Figure 1

Sex and race differences in Zp according to age. A, Unadjusted results comparing whites (open circles) and blacks (filled circles). B, Unadjusted results comparing males (open circles) and females (filled circles). C, Race differences in the predicated values for Zp relative to age based on the model in Table 2​2,, comparing whites (open circles) and blacks (closed circles). D, Sex differences in the predicated values for Zp relative to age based on the model in Table 2​2,, comparing males (open circles) and females (closed circles). All 655 participants are included in each panel.