Association between humidity and respiratory health: the 2016-2018 Korea National Health and Nutrition Examination Survey.

However, in the long term, higher RH showed a negative trend in relation to the risk of restrictive lung disease, with significant negative association observed at 4-year MA (OR: 0.978, 95% CI: 0.959–0.997, p = 0.022) (Fig. 3 B).

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PEF also showed consistent negative associations with RH in both the mid- and long-term, with β values ranging from -0.007 to -0.010 for mid-term and -0.012 to -0.018 for long-term, although negative correlations in short-term failed to reach statistical significance.

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