• Colette Andrée, Timothy J Steiner, Jessica Barré, Zaza Katsarava, Jose Miguel Lainez, Christian Lampl, Michel Lantéri-Minet, Daiva Rastenyte, Ruiz de la TorreElenaE, Cristina Tassorelli, and Lars Jacob Stovner.
• Department of Neuroscience, Norwegian University of Science and Technology, Trondheim, Norway. t.steiner@imperial.ac.uk.
• J Headache Pain. 2014 May 28; 15 (1): 3333.

BackgroundSurveys enquiring about burden of headache over a prior period of time (e.g., 3 months) are subject to recall bias. To eliminate this as far as possible, we focused on presence and impact of headache on the preceding day ("headache yesterday").MethodsAdults (18-65 years) were surveyed from the general populations of Germany, Italy, Lithuania, Luxembourg and the Netherlands, from a work-force population in Spain and from mostly non-headache patient populations of Austria, France and U.K. A study of non-responders in some countries allowed detection of potential participation bias where initial participation rates were low.ResultsParticipation rates varied between 11% and 59% (mean 27%). Non-responder studies suggested that, because of participation bias, headache prevalence might be overestimated in initial responders by up to 2% (absolute). Across all countries, 1,422 of 8,271 participants (15-17%, depending on correction for participation bias) had headache yesterday lasting on average for 6 hours. It was bad or very bad in 56% of cases and caused absence from work or school in 6%. Among those who worked despite headache, 20% reported productivity reduced by >50%. Social activities were lost by 24%. Women (21%) were more likely than men (12%) to have headache yesterday, but impact was similar in the two genders.ConclusionsWith recall biases avoided, our findings indicate that headache costs at least 0.7% of working capacity in Europe. This calculation takes into account that most of those who missed work could make up for this later, which, however, means that leisure and social activities are even more influenced by headache.

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