Fig. 3
From: The case for using digital EEG analysis in clinical sleep medicine
Odds-ratio-product (ORP) in different conventional sleep stages compiled from five different studies. Each dot is the average ORP in all epochs staged as a given stage in one patient. N1-N3, stages 1–3 of non-rapid-eye-movement (NR) sleep. #, significantly higher than in all other studies; Ω, significantly higher than studies 1–3. Study 1, from (Younes et al. 2015a). Study 2, from (Younes et al. 2015c). Study 3, internally acquired validation data in 79 patients with moderate/severe obstructive sleep apnea. Study 4, from (Younes). Study 5, from (Meza et al. 2016)