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Table 2 Basic characteristics of the present headache sufferers based on the frequency of headache attacks

From: Diffusion tensor imaging in middle-aged headache sufferers in the general population: a cross-sectional population-based imaging study in the Nord-Trøndelag health study (HUNT-MRI)

Variables Frequency of headache attacks†
  Headache < 1 day/month Headache 1–6 days/month Headache 7–14 days/month Headache > 14 days/month
  n = 69 n = 135 n = 28 n = 13
Demographics
 Women (n [%] {missing})1 40 [58.0] {0} 84 [62.2] {0} 21 [75.0] {0} 7 [53.8] {0}
 Age (mean [SD] {missing})2 58.0 [4.6] {0} 58.4 [4.0] {0} 58.8 [3.6] {0} 61.2 [3.6] {0}
 Education > 12 years (n [%] {missing})3 20 [30.0] {0} 44 [32.6] {0} 9 [32.1] {0} 2 [15.4] {0}
Health-related
 BMI (mean [SD] {missing})4 26.3 [4.0] {1} 26.8 [4.0] {0} 27.2 [3.9] {0} 27.1 [3.8] {0}
 SBP (mean [SD] {missing}) 4 133.2 [17.0] {2} 131.4 [18.6] {2} 131.5 [18.6] {0} 135.1 [21.3] {0}
 DBP (mean [SD] {missing}) 4 78.1 [11.0] {2} 76.4 [11.5] {1} 74.5 [13.1] {0} 77.7 [15.5] {0}
 Non-fasting glucose (mean [SD] {missing}) 5.4 [0.9] {1} 5.4 [1.2] {4} 5.4 [0.8] {1} 5.9 [2.9] {1}
 Cholesterol (mean [SD] {missing}) 5.6 [0.9] {1} 5.9 [1.1] {4} 5.6 [0.9] {1} 5.7 [1.2] {1}
 Daily smoking (n [%] {missing})3 9 [13.0] {0} 26 [19.3] {0} 3 [10.7] {0} 0 [0] {0}
 HADS total score (mean [SD] {missing})4** 6.1 [4.7] {0} 8.1 [6.0] {1} 10.7 [7.0] {0} 10.0 [5.7] {0}
 Chronic pain last 6 months (n [%] {missing})3* 32 [46.4] {1} 73 [54.1] {1} 21 [75.0] {0} 10 [76.9] {1}
 Consuming alcohol ≥1/week (n [%] {missing})3 29 [42.0] {2} 63 [46.7] {2} 12 [42.9] {0} 3 [23.1] {0}
 Painkillers ≥1/week (n [%] {missing})3* 40 [58.0] {0} 95 [70.4] {4} 25 [89.3] {0} 9 [69.2] {0}
  1. *P < 0.05
  2. **P < 0.01
  3. †One headache sufferer lacked data on attack frequency
  4. 1 Chi-square test; 2 Analysis of Variance; 3 Binary logistic regression; 4 Analysis of Co-Variance
  5. n Number of individuals, SD Standard Deviation, SBP Systolic Blood Pressure, DBP Diastolic Blood Pressure, HADS Hospital Anxiety and Depression Scale
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