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. Author manuscript; available in PMC: 2013 Sep 1.
Published in final edited form as: Epidemiology. 2012 Sep;23(5):689–698. doi: 10.1097/EDE.0b013e31825fb61d

Figure 1.

Figure 1

Semiparametric spline functions, with 2 degrees of freedom, illustrating the relation between maternal serum DDT and DDE concentrations and (A–B) Mental Development Index (MDI) and (C–D) Psychomotor Development Index (PDI) scores on the Bayley Scales of Infant Development (BSID) and (E–F) the Wechsler Intelligence Scale for Children (WISC), adjusted for the categorical variables of study center and maternal race and for the continuous variables of maternal age and education, in years (n≈1100).