Association of residential altitude with pure-tone hearing thresholds in plateau residents aged ≤50 years: a cross-sectional study.

The exploratory quadratic-term analysis for PTA at 8 kHz showed borderline significance for both the centered linear altitude term (β = 4.50, p = 0.059) and the quadratic term (β = −5.64, p = 0.061), suggesting that the relationship between residential altitude and PTA at 8 kHz may not be simply linear and may instead be non-monotonic ( Supplementary Figure S1 ; Supplementary Table S1 ).

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For example, the regression coefficient for PTA at 8 kHz was approximately 2.43 dB per 1,000 m, but this did not reach statistical significance ( Supplementary Table S1 ).

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