Fig 2 -

Electroencephalography power spectra (A) and ratio and mean power frequency of electroencephalography (B) at different electrodes, and the relationship between two groups of subjects with and without AMS from the ground to 2,400 m and 3,400 m. The results are presented as estimated marginal mean ± standard error (SE). *p EEG, mean power frequency of electroencephalography; Ratio, electroencephalography power spectrum radio (α+β) / (θ+δ).