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Table 2 Occupational factors and pulmonary function parameters of participants

From: Evaluation of pulmonary function among detergent powder factory workers- a cross sectional study in Semnan, Iran

Variables Number (%) Pulmonary function parameters
ΔFVC (%) P value ΔFEV1 (%) P value ΔFEV1/FVC(%) P value ΔPEF (%) P value ΔFEF (25–75)(%) P value*
Job title
 Administrative staff 17 (5.6%) 6.61 ± 2.53 0.87 7.7 ± 3.94 0.57 4.55 ± 0.59 0.70 12.61 ± 0.59 0.82 19.47 ± 4.23 0.60
 Driver 15 (4.9%) 5.48 ± 1.20   6. 04 ± 1.20   5.72 ± 047   6.74 ± 2.67   16.25 ± 10.87  
 Worker 273 (89.5%) 7.93 ± 1.65 8. 07 ± 2.06 5.22 ± 0.67   11.31 ± 0.90   19.71 ± 8.34
Work experience
  ≤ 7 years 157 (51.5%) 8.14 ± 1.92 0.57 8.58 ± 2.24 0.79 5.32 ± 0.71 0.75 12.45 ± 0.24 0.24 16.21 ± 8.20 0.93
  > 7 years 148 (48.5%) 7.31 ± 1.42   7.27 ± 2.00   5.09 ± 0.52   9.67 ± 1.73   22.55 ± 8.32  
Using mask
 Never 63 (20.7%) 8.4 ± 0.65   8.07 ± 1.22   3.45 ± 0.75   12.90 ± 1.50   26.65 ± 11.15  
 Sometimes 35 (11.5%) 4.30 ± 2.82 0.38 5.80 ± 4.85 0.014 5.50 ± 3.20 0.70 6.08 ± 6.70 0.005 17.40 ± 9.70 0.002
 Usually 207 (67.9%) 8.00 ± 1.80   8.20 ± 1.80   5.50 ± 0.14   11 ± 0.85   17.70 ± 5.80  
Exposed to environmental risk factors
 Exposed 240 (78.7%) 7.70 ± 1.50 0.48 1.90 ± 17.90 0.36 5.40 ± 0.67 0.72 11.20 ± 0.90 0.90 19.90 ± 8.45 0.71
 No exposure 65 (21.30%) 8.09 ± 2.30   2.90 ± 8.09   4.50 ± 0.41   11.1 ± 1.10   18.25 ± 7.45  
  1. FVC forced vital capacity, FEV1 forced expiratory volume, PEF peak expiratory flow, FEF (25–75) forced expiratory flow at 25 and 75% of the pulmonary volume; Values are the mean ± standard deviation. Δ; differences between before and after of shift-work
  2. *Paired t-test and ANOVA