Table1:Spirometry & exacerbation rates of earlier & later COPD groups

 EarlierLater
Mean FEV1(L)(SD)1.63(0.45)*1.02(0.33)*
Mean FVC(L)(SD)3.04(0.92)*2.43(0.77)*
Mean FEV1/FVC(SD)0.55(0.11)*0.44(0.12)*
Median Exacerbations/yr(IQR)1.65(0.70-2.40)*1.99(1.07-3.19)*

  • *p<0.05