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. 2019 Oct 17;12(10):100069.
doi: 10.1016/j.waojou.2019.100069. eCollection 2019 Oct.

History of allergic rhinitis and risk of asthma; a systematic review and meta-analysis

Hamid Reza Tohidinik  1   2   3 , Narmeen Mallah  3   4 , Bahi Takkouche  3   4
Affiliations

History of allergic rhinitis and risk of asthma; a systematic review and meta-analysis

Hamid Reza Tohidinik et al. World Allergy Organ J. .

Abstract

Background: Allergic rhinitis has been suspected to be a risk factor for asthma in several studies but this association is not firmly established. The objective of this study was to synthesize the evidence of the association between allergic rhinitis and the risk of asthma through a systematic review and meta-analysis.

Methods: We performed a search in Medline, Scopus, ISI Proceedings databases and other databases from inception until February 2019, followed by manual search to identify potentially relevant case-control and cohort studies that reported relative risk estimates and confidence intervals of the association between allergic rhinitis and asthma. Cross-sectional studies were excluded. Pooled odds ratios (ORs) and 95% confidence intervals (CIs) were calculated using fixed and random effects models and quality of studies was assessed through a modified version of the Newcastle-Ottawa scale.

Results: Twenty-nine eligible studies, 22 cohort and 7 case-control studies, with a total of 274489 subjects, were included in the meta-analysis. The results show that history of allergic rhinitis is significantly associated with the occurrence of asthma (OR = 3.82; 95% CI: 2.92-4.99). European studies showed a stronger association (OR = 4.35; (95% CI: 3.12-6.06) than non-European studies (OR = 2.75; 95% CI: 2.16-3.50), and case-control studies showed a stronger association (OR = 4.71; 95% CI: 3.58-6.17) than cohort studies (OR = 3.42; 95% CI: 2.60-4.50).

Conclusions: This meta-analysis shows that allergic rhinitis is strongly associated with asthma. Further prospective studies on the effect of treatment of allergic rhinitis on the development of asthma are needed. Relief of airway allergic manifestations may need dual control of allergic rhinitis and asthma.

Registration: PROSPERO database with registration number CRD42017055156.

Keywords: Allergic rhinitis; Asthma; Meta-analysis.

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Figures

Fig. 1
Fig. 1
Flow diagram of study selection in systematic review and meta-analysis of history of allergic rhinitis and risk of asthma
Fig. 2
Fig. 2
Forest plot of the association between history of allergic rhinitis and risk of asthma (random effects)
Fig. 3
Fig. 3
Funnel plot of association between history of allergic rhinitis and risk of asthma
Fig. 4
Fig. 4
Cumulative forest plot of the association between history of allergic rhinitis and risk of asthma
See this image and copyright information in PMC

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