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Table 5 Mean baseline values and mean changes in lung function during the follow-up period stratified by the presence of chronic respiratory symptoms.

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

Lung function Baseline values Changes p* Baseline values Changes p*
Indices Mean (SD) Mean (SD)   Mean (SD) Mean (SD)  
Cleaners       
  With morning cough n = 28   Without morning cough n = 10  
FEV1 (L/min) 3.49(0.73) -0.12(0.19) 0.003 3.37(0.46) -0.047(0.15) 0.344
FVC (L) 4.05(0.73) -0.034(0.34) 0.603 4.05(0.59) -0.049(0.19) 0.450
FEV1/FVC 85.76(6.56) -2.18(3.79) 0.005 83.59(5.65) -0.34(1.38) 0.458
  With shortness of breath n = 27   Without shortness of breath n = 11
FEV1 3.53(0.71) -0.08(0.16) 0.016 3.27(0.55) -0.14(0.22) 0.056
FVC 4.09(0.70) -0.04(0.21) 0.292 3.94(0.67) -0.02(0.48) 0.879
FEV1/FVC 85.92(5.73) -1.13(1.79) 0.003 83.4(7.61) -3.08(5.64) 0.100
Production workers      
  With morning cough n = 13   Without morning cough n = 20  
FEV1 3.21(0.46) -0.013(0.25) 0.848 3.24(0.61) -0.023(0.25) 0.722
FVC 3.88(0.47) -0.063(0.31) 0.490 3.78(0.65) -0.004(0.29) 0.946
FEV1/FVC 83.18(5.13) 0.39(2.26) 0.544 84.82(6.49) -0.25(4.88) 0.381
  With shortness of breath n = 15   Without shortness of breath n = 18
FEV1 3.36(0.55) -0.09(0.23) 0.155 3.12(0.55) -0.093(0.28) 0.184
FVC 3.84(0.50) -0.016(0.17) 0.734 3.80(0.65) -0.037(0.37) 0.682
FEV1/FVC 85.95(5.04) -0.913(2.88) 0.240 82.69(6.4) -2.55(5.31) 0.057
  1. * paired t-test