Figure 1.

Demographics of respondents by gender and frequency of attacks. Of the 70 respondents, 55 (78.6%) respondents were female, and 15 (21.4%) were male. Those patients reporting on average 20 or more attacks were categorized as a high frequency group (n =19/70, 27.1%), those reporting 1-19 attacks were described as a low frequency group (n = 29/70, 41.4%), patients reporting a history of attacks, but none over the previous year were categorized as a no attack group (n = 7/70, 10.0%), and those reporting no attack onset were classified as an asymptomatic group (n = 7/70, 10.0%). An "unclassified" group was created to label those who did not indicate the number of attacks on average that they experience in a year (n = 8/70, 11.4%). Women made up 94.7% of those in the high attack group (n = 18/19). Male respondents were slightly over-represented in the low and asymptomatic groups, and more substantially over-represented in the no attack group (n = 7/29, 24.1%; n = 2/7, 28.6%; n = 3/7, 42.9%, respectively).