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Table 4 Odds ratio (OR) with 95% CI for ESS ≥ 10 and KSQ ≥ 75 percentile related headache frequency

From: Associations between sleep disturbance and primary headaches: the third Nord-Trøndelag Health Study

Questionnaire P OR 95% CI
Lower Higher
ESS ≥ 10
 All headache groups     
  No headache (n = 76)   1.0 Ref  
  <7 headache days/month (n = 178) 0.2 1.8 0.7 4.5
  7–14 headache days/month (n = 19) 0.09 3.6 0.8 15.2
  >14 headache days/month (n = 22) 0.3 2.1 0.5 9.3
  P for trend 0.4    
KSQ ≥ 75 percentile
 All headache groups
  No headache (n = 76)   1.0 Ref  
  <7 headache days/month (n = 179) 0.02 2.7 1.2 5.9
  7–14 headache days/month (n = 19) 0.006 5.6 1.6 19.2
  >14 headache days/month (n = 22) <0.001 17.4 5.1 59.8
  P for trend <0.001    
TTH
 No headache (n = 76)   1.00 Ref  
 <7 headache days/month (n = 115) 0.01 2.9 1.3 6.8
 7–14 (headache days/month (n = 9) 0.3 2.8 0.5 17.0
 >14 headache days/month (n = 11) <0.001 18.3 3.6 93.0
 P for trend <0.001    
Migraine
 No headache (n = 76)   1.00 Ref  
 <7 headache days/month (n = 38) 0.06 3.4 0.9 12.0
 7–14 headache days/month (n = 9) 0.002 18.6 2.8 121.6
 >14 headache days/month (n = 4) 0.004 38.9 3.1 485.3
 P for trend <0.001    
  1. Multivariate logistic regression adjusted for age, sex, and sleep-promoting medication
  2. Mean KSQ score with 95% CI in headache-free individuals, subjects with tension-type headache, migraine, MOH, and “other headaches” (probable TTH (n = 8), probable migraine (n = 5), hangover-headache (n = 6), headache attributed to systemic viral infection (n = 4), rhinosinusitis (n = 2), cerviogenic headache (n = 1), caffeine-withdrawal headache (n = 1), persistent idiopathic facial pain (n = 1), and primary exertional headache (n = 1)