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Table 3 Change in monthly headache frequency between HUNT2 and HUNT3 among participants suffering from headache in both surveys

From: Headache following head injury: a population-based longitudinal cohort study (HUNT)

   N (%), head injury population N (%), controls
HUNT2 HUNT3
Decreased headache frequencya 10 (12.5) 939 (15.1)
> 14 days 1–14 days 2 (2.5) 269 (4.3)
7–14 days <  7 days 8 (10.0) 670 (10.8)
Stable headache frequencyb 55 (68.8) 4234 (68.0)
<  7 days <  7 days 46 (57.5) 3833 (61.6)
7–14 days 7–14 days 4 (5.0) 257 (4.1)
>  14 days >  14 days 5 (6.3) 144 (2.3)
Increased headache frequencyc 12 (15.0) 757 (12.2)
<  7 days 7–30 days 10 (12.5) 633 (10.2)
7–14 days >  14 days 2 (2.5) 124 (2.0)
Missing 3 (3.8) 293 (4.7)
Total 80 (100.0) 6223 (100.0)
  1. aLess frequent headache (days/month) in HUNT3 compared to HUNT2
  2. bSame headache frequency (days/month) in HUNT3 as in HUNT2
  3. cMore frequent headache (days/month) in HUNT3 compared to HUNT2
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