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Table 3 Prevalence of chronic respiratory symptoms among exposed and control workers in two cement factories in 2009 and 2010

From: Lung function reduction and chronic respiratory symptoms among workers in the cement industry: a follow up study

  2009    2010    Significance level p
2009 Vs 2010
Symptoms Cleaners (n = 38) Pw (n = 33) Controls (n = 20) Cleaners (n = 38) Pw (n = 33) Controls (n = 20) Cleaners Pw controls
  n (%) n (%) n (%) n (%) n (%) n (%)    
Morning cough 28(73.7) 13(39.4) 3(15) 18(47.4) 11(33.3) 2(10) 0.008 0.317 0.655
Cough day/night 22(57.9) 9(27.3) 2(10) 17(44.7) 11(33.3) 1(5) 0.166 0.414 0.564
Cough with sputum 28(73.7) 14(42.4) 3(15) 16(42.1) 10(30.3) 2(10) 0.003 0.102 0.655
Cough with sputum, day/night 21(55.3) 5(15.2) 2(10) 15(39.5) 10(30.3) 1(5) 0.083 0.025 0.564
Shortness of breath, when hurrying 27(71.1) 15(45.5) 2(10) 21(55.3) 14(42.4) 2(10) 0.109 0.763 1.000
Shortness of breath, when walking 4(10.5) 4(12.1) 0(0) 2(5.3) 0(0) 0(0) 0.414 0.046 1.000
Stop for breath 4(10.5) 2(6.1) 0(0) 1(2.6) 0(0) 0(0) 0.180 0.157 1.000
Wheezing 9(23.7) 8(24.2) 1(5) 13(34.2) 7(21.2) 0(0) 0.248 0.739 0.317
Chest tightness 17(44.7) 9(27.3) 1(5) 15(39.5) 12(36.4) 2(10) 0.564 0.257 0.564
  1. Pw = Production workers, Wilcoxon signed ranks test