Figure 2.

Changes in the prevalence of insomnia symptoms (Athens Insomnia Scale¹³ items) among insomniacs and non-insomniacs after arrival at high altitude.

Notes: (A) Difficulty in sleep induction; (B) arousal during the night; (C) awakening in the early morning; (D) shortened total sleep duration; (E) decreased total sleep quality; (F) decreased sense of well-being in the daytime; (G) decreased functioning in the daytime; (H) daytime sleepiness. Compared to the values obtained at 500 m in the same group: *P<0.05, **P<0.01, ***P<0.001.