From: Association between blood pressure measures and recurrent headache in adolescents: cross-sectional data from the HUNT-Youth study
<1 day per month (%)
1–3 days per month (%)
1–5 days per week (%)
>5 days per week (%)
Boys n = 2,801
147 (5.2)
279 (10.0)
112 (4.0)
5 (0.2)
Girls n = 3,031
174 (5.7)
542 (17.9)
329 (10.9)
24 (0.8)