Asthma prevalence in Iranian guidance school children, a descriptive meta-analysis.

data collection in both international and regional levels.[ 5 ] Phase one of the ISAAC was developed based on the considerable interest, for an estimation of the current prevalence and projection of future trend of asthma as well as other allergic diseases in western and developing countries.[ 6 ] An increasing trend of prevalence of asthma started from the 1970s, and now, the worldwide prevalence of this disease has been estimated to be 4% to 7%.[ 7 ] The results of the first International Study of Asthma and Allergies in Childhood (ISAAC) showed that the prevalence of asthma symptoms in different countries va

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