Table 1.

International Classification of Headache Disorders (1988, 2004) diagnostic criteria for migraine and coding for the taxometric analyses.

Symptom		Coding in Analysis
A. At least 5 attacks1 fulfilling criteria B–D		Not used
B. Headache attacks lasting 4–72 hours (untreated or unsuccessfully treated)		Not used
C. Headache has at least two of the following characteristics:	1. unilateral location 2. aggravation by or causing avoidance of routine physical activity	0, 1a 0, 1a
	3. moderate or severe pain intensity	0 – 10
	4. pulsating quality	0, 1a
D. During headache at least one of the following:	1. nausea and/or vomiting	0 – 2b
	2. photophobia and phonophobia	0, 1 0, 1
E. Not attributed to another disorder		Not used
Other	aura symptoms present	0, 1 a

^a0 = no, 1 = yes

^b0 =none, 1 = one, 2 = both