J Rhinol.  2018 May;25(1):32-37. 10.18787/jr.2018.25.1.32.

Accuracy Analysis of Embletta X100 for the Diagnosis of Obstructive Sleep Apnea and the Assessment of Sleep Structure

  • 1Department of Otorhinolaryngology, Ajou University School of Medicine, Suwon, Korea.
  • 2Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Konkuk University, Seoul, Korea.
  • 3Department of Office of Biostatistics, Institute of Medical Sciences, Ajou University School of Medicine, Suwon, Korea.
  • 4Department of Cardiology, Ajou University School of Medicine, Suwon, Korea. bjchoi@ajou.ac.kr


To measure the accuracy of Embletta X100, a level 2 portable sleep monitoring device, for diagnosis of obstructive sleep apnea and assessment of sleep structure. MATERIALS AND METHOD: We enrolled 200 consecutive patients who had been referred due to habitual snoring or witnessed apnea during sleep and had undergone standard polysomnography (PSG). We created a simulated situation similar to that of the Embletta X100 using only data from PSG and scored the sleep stage and the apnea-hypopnea index (AHI). Thereafter, the results of PSG and simulated Embletta X100 were compared.
Sensitivity, specificity, and positive and negative predictive values of simulated Embletta X100 based on PSG were nearly 100% at three different cutoff values of AHI (5, 15, and 30). Intraclass correlation (ICC) of simulated Embletta X100 based on PSG was also excellent (≥0.9) for most of the sleep-related parameters and respiratory index. However, ICC of sleep stage percent was variable according to sleep stage (>0.9 for N1 and N2, 0.664 for N3, and 0.864 for R).
Although sleep staging is not very precise, Embletta X100 matches well with PSG overall.


Obstructive sleep apnea; Portable sleep monitoring; Embletta X100
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