Prenatal Ambient Air Pollutant Mixture Exposure and Early School-age Lung Function.

In the multivariable-adjusted linear regression model that used the BKMR-DLM weighted exposure levels ( Figure 4 A ), increased NH 4 + was associated with decreased FEV 1 in the overall sample (β = −0.82; P = 0.003; per SD increase in NH 4 + ) and among boys (β = −0.97; P = 0.02); the association was in a similar direction in girls although this did not reach statistical significance (β = −0.65; P = 0.14).

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