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Quartile boxplot of root mean square error of a) respiratory rate and b) pulse for or non-apneic (AHI < 5), mild (5 ≤ AHI < 15), moderate (15 ≤ AHI < 30), and severe (AHI ≥ 30) sleep apnea subjects during awake, sleep with normal breathing, or sleep with apneas or hypopneas.
