Figure 6: Headache days and headache pain intensity from diary (). (a) Number of headache days per month. (b) Average headache intensity (on headache days). Circle indicates the mean and the bar indicates the 95% CI. Circles are individual subject scores. A significant decrease in headache days per month was noticed at four weeks, almost doubling at eight weeks. Four subjects (#4, 5, 7, and 8) exhibited a greater than 20% decrease in headache intensity. Concurrent medication use may explain the small decrease in headache intensity.