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In the article “Weather and air pollution as triggers of severe headaches” by K. J. Mukamal et al. (Neurology® 2009;72;922–927), there was a typographical error in a confidence interval (CI) in the Results section of the abstract and in the Results section of the article. The risk associated with a 5° change in temperature was cited as 1.075; 95% CI, 1.021–1.033. The correct CI should be 1.021–1.133. The odds ratio, p value, and lower CI bound were all correct. The error does not affect the conclusions of the article. The authors apologize for the error.