Abstract
BackgroundDespite the low prevalence for all patients with asthma, those with severe disease account for a disproportionately large economic burden. ObjectiveTo evaluate current direct health care and productivity loss costs associated with patients with asthma receiving Global Initiative for Asthma Step 4/5 therapy (“G4/5 asthma”) in the United States. MethodsAsthma patients aged 12 years or older were identified in the IBM MarketScan Research Databases between January 1, 2012 and December 31, 2015. Patients were indexed on their earliest medical claim for asthma and were required to have at last 2 years of continuous eligibility. The G4/5 asthma classification required 1 or more medium- or high-dosage inhaled corticosteroids (ICS)/long-acting beta-agonist (LABA) claims, 1 or more omalizumab claims, or systemic corticosteroids covering at least 50% of the 12-month baseline period. The European Respiratory Society/American Thoracic Society criteria for severe uncontrolled asthma were modified for claims data and used to identify patients with exacerbations or high rescue medication use (“Ex/R″). Direct health care costs and productivity loss costs attributable to workplace absence or short-term or long-term disability were measured during the 12-month post-index period. ResultsA total of 605,614 patients with asthma were identified. Annual health care costs were $4,384 greater for G4/5 asthma vs non-G4/5 patients with asthma; asthma-related costs contributed $2,183 of this difference (P < .001). Differences were primarily driven by G4/5 patients with asthma with Ex/R, whose costs were $5,019 greater than G4/5 patients without Ex/R (P < .001). For patients with 1 or more absences or short-term disability claims, G4/5 patients missed 7.2 more work hours for absence and had 3.9 more days of work lost for short-term disability than non-G4/5 patients with asthma, respectively (P < .05). ConclusionG4/5 patients with asthma incurred significantly greater direct and indirect costs than non-G4/5 patients with asthma. Differences were largely driven by those with Ex/R.
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