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Table 3 Odds of experiencing headache during the past year in patients referred to a sleep study compared to general population controls

From: Prevalence and predictors of headache in patients referred to polysomnography

  n Odds ratio 95% confidence interval p
Population
  General population controls 287 1   
  Patients: normal sleep study 222 3.56 (2.20-5.76) <0.001
  Patients: obstructive sleep apnea 253 3.51 (2.29-5.38) <0.001
  Patients: sleep study without assessment of AHI 300 3.33 (2.14-5.20) <0.001
Age, increase of 1 year 1062 0.96 (0.95-0.97) <0.001
Gender
  Male 652 1   
  Female 410 2.72 (1.87-3.97) <0.001
Education
  0-9 years 474 1   
  10-12 years 184 1.06 (0.64-1.74) 0.825
  >12 years 404 0.69 (0.49-0.98) 0.040
  1. Multivariate logistic regression analysis, N = 1062.