Measures of overnight oxygen saturation to characterize sleep apnea severity and predict postoperative respiratory depression

Table 1 Extracted SpO₂ measures

Name	Descriptions
SpO₂ ENT	Entropy of overnight SpO₂ signal
SpO₂ STD	Standard deviation of overnight SpO₂ signal
BAB	Area under the overnight average of SpO₂ divided by total sleep time in seconds (below average burden)
ODB AVG	Average of normalized overnight desaturation burdens^* of desaturation episodes
ODB STD	Standard deviation of normalized overnight desaturation burdens^* of desaturation episodes
ODB ENT	Entropy of normalized overnight desaturation burdens^* of desaturation episodes
NDB	Cumulative overnight desaturation burdens^* divided by the total sleep time in seconds (nocturnal desaturation burden)

^*Desaturation burden: area under the curve of desaturation episodes with respect to the maximum SpO₂ level within 100 s before SpO₂ starts rising again

ISSN: 1475-925X