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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