While no association between gender and grade was found, a significantly higher proportion of students in the town (17.6%) had medium or high headache levels than those in the city (6.1%), χ2 (4) = 10.08, p < 0.01.
Similar findings were observed for headaches occurring every day or almost every day in questionnaire ratings, in which 38.5% of the adolescents also reported the same levels in diary recordings, but 14.6% and 46.9% had low or medium levels of headache frequency, respectively.
These might actually be cases of migraine with a transiently high frequency or of a transient association of medium-frequency migraine and medium-frequency tension-type headache, as can often be seen in the natural history of migraine.
Association of pure migraine with low (OR=1.95, 95% CI=0.86-4.43, p=0.11) and medium physical activity, and coexistent headache and pure TTH with medium physical activity did not reach statistical significance.
A possible explanation could be that medium and high caffeine consumption change chronic headache into infrequent headache due to the analgesic properties of caffeine [2].
Of those who experienced headaches rated on the same 1-3 scaleity scase as in the questionnaire, 90.3% of the adolescents had low levels, while 8.3% and 1.4% of them experienced medium or high levels of headaches, respectively.
Those with mild to medium spasm (MFV M1 < 120cm/s) described headache as a dull lingering pain.
To improve the global care of headache, objectives for the short, medium and long term are suggested.
This implicated that the headache might not be derived from medium- or large-sized arteries constriction.
The intensity was scored on a Numerical Rating Scale (NRS) from 0 to 10, 1 representing a very mild headache (including feeling of pressing or pulsation), 5 a headache of medium severity and 10 the worst possible headache (10).
