In another population-based study conducted in the north-east of Iran, the prevalence of asthma symptoms had an increasing trend and was highest in older age groups: 7% in 60-64 years, 8.4% in 65-69 years, and 8.4% 70-104 years [ 18 ].
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In another population-based study conducted in the north-east of Iran, the prevalence of asthma symptoms had an increasing trend and was highest in older age groups: 7% in 60-64 years, 8.4% in 65-69 years, and 8.4% 70-104 years [ 18 ].