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Inicio Allergologia et Immunopathologia Why despite the lower prevalence, is asthma more severe in the semiarid region?
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Vol. 47. Issue 6.
Pages 551-557 (November - December 2019)
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Vol. 47. Issue 6.
Pages 551-557 (November - December 2019)
Original Article
DOI: 10.1016/j.aller.2019.04.002
Why despite the lower prevalence, is asthma more severe in the semiarid region?
M.A.V. Correia Juniora,b,c,
Corresponding author

Corresponding author.
, E.C. Costad, S.W. Sarinhob, J.Â. Rizzob,c, D. Solée, E.S.C. Sarinhob,c
a Postgraduate Program in Hebiatrics and Physical Education, Universidade de Pernambuco, Recife, Brazil
b Postgraduate Program in Child and Adolescent Health, Universidade Federal de Pernambuco, Recife, Brazil
c Center for Research in Allergy and Clinical Immunology, Clinics Department, Universidade Federal de Pernambuco, Recife, Brazil
d Physical Education School, Universidade Federal de Pernambuco, Recife, Brazil
e Universidade Federal de São Paulo, São Paulo, Brazil
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Table 1. Prevalence of asthma and related symptoms in adolescents (13–14 years old) from different centers, determined by the protocol of the International Study of Asthma and Allergies in Childhood (ISAAC).
Introduction and objectives

Asthma is a chronic inflammatory disease which is very prevalent throughout the world, and climatic factors, especially air humidity, have been considered fundamental to its development. This study aims to evaluate the relationship between the climate factor and the severity of asthma episodes in the semiarid region, comparing it to the coast and an intermediate climate region, considering the use of medication as an intervening factor.

Materials and methods

Ecological study in cities with different climatic conditions (semiarid, intermediate region and Coast). Prevailing data was obtained from the International Study of Asthma and Allergies in Childhood (ISAAC) protocol. We evaluated the temperature, humidity and use of drugs for asthma/100,000 inhabitants.


The prevalence of asthma was lower in the semiarid (14%; 95%CI=12.1–15.7) than the intermediate region (19.1%; 95%CI=17.7–20.6) and coast (17.9%; 95%CI=16.6–19.2). Episodes of severe asthma attacks were surprisingly higher in semiarid (10.4%; 95%CI=8.9–11.9) when compared to coast (4.1%; 95%CI=3.4–4.9) and intermediate region (5.0%; 95%CI=4.3–5.8). In the semiarid region, the humidity was lower and the temperature higher than the other cities evaluated. The dispensing of medications was lower in the semiarid region.


Temperature and humidity may have contributed to a lower prevalence and greater severity of asthma in the semiarid region. The dispensing of medications was lower in the semiarid region, indicating that access to both relief and control drugs was lower in this city. The possibility of lack of health care in the semiarid region can also be another explanatory factor associated.

Drug Administration Schedule
Ecological study


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