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Associations between loop gain and apnea–hypopnea index. (A) A significant positive association (r2 = 0.43, p < 0.001) is found between average NREM loop gain values and the NREM apnea–hypopnea index (AHINREM). (B) A similar, although weaker association (r2 = 0.33, p < 0.001) is found between REM sleep loop gain values and the REM apnea–hypopnea index (AHIREM).
