13) |
| Symptoms | |
| Yes (n=62) | 60±10 (50–70) |
| No (n=28) | 27±9 (18–36) |
| Complications | |
| Yes (n=35) | 34±9 (25–43) |
| No (n=68) | 66±9 (57–75) |
Data is presented as %±95% CI (lower–upper) unless otherwise stated. IQR: interquartile range. #: age at granulocyte-macrophage colony-stimulating factor autoantibody measurement; ¶: dust exposure was based on self-reporting by patients/physicians; +: disease severity score was defined as described in the Methods section.