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Age-specific incidence of allergic and non-allergic asthma
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2020 (English)In: BMC Pulmonary Medicine, ISSN 1471-2466, E-ISSN 1471-2466, Vol. 20, no 1, article id 9Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Onset of allergic asthma has a strong association with childhood but only a few studies have analyzed incidence of asthma from childhood to late adulthood in relation to allergy. The purpose of the study was to assess age-specific incidence of allergic and non-allergic asthma.

METHODS: Questionnaires were sent to 8000 randomly selected recipients aged 20-69 years in Finland in 2016. The response rate was 52.3% (n = 4173). The questionnaire included questions on e.g. atopic status, asthma and age at asthma diagnosis. Asthma was classified allergic if also a physician-diagnosed allergic rhinitis was reported.

RESULTS: The prevalence of physician-diagnosed asthma and allergic rhinitis were 11.2 and 17.8%, respectively. Of the 445 responders with physician-diagnosed asthma, 52% were classified as allergic and 48% as non-allergic. Median ages at diagnosis of allergic and non-allergic asthma were 19 and 35 years, respectively. Among subjects with asthma diagnosis at ages 0-9, 10-19, 20-29, 30-39, 40-49, 50-59 and 60-69 years, 70, 62, 58, 53, 38, 19 and 33%, respectively, were allergic. For non-allergic asthma, the incidence rate was lowest in children and young adults (0.7/1000/year). It increased after middle age and was highest in older age groups (2.4/1000/year in 50-59 years old).

CONCLUSIONS: The incidence of allergic asthma is highest in early childhood and steadily decreases with advancing age, while the incidence of non-allergic asthma is low until it peaks in late adulthood. After approximately 40 years of age, most of the new cases of asthma are non-allergic.

Place, publisher, year, edition, pages
BioMed Central, 2020. Vol. 20, no 1, article id 9
Keywords [en]
Adolescent, Adult, Age-specific, Allergic, Asthma, Child, Incidence, Non-allergic, Onset, Prevalence
National Category
Respiratory Medicine and Allergy
Identifiers
URN: urn:nbn:se:umu:diva-167776DOI: 10.1186/s12890-019-1040-2ISI: 000513558600001PubMedID: 31924190Scopus ID: 2-s2.0-85077765123OAI: oai:DiVA.org:umu-167776DiVA, id: diva2:1390900
Available from: 2020-02-03 Created: 2020-02-03 Last updated: 2020-03-10Bibliographically approved

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