Fig. 1
Sex-differences of sleep apnea and SpO2 measures in patients with and without postoperative respiratory depression. a apnea–hypopnea index (AHI), b total arousal index, c respiratory-related arousal index, d standard deviation of overnight SpO2 signal (SpO2 STD), e entropy of overnight SpO2 signal (SpO2 ENT), f below average burden (BAB), g average of normalized desaturation burdens of overnight desaturation episodes with ≥ 3% drops (ODB AVG), h standard deviation of normalized desaturation burdens of overnight desaturation episodes with ≥ 3% drops (ODB STD), i entropy of normalized desaturation burdens of overnight desaturation episodes with ≥ 3% drops (ODB ENT), j Overall nocturnal desaturation burden (NDB). RD: respiratory depression. Values show p-values