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Table 4 Odds of being in a higher category of monthly headache frequency, categorized as < 1 day, 1-7 days, 8-14 days, >14 days, among those reporting headache

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

  n Odds ratio 95% confidence interval p
Population
  General population controls 183 1   
  Patients: normal sleep study 191 3.42 (2.33-5.04) <0.001
  Patients: obstructive sleep apnea 201 3.29 (2.21-4.88) <0.001
  Patients: sleep study without assessment of AHI 254 3.00 (2.09-4.31) <0.001
Age, increase of 1 year 829 1.00 (0.99-1.01) 0.65
Gender
  Male 474 1   
  Female 355 1.59 (1.22-2.07) 0.001
Education
  0-9 years 373 1   
  10-12 years 153 0.60 (0.42-0.85) 0.005
  >12 years 303 0.62 (0.47-0.83) 0.001
  1. Multivariate ordered logistic regression analysis, N = 829*.
  2. *Fewer patients compared to Table 3 due to omission of answers to headache frequency questions.