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Table 1 Demographics and health related variables

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

  Head injury population Controls
Variable
Total number of subjects 294 25,662
Age at participation in HUNT2 (years) (mean ± SD) 48.4 ± 14.7 47.3 ± 13.1
Age at injury (first injury) (years) (mean ± SD) 53.8 ± 15.2  
Age at participation in HUNT3 (years) (mean ± SD) 59.6 ± 14.7 58.5 ± 13.1
Time from head injury (first injury) to HUNT3 (years) (mean ± SD) 4.9 ± 3.2  
Female 137 (46.5) 14,639 (57.0)
Duration of education (HUNT2) (n (%))
≤ 9 years 82 (27.9) 7535 (29.4)
10–12 years 135 (45.9) 11,663 (45.4)
≥ 13 years 73 (24.8) 6007 (23.4)
HADS score (mean ± SD) (HUNT2) 8.8 ± 5.7 7.4 ± 5.4
HADS score (mean ± SD) (HUNT3) 8.5 ± 6.0 7.3 ± 5.4
BMI (mean ± SD) (HUNT2) 26.2 ± 3.9 26.0 ± 3.6
BMI (mean ± SD) (HUNT3) 27.4 ± 4.3 27.4 ± 4.3
Daily smoking (HUNT2) (n (%)) 62 (21.1) 6278 (24.5)
Daily and occasionally smoking (HUNT3) (n (%)) 73 (24.8) 5338 (20.8)
Self-reported health poor or less than good (HUNT2) (n (%)) 82 (27.9) 5451 (21.2)
Self-reported health poor or less than good (HUNT3) (n (%)) 102 (34.7) 6883 (26.8)
Headache sufferer (n (%))
 HUNT2 129 (43.9) 10,697 (41.7)
 HUNT3 111 (37.8) 8492 (33.1)
CAGEa ≥ 1 (HUNT2) (n (%)) 56 (19.0) 3721 (14.5)
CAGEa ≥ 1 (HUNT3) (n (%)) 58 (19.7) 3834 (14.9)
  1. Abbreviations: HADS Hospital Anxiety and Depression Scale, BMI Body Mass Index
  2. aCAGE Modified Norwegian version of the CAGE alcohol-screening instrument
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