Mediation of depressive symptoms in the association between blood urea nitrogen to creatinine ratio and cognition among middle-aged and elderly adults: evidence from a national longitudinal cohort study.

In contrast, the average depressive symptoms scores for the four groups were 9.13 ± 5.11, 9.73 ± 5.14, 9.84 ± 5.53, and 10.37 ± 5.66, showing an increasing trend from Q1 to Q4.

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The average cognitive scores for the four groups were 17.34 ± 5.53, 17.15 ± 5.42, 16.87 ± 5.65, and 16.13 ± 5.69, indicating a decreasing trend from Q1 to Q4.

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