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. 2006 Jul 6;114(10):1538–1541. doi: 10.1289/ehp.9123

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Relative risk of all cause mortality for different blood lead levels compared with referent level of 1.5 μg/dL (12.5th percentile). The solid line shows the fitted five-knot spline relationship; the dashed lines are the point-wise upper and lower 95% CIs.