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Histogram of the HIT-6 total scores in the study population. Box-and-whiskers plot shows median and IQR, and whiskers indicate 5th and 95th percentiles. Dotted lines show the HIT-6 categories (headache impact): little or no impact (score <50), some impact (50–55), substantial impact (56–59) and severe impact (≥60).
Abbreviation: HIT-6, headache impact test-6.
