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. 2011 Nov 7;120(2):204–209. doi: 10.1289/ehp.1104020

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Distribution of age-adjusted urine cadmium in NHANES 1988–1994, 1999–2002, and 2003–2008. Urine cadmium concentrations were adjusted for age (years modeled as restricted cubic spline with 5 knots) in survey-period–specific strata.