1. Employees affected by migraine miss more work.

This assumption has been substantiated in several large, well-designed studies. Estimates vary based on how the population studied was identified. We have used a conservative estimate of 8 workdays missed per year due to migraine, which includes both absenteeism and presenteeism. For a more detailed description, please see Estimating the number of days lost.

2. It costs companies money when workers miss work due to migraine

Given that assumption #1 is true, we assume that companies spend additional money with hiring and training additional workers to cover lost time due to absenteeism/presenteeism. Absenteeism and presenteeism may affect a company in other negative ways that could result in lost revenue, including the effects on employee morale.

3. Lost workday equivalents can be reduced when migraines are treated with triptans.

Clinical studies have supported this assumption. Although the overall estimates vary for each individual study, they consistently show a positive effect across a variety of studies. The Productivity Impact Model uses a default value of 49% reduction in absenteeism/presenteeism.

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