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Reduced FW fraction in mild OSA. (a) For each subject, the average FW fraction was extracted with a value ranging from 0 (restricted water) to 1 (water that diffuses freely). (b) The average‐fitted FW fraction value for each subject is presented by groups. The mild OSA group showed significantly lower FW fraction compared with controls at p < .05, adjusted for BMI and CSF volume. BMI, body mass index; CSF, cerebrospinal fluid; FW, free‐water; OSA, obstructive sleep apnea
