Increasing income inequality has had many effects on Californians' lives, including on life expectancy, which can be taken as a proxy for health or even general welfare. A study conducted by Clarke et al. related life expectancy to socioeconomic status (SES, an index including income and other related factors), finding that Californians in the top 20% by SES live on average six years longer than those in the bottom 20% (81 years, compared to 75). This disparity becomes even more pronounced when intersected with race: White males in the top 20% live 14 years longer than African American males in the bottom 20% (for females, the difference is 10 years).