Fig. 2

Monthly use of prescribed acute and OTC drugs. (a) Overall respondents with migraine and (b) Respondents who consulted doctors for migraine in the past year. The stacked bar chart corresponds to the left Y-axis and the black line graph corresponds to the right Y-axis. In the survey, respondents answered ‘number of days of drug use’ separately for each individual drug. The counts were summed up to obtain the total reported here for each of the summed number of days of any prescribed acute drug use and summed number of days of any OTC drug use. We reported this in the table, as well as in the stacked bar chart. The respondents also separately answered the number of days of any acute drug use (including both OTC and prescribed drugs); this is only shown in the table below the graph. The sum of number of days of ‘OTC drug use’ and number of days of ‘any prescribed acute drug use’ is not equal to ‘any acute drug use’, because multiple drugs may have been used in combination on the same day. Abbreviations: CM – Chronic Migraine, MHD – Monthly Headache Days, N – Total population size, n – Sample size, NSAID – Non-steroidal Anti-inflammatory Drug, OTC – Over-the-counter, SD – Standard Deviation