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Table 1 Characteristics of the study population stratified by exposure group

From: Respiratory function and bronchial responsiveness among industrial workers exposed to different classes of occupational agents: a study from Algeria

  Reference (n = 123) Welders n = 114) Solvents (n = 106) Mineral dust (n = 107) Organic dust (n = 97) Total (n = 546) overall p
Age (years) Mean (SD) 38.3 1,2 (8.3) 37.61 (7.6) 39.3 1,2 (6.4) 40.1 2,3 (7.8) 41.83 (8.3) 39.3 (7.8) 0.0001
Height (cm) Mean (SD) 173 (6.7) 172.3 (5.9) 171.4 (6.7) 171.8 (6.8) 172.3 (5.8) 172.2 (6.4) NS
Weight (kg) Mean (SD) 69.3 2,3 (10.9) 65.61 (10.5) 66.2 1,2 (11.5) 67.3 1,2 (11.6) 713 (12.4) 65.8 (11.5) 0.003
Duration exposure Mean (years) (SD) 18 4 (8.5) 13.9 2,3 (5.7) 11.91 (4.9) 12.8 1 (6.6) 14.6 3,4 (5.9) 13.8 (6.6) <0.0001
Monthly salary (DA) Mean (SD) 11022 4 (1929) 8383 1 (1692) 99723 (1842) 9262 2 (2053) 9989 3 (1622) 9739 (2049) <0.0001
Smoking Habit        
   Non-smokers n (%) 43 (35) 27 (24) 26 (25) 29 (27) 30 (31) 155 (28.4) NS
   Ex-smokers n (%) 26 (25) 25 (22) 17 (13) 30 (28) 27 (28) 125 (22.8) NS
   Smokers n (%) 54 1 (44) 62 1,2 (54) 62 2 (59) 48 1 (45) 40 1 (41) 256 (48.8) 0.04
   Cigarettes/day* Mean (SD) 15.2 1 (8.1) 17 1 (11) 18.9 2 (9.1) 16.4 1,2 (8.1) 17.3 1,2 (10.5) 16.9 (9.4) NS
   Pack years* Mean (SD) 12.9 1 (6.7) 12 1 (5.9) 16.5 2 (6.7) 11.9 1 (6.8) 13.1 1 (5.8) 13.3 (6.4) 0.04
Allergy n (%) 10 1,2 (8.1) 3 1 (2.6) 13 2 (12.4) 4 1 (3.8) 5 1,2 (5.1) 35 (6.4) 0.02
Asthma n (%) 3 (2.4) 3 (2.6) 2 (1.9) 0 (0) 1 (1) 9 (1.6) NS
  1. 1,2,3: Groups with the same number in exponent do not differ significantly. *excluding never smokers.
  2. DA: Algerian Dinar
  3. Allergy based on reported symptoms, use of medication for allergy or the presence of hayfever or nasal allergies.