Direct and indirect costs of adult patients with chronic rhinosinusitis with nasal polyps

Background: European direct and indirect cost data is missing for patients with chronic rhinosinusitis with nasal polyps (CRSwNP). This study was aimed to establish the economic burden of CRSwNP based on a Dutch cohort of patients. Methods: A cross-sectional study was performed in adult patients with CRSwNP (N=115) to calculate mean annual direct medical costs and indirect costs per patient with CRSwNP. Outpatient visits, general practitioner visits, first aid visits, hospitalisation and patient travel expenses were measured with the iMTA medical consumption questionnaire. Missed workdays (absenteeism) and decreased productivity during paid work (presenteeism) or during daily life were measured with the and the iMTA productivity cost questionnaire. Results: Total direct costs were €1501 per patient/year, primarily due to outpatient department visits and hospitalisation. Indirect costs were €5659 per patient/year, with productivity losses as major cost expense. Conclusion: Adult patients with CRSwNP have higher indirect costs than direct costs and this forms a substantial burden to society. Total annual costs of patients with CRSwNP are estimated to be 1,9 billion/year in the Netherlands.