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Table 1 ILD study population characteristics

From: Clustering of lung diseases in the family of interstitial lung disease patients

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)
  1. 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