Lung function trajectories using different reference equations in a birth cohort study up to the age of 20 years

Lung function trajectories using different reference equations in a birth cohort up to the age of 20 years show a drop in FEV 1 and FVC of both asthmatic and nonasthmatic subjects at the age of 13 years regardless of which reference equations were used http://ow.ly/hxGJ30ktUYE