Table 1.
ILD study population characteristics
| Diagnosis group | Questionnaire provided, N | Questionnaire completed, N (%) | Male, N (%) | Age in years, mean (sd) | Per patient reported relatives with disease, mean (sd) | Per patient reported 1st degree relatives with disease, mean (sd) |
|---|---|---|---|---|---|---|
| Total | 1358 | 1164 (86) | 669 (58)* | 54.0 (13.6)* | 7.1 (5.1) | 3.3 (2.2)* |
| Sarcoidosis | 744 | 644 (87) | 368 (57) | 47.7 (11.0) | 7.1 (5.1) | 3.0 (2.0) |
| HP | 102 | 87 (85) | 41 (47) | 60.5 (11.4) | 7.6 (5.5) | 3.9 (2.3) |
| IPF | 128 | 109 (85) | 86 (79) | 65.3 (10.3) | 6.4 (4.4) | 4.0 (2.3) |
| uPF | 126 | 103 (82) | 72 (70) | 67.1 (10.1) | 6.4 (4.8) | 4.0 (2.5) |
| non-IPF IIP | 68 | 54 (79) | 23 (43) | 58.3 (13.1) | 6.5 (5.0) | 3.3 (2.0) |
| aidILD | 106 | 93 (88) | 50 (54) | 58.9 (12.4) | 7.1 (4.7) | 3.6 (2.2) |
| oILD | 84 | 74 (88) | 29 (39) | 57.8 (15.4) | 8.0 (5.6) | 3.6 (2.2) |
HP = hypersensitivity pneumonitis; IPF = idiopathic pulmonary fibrosis; uPF = unclassifiable pulmonary fibrosis; non-IPF IIP = idiopathic interstitial pneumonia other than IPF; aidILD = autoimmune ILD; oILD = other ILD. Differences in study population characteristics were tested with ANOVA (post-hoc Scheffe’s) for continues and Chi squared for dichotomous variables; and associations between age and reported first degree relatives with linear regression analysis. *p < 0.05