Understanding factors that influence prevalence rates of Asthma and Rhinitis in children using ISAAC data

We analyse the influence of enviromental factors on nasal symptoms in children when not having cold or flu. We observe a strong correlation between the prevalence of these nasal symptoms with cold weather (during fall, spring and winter seasons) across different continents. And similarly low prevalence of the nasal symptoms during summer.

In Figures on the right, we plot the proportion of children across European countries who answered "yes" to the question "Have you ever had a problem with sneezing or a runny or a blocked nose when you DID NOT have a cold or the flu?"" and had nasal symptoms during a particular month. We observe that the prevalence of the nasal symptoms have two peaks during winter and spring seasons in Europe. We observe a similar trend across all other countries that participated in the ISAAC program. Please click on each of the links below to view the prevalence plots for rhinitis during different times of the year:

Africa | Asia | Australia | Europe | North America | South America

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Italy, Age group: 6-7.
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Portugal, Age group: 6-7.