Fig. 2
From: The prevalence of obstructive sleep apnea in mild cognitive impairment: a systematic review
Reported OSA prevalence (%) in patients with MCI and Controls. Abbreviations: CL = clinic; COM = community; HNR = Heinz Nixdorf Recall; MCI = mild cognitive impairment; PSG = polysomnography. aIncludes patients recruited from neurology clinics. bIncludes patients recruited from a public health center. cIncludes patients recruited from HNR cohort (community-based sample). dIncludes patients recruited from multiple clinics, including neurology clinics, OSA risk in MCI vs. Controls [OR 3.61 (2.09–6.22), p <  0.0001]