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05). Male predominance was observed with two peaks in the age distribution of patients from the 2010s. The proportion of patients with moderate-to-severe nasal obstruction and itching of the nose/eye increased (each   0.05) and that of patients with minor symptoms such as olfactory disturbances, cough, sore throat, and fatigue also increased (all   0.01) in the 2010s. Allergen reactivity and type and symptom severity in Korean AR patients significantly varied between the 1990s and 2010s. Our results may therefore be