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Purpose There are many year-round modifiers of chronic rhinosinusitis (CRS). However, it is unknown whether there are seasonal variations in the sinonasal symptom burden of CRS. Methods This was a retrospective cross-sectional study of sinonasal symptom burden measured using the 22-item Sinonasal Outcome Test (SNOT-22) and its four associated nasal, sleep, ear/facial discomfort and emotional subdomains...