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An L-Mode analysis of examining whether there is a categorical or continuous difference between those who have tension-type headache and those who have migraine headache by age groups. To isolate the effect of age, the entire sample was divided into those ≤ 24 years/old versus those > 24 years/old. Those individuals with Tension-Type Headache (TTH) are plotted in relation to those with Migraine (MIG).
