Conversely, decreases in risk (respectively, significant and close to significance) are associated with NO 2 and NO x concentrations (Table 3 ).
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Investigating the association between birth weight and complementary air pollution metrics: a cohort study.
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However when monitoring station measurements are considered, this yields a significant decrease in risk associated with PM 2.5 , while the initially marginally significant decrease in risk associated with NO x disappears [see Additional file 3 ].