Table 3.

Pearson and Spearman correlation coefficients for responses to Migraine Disability Assessment (MIDAS) questions and the overall score among participants in the US (n = 97) and UK (n = 100) test-retest reliability studies, 1997–1998

QuestionUnited StatesUnited Kingdom
Pearson correlationSpearman correlationPearson correlationSpearman correlation
* p Values for all correlations are <0.001.
On how many days in the last 3 months did you miss work or school because of your headaches?0.68*0.690.660.56
How many days in the last 3 months was your productivity at work or school reduced by half or more because of your headaches?0.540.650.710.65
On how many days in the last 3 months did you not do household work because of your headaches?0.600.630.820.58
How many days in the last 3 months was your productivity in household work reduced by half or more because of your headaches?0.640.590.600.56
On how many days in the last 3 months did you miss family, social, or nonwork activities because of your headaches?0.620.710.520.46
Total MIDAS score0.800.780.830.77