Fig. 2

The relationship between SA (g/dL) and FVC%pred, FEV1%pred, FEF25–75%pred, FEV1/FVC%pred. The solid red line represents the smooth curve fit between variables. Blue bands represent the 95% of confidence interval from the fit. (A) SA and FVC%pred; (B) SA andFEV1%pred; (C) SA FEF25-75%pred and (D) SA and FEV1/FVC%pred