Fig. 1From: Countervailing effects of income, air pollution, smoking, and obesity on aging and life expectancy: population-based study of U.S. CountiesNon-linear relationships between longevity measures and median income. Panels a and b present the relationship between exceptional aging and median income for the unadjusted and fully adjusted models, respectively. Panels c and d present the relationship between life expectancy and median income for the unadjusted and fully adjusted models, respectively. Spline smooth functions allowed for up to four degrees of freedom. Unadjusted models exclude controls for smoking and obesity, while full models include these controlsBack to article page