TABLE 1.

Attributes and levels

Attribute	Attribute description seen by participants	Participant group	Levels
			Choice frame 1		Choice frame 2
			Treatment A	Treatment B	Treatment A	Treatment B
When does the preventative treatment begin working?	Treatments to prevent migraine may differ in when they begin working. While the preventative treatments you have taken may not have worked on day 1, some newer preventative treatments may begin to work on the first day of treatment. This is measured as the number of people out of 100 on the treatment who experience a migraine on the first day after receiving preventive treatment	Episodic migraine	Fixed 22%	Varied 0–22%	Fixed 14%	Fixed 22%
		Chronic migraine	Fixed 42%	Varied 10–42%	Fixed 28%	Fixed 42%
Number of migraine days during the first month of treatment	Once preventive treatments start working, they may differ in how effective they are at preventing migraines. This is measured using the number of days per month that people on the preventive treatment experience a migraine. During this survey, please assume that the severity of migraines does not change. In the calendar below, the number of days represent the days with a migraine in the first month of treatment	Episodic migraine	Fixed 5 days	Fixed 6 days	Fixed 6 days	Varied 0–6 days
		Chronic migraine	Fixed 10 days	Fixed 12 days	Fixed 12 days	Varied 0–12 days