Table1:Spirometry exacerbation rates of earlierlater COPD groups
Earlier
Later
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