After full adjustment for potential confounders, no statistically significant nonlinear relationship was observed ( P for nonlinearity = .0879), although the overall association reached marginal significance ( P for overall association = .0238).
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Blood urea nitrogen and cardiovascular disease risk: Evidence from the CHARLS cohort study.
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The sentences
Although the associations did not reach conventional statistical significance, a marginally significant inverse trend was observed across increasing BUN quartiles ( P for trend = .081).
However, given that this negative linear relationship only demonstrated borderline statistical significance, the result should be interpreted as a suggestive trend rather than a definitive association.