A Pilot Study of Detecting Individual Sleep Apnea Events Using Noncontact Radar Technology, Pulse Oximetry, and Machine Learning

Figure 4

Bland-Altman plots of agreement between Somnofy+SpO₂ and HSAT on different sleep apnea indexes. The disagreement between Somnofy+SpO₂ and HSAT on the -axis is plotted against the average of Somnofy+SpO₂ and HSAT on the -axis for different sleep apnea indexes. The blue dots represent values for individual nights, the solid grey line represents the bias, the dotted lines represent the Bland-Altman 95% limits of agreement, and the orange line represents a linear regression to visualize any trend. REI: respiratory event index (number of hypopneas and apneas per hour of recording); HI/OAI/CAI/MAI: hypopnea/obstructive apnea/central apnea/mixed apnea index (number of hypopneas/obstructive apneas/central apneas/mixed apneas per hour of recording).