reference), although a significant trend remained.
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The sentences
There was also a nonsignificant intermediate increase in the hazard (29%) in the category with mild ID (50–99 μg/L) and a highly significant dose–response relation across the categories with normal (100–300 μg/L), mild (50–99 μg/L), and moderate-severe (<50 μg/L) ID ( p for trend 0.004).