Table 2: Comparison of pulmonary function tests among dust-exposed and control groups.

Variables Exposed Group (n=174) Control Group (n=93) P
FVC (%) 86.55±13.77 105.05±21.50 t=-8.540, df=265
p-value= <0.001
FEV1 (%) 88.06±16.8 105.81±21.55 t=-7.43, df=265
p-value= <0.001
FEV1/FVC (%) 103.03±18.17 93.3±12.49 t=4.598, df=265
p-value= <0.001
PEF (%) 89.82±22.58 98.09±20.60 t=-2.940, df=265
p-value= 0.004