Fig. 3
From: Anesthesia depth monitoring during opioid free anesthesia – a prospective observational study
Secondary quantitative outcome. Bar chart illustrating difference in mean spectral edge frequency (SEF) between total intravenous anesthesia (TIVA), volatile and opioid-free anesthesia (OFA) groups. The whiskers represent the 95% confidence interval. A single asterisk (*) indicates a statistically significant difference between groups