R S < 0 indicates a decreasing trend, and vice versa; when R S is greater than the critical value W P in the rank correlation coefficient table, it indicates that the trend of change is statistically significant.
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Exploring the effects of altered concentrations of PM<sub>2.5</sub> and its constituents on the incidence risk of type 2 diabetes mellitus and glucose and lipid indicators: a cohort study in Northwestern China.
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