<div>* I=Intermittent: FEV1 &gt; 80 %, MEF &gt; 65 %,
symptom-free interval &gt; 2 months; II= Mild Persistent: FEV1
&gt; 80 %, MEF &gt; 65 %, symptom-free interval
&lt; 2 months; III= Moderate persistent: FEV1 &lt; 80 %,
MEF &lt; 65 %, symptoms several days a week; IV= Severe
persistent: FEV1 &lt; 60 %, Symptoms during the day and night.
** v, virus-induced; a, allergen-induced; e, exercise-induced; u,
unresolved. ***al, <i>Alternaria</i> species; am, ambrosia; b, birch;
ca, cat; f, <i>Dermatophagoides</i> mix; g, grass pollen mix; n.d., not
done. **** FEV1% / PEF% predicted: Lung function results
Pre-bronchodilation. CRP: C-reactive-protein; FEV1: forced expiratory
volume in 1 second / forced vital capacity; PEF: peak expiratory flow;
RV: Rhinovirus</div>