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. 2021 Sep 27;175(12):1–9. doi: 10.1001/jamapediatrics.2021.3518

Figure 2. Distribution of Blood Lead Levels Based on Risk Factor Quintiles Assessed by Zip Code.

Figure 2.

A, Pre-1950s housing quintile; 6778 missing estimates. B, Poverty quintile; 6901 missing estimates. C, Predominant race and ethnicity. “Predominant” refers to zip codes with estimated proportions of the given race and ethnicity over 50%. To convert blood lead levels to micromoles per liter, multiply by 0.0483. Cochran-Armitage test for trend, P < .001 for progressive quintiles of pre-1950s housing construction (A) and poverty (B) within each blood lead measurement level.