Table 2.

Mean and median responses to Migraine Disability Assessment (MIDAS) questions from participants in the UK and US test-retest reliability studies overall and among participants reporting at least six migraine headaches per year, 1997–1998

QuestionAll individuals≥6 migraine headaches per year
US (n = 97)UK (n = 100)p Value*US (n = 79)UK (n = 42)p Value*
MeanMedianMeanMedianMeanMedianMeanMedian
* p Value for Mann-Whitney U test21 of difference in means between the United States and United Kingdom.
On how many days in the last 3 months did you miss work or school because of your headaches?1.600.800.091.701.000.12
How many days in the last 3 months was your productivity at work or school reduced by half or more because of your headaches?4.923.920.025.344.230.63
On how many days in the last 3 months did you not do household work because of your headaches?5.333.330.015.643.830.06
How many days in the last 3 months was your productivity in household work reduced by half or more because of your headaches?4.733.820.325.034.230.66
On how many days in the last 3 months did you miss family, social, or nonwork activities because of your headaches?3.021.810.023.222.110.17
Total MIDAS score19.51412.890.0120.71515.2110.12