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Table 6 Odds of being in a higher category of monthly headache frequency, categorized as < 1 day, 1-7 days, 8-14 days, >14 days, among patients with suspected OSA and headache

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

  n Odds ratio 95% confidence interval p
Normal (AHI <5) 192 1   
Mild OSA (AHI 5-14) 104 1.01 (0.65-1.58) 0.96
Moderate OSA (AHI 15-29) 53 0.86 (0.46-1.61) 0.63
Severe OSA (AHI ≥ 30) 46 1.19 (0.63-2.23) 0.59
  1. OSA = obstructive sleep apnea.
  2. Multivariate ordered logistic regression analysis, adjusted for age, sex, and education (N = 395).