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Table 2 Headache frequency in patients with suspected obstructive sleep apnea (N = 477), percent

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

   Obstructive sleep apnea
Normal Mild Moderate Severe
AHI <5 5-14 15-29 ≥30
n 225 124 67 61
  % (95% CI) % (95% CI) % (95% CI) % (95% CI)
No headache 13 (9-18) 17 (11-25) 19 (12-30) 23 (14-35)
Infrequent headache
  <1 day per month 20 (16-26) 18 (12-25) 31 (22-43) 20 (12-31)
Frequent headache
  1-7 days per month 36 (30-42) 41 (33-50) 24 (15-35) 26 (17-38)
  8-14 days per month 12 (8-16) 11 (6-17) 9 (4-18) 10 (5-20)
Chronic headache
  >14 days per month 19 (15-25) 14 (9-21) 16 (9-27) 21 (13-33)
  1. CI denotes confidence intervals.