TABLE 3

Coefficient of variation for adjusted and unadjusted forced expiratory flows (FEFs)

Adjusted FEFx/FVC
coefficient of variation %
Unadjusted FEFx coefficient of variation %p-value
Males
 FEF2519.218.30.00027
 FEF5023.925.10.00097
 FEF7536.038.75.81×10−5
 FEF25–7525.427.26.23×10−7
Females
 FEF2518.718.60.739
 FEF5022.924.91.24×10−13
 FEF7539.843.21.51×10−10
 FEF25–7525.828.69.46×10−19

FEFx: forced expiratory flow at 25%, 50%, 75% and 25–75% of forced vital capacity (FVC).