BKMR results showed that birth defects showed a trend of first slightly rising and then declining; when the element mixture was above the 50th percentile, it was significantly negatively associated with total birth defects.
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Multiple-element exposure in early pregnancy and birth defects: a nested case-control study based on the China birth cohort study.
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The sentences
Ni and Zn showed an obvious trend of slight increase and then rapid decrease, indicating that there was a dose–response relationship between these elements and birth defects.