QG-C analysis of the correlation between various metal elements and olfactory dysfunction In the QG-C model, the occurrence rate of olfactory dysfunction is positively correlated with the metal mixture ( Figure 4A ) and has a weak negative correlation with blood OMP protein levels, it can be considered that as the concentration of the metal mixture increases, the occurrence rate of olfactory dysfunction increases, and the plasma OMP levels show a decreasing trend ( Figure 4C ).
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Association between urinary mixture metal levels and olfactory function in coal miners.
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Pb showed an inverted U-shaped correlation with olfactory function, with a positive trend, and the posterior inclusion probability of urinary Pb was the highest (PIP value was 1 in Table 3 ), indicating its significant role in the correlation between urinary metals and olfactory function.
However, there was only a weak trend in the association between mixed metal exposure and blood OMP, which was not statistically significant ( Figure 2B ).