Abstract
OBJECTIVES: Major depressive disorder (MDD) is a common and serious disorder with significant impact on patients and families. The goal of this retrospective cohort study was to determine the economic burden among patients with MDD stratified by number of treatment lines needed for episode resolution. METHODS: Truven Health Analytics MarketScan(®) claims data were used to identify US patients (≥ 18 years) who were diagnosed with MDD and started on an antidepressant between 2013 and 2017. A generalized linear model estimated direct and employment-related costs for the first 12 months following initiation of treatment across cohorts with increasing number of lines of MDD pharmacotherapy. Analyses were adjusted for demographics and clinical factors. RESULTS: A total of 73,597 patients with MDD comprising the commercial (n = 66,459) and Medicare (n = 7138) populations met selection criteria. Patients who completed treatment for their episode with a single line of antidepressant had the lowest total adjusted direct costs (commercial $9975; Medicare $14,628) followed by those who completed with two lines (commercial $11,723; Medicare $15,526) and those treated with three or more lines of antidepressant regimens (commercial $21,259; Medicare $20,964). Patients who completed treatment with two lines as opposed to one incurred significantly higher direct costs (commercial +$1748, p < 0.0001; Medicare +$898, p = 0.0092). Patients who completed treatment with one line had the lowest employment-related costs compared to other groups. CONCLUSIONS: There was an increased economic burden associated with delay of episode resolution as early as the second line compared to the first line in MDD.