Figure 2. Association between Tanner Stage and Blood Lead Concentrations.

The two left-most panels show the Tanner stages of all girls. The other panels show the model-based estimates of the delay in each stage, calculated with use of the results of ordinal logistic regression of Tanner stages, and on solving the equation, with the use of age-specific means for other risk factors and confounders. To convert values for lead to micromoles per liter, multiply by 0.048.