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(A) Correlation with apnea-hypopnea index. (B) Correlation with obstructive apnea-hypopnea index. (C) Correlation with oxygen desaturation index. (D) Correlation with percent total sleep time with oxygen saturation less than 90%. AHI = apnea-hypopnea index, OAHI = obstructive apnea-hypopnea index, ODI = oxygen desaturation index, TST = total sleep time.
