Address locations (a) have been jittered to protect participant confidentiality; median household income (b), proportion of individuals below the federal poverty line (c), proportion of homes that were owner-occupied (d), proportion of adults who graduated from high school (e) and proportion of adults who graduated from college (f) are shown for census block groups, with darker shades indicate census block groups with higher socioeconomic status (higher median household income, less poverty, more home ownership, higher educational attainment), approximately equal area for each of 10 shades