The Sleep Quality of Han Chinese and Tibetan Firefighters at High Altitude: A Field Study.

Correlation analysis suggested a positive trend between PSQI scores and altitude ( p = 0.072).

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Although there was no statistically significant difference in PSQI scores among Han Chinese firefighters across different altitude, the prevalence of poor sleep quality showed a trend toward statistical significance between 500 m and 4509 m (23% vs 44%, p = 0.08).

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Additionally, the GAD-7 scores of the Han Chinese at 4509 m were considerably higher than those of the Tibetan population at 2570 m; the difference did not reach statistical significance when comparing the Han Chinese population at 4509 m to the Tibetan population at 4509 m (see Table 2 ).

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Sleep Quality As illustrated in Table 2 , the global PSQI score exhibited an increasing trend among the Han Chinese groups at elevations of 500 m, 2570 m, and 4509 m.

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