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Table 2 Lung function 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) Minerals dust (n = 107) Organic dust (n = 97) overall p
FVC (%) Mean (SD) 103.9 3 (12.3) 99.5 1 (12.3) 97.81,2 (12.9) 101.5 2,3 (13) 102.5 2,3 (12) 0.03
FEV1 (%) Mean (SD) 102.7 3 (12.4) 98.3 1,2 (12.9) 96.2 1 (13.4) 101.1 2,3 (12) 101.8 2,3 (13.8) 0.01
FEV1/FVC (%) Mean (SD) 82.1 (6.0) 82.2 (6.2) 81.8 (7.3) 82.5 (5.8) 81.7 (6.8) NS
PEF (%) Mean (SD) 92.5 3 (15.6) 87.1 2 (14.8) 81.8 1 (15.5) 88.5 2,3 (15.5) 90.6 2,3 (17) <0.0001
MEF25 (%) Mean (SD) 89.7 2 (19.5) 84.3 1,2 (18) 80.8 1 (19.2) 86.6 2 (18.4) 88.4 2 (21.9) <0.0001
MEF50 (%) Mean (SD) 85.9 (22.2) 81.5 (23.4) 79.3 (23.9) 82.9 (22.2) 85.1 (24.6) NS
MEF75 (%) Mean (SD) 74.2 (21.6) 72.2 (20.8) 70.3 (24.6) 74.5 (20.1) 74.2 (23.1) NS
MMEF (%) Mean (SD) 79 2 (21.2) 74.9 1,2 (22.8) 72 1 (22.7) 76.4 1,2 (19.5) 77.8 1,2 (23) 0.16
PD20 Number (%) 4 (3)1 6 (5)1,2 11 (11)2 6 (6)1,2 4 (4)1,2 NS
  1. FVC (Forced Vital Capacity), FEV1 (Forced Expiratory Volume in 1 Second), PEF (Peak Expiratory Flow), MEF (Maximal Expiratory Flow at given percentage of FVC), MMEF (Maximal Mid-Expiratory Flow), all expressed as percent predicted (according to Quanjer et al. [15]), except for FEV1/FVC where real percentage is given (ratio × 100). PD20: number of subjects with a measurable PD20 (provocative dose of histamine leading to a 20% decrease in FEV1 with respect to the starting value) in the histamine test (n values of group lower by one in each group except in welders).
  2. 1,2,3: groups with the same number in exponent do not differ significantly