Table 2 Different sets of criteria for the diagnosis of migraine based on information in the questionnaire

I. Restrictive migraine criteria (definite migraine)

 B. Headache attacks lasting ≤72 h^a

 C. Headache had usually at least two of the following three characteristics:

  1. Pulsating quality

  2. Unilateral location

  3. Moderate or severe pain intensity

  4. Aggravation by physical activity

 D. During headache, at least one of the following:

  1. Nausea and/or vomiting

  2. Increased sensitivity to light and sound

II. Migraine with aura

 Restrictive migraine criteria, and visual^b disturbance prior to or during headache

III. Liberal migraine criteria (definite and probable migraine)

 Self-reported migraine, or fulfilled the restrictive criteria

IV. Liberal HUNT 2 migraine criteria (definite and probable migraine)

 Self-reported migraine, or fulfilled the criterion B, D, and modified criterion C (headache had usually at least one of the following three characteristics: pulsating quality, unilateral location, or aggravation by physical activity)