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Table 4 Lung function among workers in two cement plants and among controls at baseline (2009) and at follow-up (2010)

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

Lung function Cleaners   Production workers Controls  
Indices   (n = 38) p* (n = 33) p* (n = 20) p*
FEV1 (L/min) 2009 3.46(0.67)   3.23(0.55)   3.33(0.76)  
  2010 3.36(0.65)   3.19(0.57)   3.30(0.70)  
ΔFEV1   -0.099(0.18) 0.002 - 0.092(0.26) 0.05 -0.032(0.27) 0.61
FVC (L) 2009 4.05(0.69)   3.82(0.58)   3.84(0.77)  
  2010 4.01(0.65)   3.79(0.53   3.80(0.72)  
Δ FVC   -0.038(0.31) 0.45 - 0.027(0.30) 0.60 -0.041(0.36) 0.62
FEV1/FVC 2009 85.19(6.3)   84.17(5.96)   86.32(4.34)  
  2010 83.49(7.5)   82.36(6.58)   85.83(6.01)  
ΔFEV1/FVC   -1.70(3.41) 0.004 -1.81(4.40) 0.02 - 0.485(3.52) 0.55
  1. *Paired t-test