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Comparison of previous (1996–2007) blood lead (PbB) levels (A) and zinc protoporphyrin/heme (ZPP) ratios (B) with current (2012) PbB and ZPP/heme levels in matched (same) individual Andean Ecuadorian adults living in Pb-glazing communities. For PbB comparisons (A), 19 matched cases are presented, and for the ZPP/heme comparisons (B) 8 matched individual participants are presented.
