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Scatterplots of respiratory cycle-related electroencephalographic changes (RCREC) between baseline and follow-up polysomnography within the control group in (A) overall EEG, and (B) delta, (C) theta, (D) alpha, (E) sigma, and (F) beta frequency bands. The intraclass correlation coefficients of each band within each sleep stage are shown. REM, rapid eye movement sleep; SWS, slow wave sleep.
