Multi‐symptom asthma as an indication of disease severity in epidemiology

Eczema among adults: prevalence, risk factors and relation to airway diseases. Results from a large-scale population survey in Sweden

“…19,25 Severe asthma was defined as multisymptom asthma using a composite definition. 26 Further definitions included: growing up on a farm, 'Did you live on a farm during your first 5 years of life?' Family history of allergy, 'Has any of your parents or siblings ever had allergic eye or nose problems (hay fever)?'…”