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Table 1 Characteristics of the population

From: Occupational risk factors for idiopathic pulmonary fibrosis in Southern Europe: a case-control study

  UIP cases (n = 69) Controls (n = 277) p
Males, n (%) 50 (72.5) 150 (54. 2) < 0.01
Age, mean ± SD 75 (± 14) 71 (± 13) 0.02
Smoking
 No smokers 27 (39.1) 110 (39.7) NS
 Eversmokers 42 (60.9) 167 (60.3)
Atopy, n (%) 5 (7.2) 25 (9.0) NS
Rhinitis, n (%) 22 (31.9) 75 (27.1) NS
Family history of pulmonary fibrosis, n (%) 3 (4.5) 3 (1.1) 0.09
Family autoimmunity, n (%) 7 (10.1) 33 (11.9) NS
Work duration (years), mean ± SD 38.6 (± 10.6) 35.4 (± 10.5) 0.02
Job title
 Legislators, entrepreneurs, scientific and intellectual professions 4 (5.8) 21 (7.6) NS
 Technical, social and health professions 9 (13) 62 (22.4) NS
 Office workers 11 (15.9) 48 (17.3) NS
 Dealers and service workers 11 (15.9) 63 (22.7) NS
 Drivers or operatives of vehicles and installations 6 (8.7) 42 (15.2) NS
 Construction workers 14(20.3) 26 (9.4) 0.02
 Food industry workers 5 (7.2) 30 (10.8) NS
 Textile industry workers 9 (13) 36 (13) NS
 Wood industry workers 6 (8.7) 15 (5.4) NS
 Metallurgical and steel industry 8 (11.6) 6 (2.2) 0.02
 Farmers, vets and gardeners 30 (43.5) 51 (18.4) < 0.01
 Chemical industry 2 (2.9) 0 (0) 0.04