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Objectives. To estimate the effect of Medicaid expansion on noncitizens' and citizens' participation in the Supplemental Security Income (SSI) program. The Affordable Care Act (ACA) expanded Medicaid eligibility to cover low-income nonelderly adults without children, thus delinking their Medicaid participation from participation in the SSI program. Methods. Using data from the Social Security Administration for 2009 through 2018 (n = 1020 state-year observations) and the Current Population Survey for 2009 through 2019 (n = 78 776 respondents), we employed a difference-in-differences approach comparing SSI participation rates in US states that adopted Medicaid expansion with participation rates in nonexpansion states before and after ACA implementation. Results. Medicaid expansion reduced the SSI (disability) participation of nonelderly noncitizens by 12% and of nonelderly citizens by 2%. Estimates remained robust with administrative and survey data. Conclusions. Medicaid expansion caused a substantially larger decline in the SSI participation of noncitizens, who face more restrictive SSI eligibility criteria, than of citizens. Our estimates suggest an annual savings of $619 million in the federal SSI cost because of the decline in SSI participation among noncitizens and citizens. [ABSTRACT FROM AUTHOR]

Objectives. We examined the effects of market income inequality (income inequality before taxes and transfers) and income redistribution via taxes and transfers on inequality in longevity. Methods. We used life tables to compute Gini coefficients of longevity inequality for all individuals and for individuals who survived to at least 10 years of age. We regressed longevity inequality on market income inequality and income redistribution, and we controlled for potential confounders, in a cross-sectional time-series sample of up to 28 predominantly Western developed countries and up to 37 years (1974-2011). Results. Income inequality before taxes and transfers was positively associated with inequality in the number of years lived; income redistribution (the difference between market income inequality and income inequality after taxes and transfers were accounted for) was negatively associated with longevity inequality. Conclusions. To the extent that our estimated effects derived from observational data are causal, governments can reduce longevity inequality not only via public health policies, but also via their influence on market income inequality and the redistribution of incomes from the relatively rich to the relatively poor. [ABSTRACT FROM AUTHOR]

Objectives. To determine the prevalence trends of osteoarthritis (OA), rheumatoid arthritis (RA), and other types of arthritis in the United States from 1999 to 2014. Methods. We analyzed data on 43 706 community-dwelling adults aged 20 years and older who participated in the 1999–2014 National Health and Nutrition Examination Surveys. We accounted for survey design and sampling weights so that estimates were nationally representative. We assessed temporal trends in age-standardized arthritis prevalence by using joinpoint regression. Results. Age-adjusted prevalence of arthritis was 24.7% (OA = 9.7%; RA = 4.2%; other arthritis = 2.8%; “don’t know” type = 8.0%). Prevalence of OA increased from 6.6% to 14.3%, whereas RA prevalence decreased from 5.9% to 3.8%. Increase in OA prevalence was significant in both genders; in non-Hispanic Whites, non-Hispanic Blacks, and Hispanics; and in people with high socioeconomic status. Decrease in RA prevalence was more pronounced in men, non-Hispanic Blacks, and participants with low income or obesity. Conclusions. Between 1999 and 2014, nearly one quarter of American adults reported arthritis. The prevalence of OA has more than doubled over time, whereas RA prevalence has declined. [ABSTRACT FROM AUTHOR]

Objectives. To determine enrollment rates and predictors of enrollment for newly eligible low-income adults in California following the Affordable Care Act's (ACA's) Medicaid expansion. Methods. We used data from the 2014 to 2015 California Health Interview Survey to examine post-ACA Medicaid enrollment rates and multivariable logistic regression to assess the association of demographic factors, income, and health with enrollment. Results.Wefound a 78.5% enrollment rate for the newly eligible Medicaid population, translating to 3.8 million adults enrolled and 1.1 million adults who were eligible but did not enroll. Significant predictors of enrollment were participating in a public welfare program (odds ratio [OR] = 6.59; 95% confidence interval [CI] = 3.09, 14.04), having heart disease (OR = 4.03; 95% CI = 1.34, 12.15), being in the top quartile of income (OR = 3.59; 95% CI = 1.64, 7.85), enrolling in 2015 (OR = 3.28; 95% CI = 1.94, 5.56), being unemployed (OR = 2.10; 95% CI = 1.15, 3.82), and being female (OR = 1.71; 95% CI = 1.03, 2.85).Wedid not find significant disparities across race/ethnicity, education level, or geography. Conclusions. Repeal of Medicaid expansion would have a substantial effect on health insurance coverage among California's low-income adults, many of whom report chronic health conditions and no alternative sources of affordable coverage. Future research should examine the mechanisms explaining the higher enrollment rates among California's Medicaid expansion population. [ABSTRACT FROM AUTHOR]