The Effect of Allergic Rhinitis on Educational Outcomes

Inclusion Criteria: * The main study population (cases) consists of children who have been diagnosed with AR before turning 13. Diagnosis of AR will be identified by dispensations of prescribed AR medications, ICD-10 codes of AR-related hospitalisations and reimbursement codes for AR-related healthcare contacts in the primary healthcare sector. At least two dispensed prescriptions of product containing intranasal corticosteroids (INCS) or antihistamines during the same calendar year for two consecutive years OR at least one visit with the primary healthcare sector with registered AR consultations AND at least one dispensed prescriptions of product containing INCS or antihistamines OR at least one contact with the hospital sector with an ICD-10 code for AR (primary or secondary diagnosis). Exclusion Criteria: * Children with their first AR-related healthcare contact or first AR-specific dispensed prescription at the age of 13 or older will be excluded.