Fig. 3From: Spatial variability of the effect of air pollution on term birth weight: evaluating influential factors using Bayesian hierarchical modelsNon-linear influence of the tract-level factors on effects of air pollutants on term birth weight. The gray dash lines indicate the approximate intervals of thresholds where the influential factors start to take pronouncedly attenuating (a, c and d) or aggravating (b, e, f) influence on effects of air pollutants. The shades around the curve indicate the 95Â % pointwise confidence limits of the estimate acquired by the hierarchical modelsBack to article page