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Table 1 Demographic, anthropometric 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*
Age
  < 35 years old 162 (53.1%) 7.76 ± 1.95 0.52 7.60 ± 2.05 0.86 5.16 ± 0.43 0.49 10.72 ± 0.35 0.31 17.6 ± 6.70 0.14
  ≥ 35 years old 143 (46.9%) 7.75 ± 1.37   8.40 ± 2.20   5.25 ± 0.83   11.7 ± 1.65   21.4 ± 9.96  
Sex
 Male 290 (95.1%) 7.7 ± 1.63 0.63 8.01 ± 2.06 0.56 5.3 ± 0.60 0.81 10.97 ± 0.98 0.87 19.76 ± 8.42 0.46
 Female 15 (4.9%) 9 ± 2.6 7.04 ± 3.26 2.8 ± 0.93 15.25 ± 0.53 13.75 ± 8.66
BMI
  ≤ 25 158 (51.8%) 8.3 ± 0.98 0.10 8.06 ± 1.72 0.37 5.12 ± 0.94 0.26 12.66 ± 0.16 0.06 18.22 ± 6.95 0.23
  > 25 147 (48.2%) 7.05 ± 2.43 7.23 ± 2.55 5.27 ± 0.27 9.25 ± 2.18 20.08 ± 9.60
Smoking
 Yes 43 (14.1%) 7.9 ± 1.4 0.005 9.95 ± 1.20 0.003 6.20 ± 0.35 0.70 14.4 ± 0.82 0.30 33.20 ± 10.60 0.40
 No 262 (85.9%) 7.62 ± 2.20 7.5 ± 2.70 5.03 ± 0.66 10.60 ± 1.25 16.30 ± 7.85
History of allergic disease
 Yes 45 (14.8%) 8.40 ± 1.90 0.86 8.50 ± 1.90 0.84 5.60 ± 0.73 0.058 12.50 ± 0.50 0.75 16.30 ± 6.20 0.45
No 260 (85.2%) 7.70 ± 1.65   7.90 ± 2.15   5.10 ± 0.85   11 ± 10.4   20.02 ± 8.06  
  1. BMI body mass index, 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