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Income inequality, primary care, and health indicators.

BACKGROUND: The significant association of income inequality with a variety of health indicators is receiving increasing attention. There has also been increasing evidence of a link between primary care and improved health status. We examined the joint relationship between income inequality, availability of primary care, and various health indicators to determine whether primary care has an impact on health indicators by modifying the adverse effect of income inequality. METHODS: Our ecologic study used the US states as the units of analysis. In analyzing the data, we looked at the associations among income inequality, primary care, specialty care, smoking, and health indicators, using Pearson's correlation coefficients for intercorrelations and the adjusted multiple regression procedure. To examine the effect of inequality and primary care on health outcome indicators, we conducted path analyses according to a causal model in which inequality affects health both directly and indirectly through its impact on primary care. RESULTS: Our study indicates that both primary care and income inequality exerted a strong and significant direct influence on life expectancy and total mortality (P <.01). Primary care also exerted a significant direct influence on stroke and postneonatal mortality (P <.01). Although levels of smoking are also influential, the effect of income inequality and primary care persists after controlling for smoking. Primary care serves as one pathway through which income inequality influences population-level mortality and at least some other health outcome indicators. CONCLUSIONS: It appears possible that a primary care orientation may, in part, overcome the severe adverse effects on health of income inequalities.

Cerebrovascular Disorders↗

Changes in US health care access in the 90s: race and income differences from the CARDIA Study. Coronary Artery Risk Development in Young Adults.

OBJECTIVE: Health care financing is changing rapidly in the United States. We investigated whether and how health care access is changing concurrently with changes in financing, with special attention to a minority population. METHODS: We examined a longitudinal biracial (half African-American, half White) urban cohort of 3,565 individuals, aged 25-37 years old, in 1992-93 and again in 1995-96. We measured access by self-reported (1) health insurance status, (2) regular source of medical care, and (3) lack of care due to financial problems. RESULTS: In 1992-93, 30.3% of the cohort experienced at least one access barrier, with a decline to 26.8% in 1995-96 (P<.005). However, access improved more for Whites than for African Americans; and access improved for higher, but not for lower, income groups (7% improvement for high income, vs 2% deterioration for lower income, P<.01). In addition, there was an 11% to 19% absolute increase in individuals making co-payments for health care utilization across all race/sex groups, with African Americans having markedly higher proportions of cost-sharing. African-American, low income, and unemployed individuals reported more acute care, but fewer outpatient visits. Income and employment explained racial differences. CONCLUSION: While access has improved or stabilized for higher income groups, there is a widening gap according to income, accompanied by an acute care pattern for low income groups that may be both inadequate and cost inefficient.

Adolescent↗

Wanting, having, and satisfaction: examining the role of desire discrepancies in satisfaction with income.

In 3 studies, the authors tested the predictors of income satisfaction, examining whether discrepanc between the things people have and the things they desire predict satisfaction. Study 1 manipulated the desirability of items that can be purchased with participants' income, and showed that their satisfaction with that income depended on the desirability of these items. Study 2 demonstrated that whether people's income enabled them to purchase the things they desired influenced their satisfaction with income. Study 3 found that the effect of comparisons with a person's past on income satisfaction is completely mediated by one's desires; and the effect of social comparison on income satisfaction is partially mediated by desires. Thus, desires play a pivotal role in determining people's satisfaction with income.

Humans↗

Income inequality and health. Coastal communities in British Columbia, Canada.

OBJECTIVE: An imbalance in the distribution of economic resources, i.e., income inequality, is a characteristic of a community that may influence the aggregate health of the population. In North America, income inequality seems to be strongly related to mortality rates among American communities such as states and metropolitan areas but largely irrelevant for health at similar levels of geopolitical aggregation in Canada. This article summarizes relevant international and North American evidence and then explores relationships between income inequality and mortality rates among coastal communities in the province of British Columbia, Canada. METHODS: Cross-sectional analysis was conducted among twenty-four coastal communities in British Columbia, utilizing four measures based on the 1996 Census to measure income inequality and crude, age-standardized and age- and gender-specific mortality rates averaged over the five-year period 1994-98 to measure health. RESULTS: The three valid measures of income inequality were positively and significantly related to the crude mortality rate but were not significantly related to the age-standardized mortality rate. Two of the inequality measures were related to mortality rates for males aged 0-44 and for males aged 45-64 before but not after controlling for mean household income. DISCUSSION: Health researchers have yet to report a meaningful relationship between income inequality and population health within Canada. At the risk of committing the ecological fallacy, these findings provisionally support a psycho-social interpretation of the individual-level relationship between income and health wherein members of these communities compare themselves to an encompassing community, e.g., all Canadians.

Adolescent↗

Impact of income growth on household protein and calorie intake in Addis Ababa.

OBJECTIVES: To estimate calorie-income elasticity and to determine calorie and protein intake levels of Addis Ababa population. DESIGN: Cross-sectional study with descriptive and analytical component. SETTING: Addis Ababa, Ethiopia. PARTICIPANTS: One thousand three hundred and fifty seven households. RESULTS: The mean monthly income and expenditure on food per household were 467.14 and 253.33 birr respectively. The mean calorie intake per adult equivalent was found to be 1952.71 Kcal and mean protein intake per capita was 48.51 gm. The estimated income elasticity for food expenditure was 0.52, while income elasticity for calorie availability was 0.51. Income elasticity for calorie availability was much higher in the low-income group (0.57) than the well-off group (0.16). CONCLUSION: These results suggest that increase in income, seems to be a sufficient condition for nutritional improvement among the low-income group.

Eating↗

AIDS incidence and income.

Since 1987, the annual increases of AIDS incidence among homosexual and bisexual men have slowed but the increases among other risk groups have continued unabated. Although indirect evidence suggests the incidence change is related to medical care for HIV disease delaying the onset of AIDS, other explanations are also possible. To examine the incidence change from a different perspective, we classified the residents of Philadelphia (PA, U.S.A.) with AIDS by the per capita income of their census tracts of residence. AIDS incidence increased steadily in the lowest income tercile, showed continuing but smaller increases after 1987 in the middle tercile, and was level after 1987 in the highest income tercile. The relationship between income and changes of incidence persisted after stratification on race or mode of infection with HIV. Income was associated with private medical insurance at the time of diagnosis of AIDS (59% privately insured in the highest income tercile, 24% in the lowest) and with median survival after a diagnosis of AIDS (467 days in the highest tercile of income, 359 days in the lowest). These observations are consistent with a medical treatment benefit that reaches the highest tercile of income and does not reach the lowest one.

Acquired Immunodeficiency Syndrome↗

Income inequality and health in Ontario: a multilevel analysis.

OBJECTIVE: To examine the association of income inequality at the public health unit level with individual health status in Ontario. METHODS: Cross-sectional multilevel study carried out among subjects aged 25 years or older residing in 42 public health units in Ontario. Individual-level data drawn from 30,939 respondents in 1996-97 Ontario Health Survey. Median area income and income inequality (Gini coefficient) calculated from 1996 census. Self-rated health status (SRH) and Health Utilities Index (HUI-3) scores were used as main outcomes. RESULTS: Controlling for individual-level factors including income, respondents living in public health units in the highest tercile of income inequality had odds ratios of 1.20 (95% CI 1.04 - 1.38) for fair/poor self-rated health, and 1.11 (95% CI 1.01 - 1.22) for HUI score below the median, compared with people living in public health units in the lowest tercile. Controlling further for median area income had little effect on the association. CONCLUSION: Income inequality was significantly associated with individual self-reported health status at public health unit level in Ontario, independent of individual income.

Adult↗

Hong Kong men with low incomes have worse health-related quality of life as judged by SF-36 scores.

OBJECTIVE: To analyse the association between income and health-related quality of life using the Medical Outcome Study Short Form 36 (SF-36) Chinese version in Hong Kong Chinese working population. DESIGN: Cross-sectional observation study. SETTING: A commercial company in Hong Kong. PARTICIPANTS: All clerical and administrative staff of a commercial company was invited to participate; 876 of the 1003 staff agreed. The subjects were categorised into three income groups according to monthly income in Hong Kong dollars (low, < or =10,000; middle, >10,000-25,000; high, >25,000). The mean age of the 288 men and 588 women was 34.9 (standard deviation, 7.9; median, 34.0; range, 18-71) years. MAIN OUTCOME MEASURES: SF-36 scores on health-related quality of life. RESULTS: The distribution of income was 30% in high-, 54.8% in middle-, and 15.2% in low-income groups. Women had similar SF-36 scores among different income groups. In men, for most variables there was a significant positive linear correlation between income and SF-36 scores. CONCLUSION: Low income is associated with a worse health-related quality of life in Hong Kong Chinese men.

Adolescent↗

[Income of family physicians in Western Europe].

Although doctors tend to belong to the best paid categories of professionals, considerable differences between countries in average remuneration can be found. This study is focused on incomes (1985) of general practitioners (GP) in II Western European countries (Austria, Belgium, Denmark, Finland, France, West Germany, Italy, United Kingdom, the Netherlands, Norway and Sweden). Beside a description of the incomes (before taxation) as such, an attempt is made to correlate the income figures with some characteristics of the general practitioner's position in each country. The average GP income per country (before taxes) was ECU 43,600. The German (ECU 67,000), Austrian (ECU 56,000) and Danish (ECU 55,000) form the top, the Italian (ECU 14,000), Belgian (ECU 31,000) and Swedish (ECU 34,500) doctors the bottom-three. Correcting for OECD purchasing power parities does not change the rank order of the GP income in the different countries essentially. The more doctors per inhabitant, the lower the income, and the more different tasks the GP has to perform, the higher the income. Direct access of specialist care has no relationship with GP incomes.

Europe↗

Distribution of family income: improved estimates.

This article describes the results of research to improve estimates of the distribution of family income. In this research, a microdata file was constructed for 1972 using several data sources. The data obtained from these sources were combined and adjusted to produce more precise estimates. Current Population Survey estimates were then evaluated using these improved estimates. Using the improved estimates increased 1972 mean income for all units by 11 percent. The income share of the top 5 percent of the distribution increased substantially. Property income increased and wage and salary income decreased in relative importance. The mean income of family units headed by persons aged 65 or older increased by about 40 percent, by far the largest rise for any group examined; the increase was far lower for low-income family units in that age group. A simple update of mean incomes to 1979 showed no substantial changes from the 1972 pattern of adjustments.

Adolescent↗

Price and income changes for the elderly.

It is widely believed that inflation is harmful to the elderly. Two frequent arguments in support of this belief are that some important income sources for the elderly are less than fully indexed to inflation and that the elderly spend heavily on goods and services whose prices rise faster than the average inflation rate. This article focuses on both the income issue and the expenditure issue. The first part of the article evaluates the question of whether an economy-wide consumer price index is an adequate measure of the cost of living for the elderly population. The evaluation is made by constructing a consumer price index using expenditure weights that are more appropriate for the elderly population. It is found that over the 1967-79 period the movement of this constructed index was very similar to that of the economy-wide index. The constructed index did grow slightly faster than the economy-wide index, however. The second part of the article focuses on changes in average real incomes of the elderly over the 1970-77 period. Two dimensions of income changes are examined. First, the incomes of families headed by persons aged 65 or over are compared at different points in time. It is found that average real income of this age class was 10 percent higher in 1977 than in 1970. Second, the 1970 and 1977 incomes of the cohort of families headed by persons aged 65 or over in 1970 are compared. It is found that average real income of this cohort fell by 4 percent between 1970 and 1977.

Age Factors↗

Physician income targets: new evidence on an old controversy.

This study uses a unique set of data to identify the factors that affect physician income targets among a nationally representative sample of young (under age 40) physicians in 1987. The study reveals that income targets respond directly to actual income, but that this relationship is rather inelastic. Among self-employed physicians, for example, a 10% decline in actual income would reduce the target by only 3%. Thus, our study provides the first direct evidence to quantify how a decline in income will increase the divergence between actual and target income. Moreover, in quantifying this divergence, our results provide an upper bound on the dollar value of any demand inducement that may ensue. The results suggest that targets are set, at least in part, to compensate physicians for pecuniary and nonpecuniary costs associated with medical practice. Discrimination, dissatisfaction, financial risks, and training costs all appear to raise income targets. Physicians may desire higher incomes to compensate them for discrimination or other difficulties they have encountered in practicing medicine.

Adult↗

Taxation of Social Security benefits under the new income tax provisions: distributional estimates for 1994.

The 1993 Omnibus Budget Reconciliation Act raised the proportion of benefits includable in income for the Federal personal income tax. This article presents estimates of the income-distributional effects of the new provision in 1994, the first year for which it is effective. Under the pre-1993 law, up to 50 percent of benefits were included in taxable income for certain high-income beneficiaries. Under the new law, some of these beneficiaries are required to include an even higher proportion of benefits--up to 85 percent. Only 11 percent of beneficiary families, concentrated in the top three deciles by family income, include more of their benefits in taxable income under the new law than they would have under the old law. Another 8 percent include the same amount of benefits under either. The remaining beneficiary families, more than 80 percent, include no benefits in taxable income under either the old law or the new.

Forecasting↗

Subclinical beriberi polyneuropathy in the low income group: an investigation with special tools on possible patients with suspected complaints.

OBJECTIVE: To determine the prevalence rate of subclinical beriberi polyneuropathy (PNP) in the low income group and to present new methods for early detection. DESIGN: We conducted a prospective, randomized observational study on all patients from family members of non-PNP patients presenting to the outpatient neurologic clinic of the Dr Soetomo Hospital in 1989 in Surabaya, Indonesia. MATERIAL AND METHODS: The 53 group I patients belonged to the low income series, whereas the 56 group II patients were from the mid- and high-income groups. We analyzed their diets and determined their blood thiamine levels. Neurologic, internal, psychiatric as well as neurophysiologic examinations were performed on all patients. RESULTS: The prevalence rate of subclinical beriberi PNP of the apparently healthy subjects of the low income group was 66% compared with 12.5% among the mid and high income groups. The exposure odds ratio was 13.6 (95% Cl, 2.78 to 8.04) indicating that the low income group ran a greater risk of developing beriberi PNP than the mid and high income groups. CONCLUSION: Most of our low income group patients had an inadequate diet, especially concerning deficient thiamine intake. Analysis of the diets revealed, that they were usually rich in carbohydrate especially steamed milled rice, whereas intake of fat and thiamine was low, protein was just sufficient. The calorie intake was marginal. Carbohydrate rich and non fat calories in the diet with low thiamine intake may provoke beriberi.

Adolescent↗

Income class and pharmaceutical expenditure in Canada: 1964-1990.

In the 1970s, nearly all Canadian provinces introduced drug programs to subsidize purchases by low-income families. This study was undertaken to determine whether these programs were successful in reducing out-of-pocket pharmaceutical expenditures for low-income families and individuals, and to compare expenditures in this group with those of high-income families. Expenditures were calculated for a low- and a high-income group from Statistics Canada surveys conducted between 1964 and 1990. In the low-income group there was a 40% decline in drug expenditure measured as a percentage of total family expenditure and this was coincident with the introduction of provincial drug programs. However, the high-income group had an even larger decrease in drug expenditure. Per capita spending as a percentage of total family expenditure in the low-income group, was seven times that of the high-income group and there was no change in this ratio after the introduction of the drug plans.

Canada↗

Income and employment among homeless people: the role of mental health, health and substance abuse.

BACKGROUND: The homeless population is among the poorest of the poor in the United States. Employment and government programs are potential sources of income, but many homeless people face potential barriers to work: many have serious mental and physical disabilities, and many more have alcohol and drug disorders. As a result, most homeless who work do so either for a few hours per day or only some days, which provides little income. General Assistance, a public program of last resort, also provides a low level of income support. More income might be gained through higher levels of work or participation in income support programs for people with disabilities. AIMS OF THE STUDY: To investigate the characteristics of homeless people that impede them in the labor market and in government program participation, paying particular attention to their mental and physical health, as well as their alcohol and drug problems. DATA: Data are from a survey of the homeless population in Alameda County, California, conducted from 1991 to 1993. Our sample is 471 homeless adults randomly selected from area shelters and meal providers, who were reinterviewed approximately 6 months later, regardless of domiciliary status. Mental health and substance use problems were assessed using the Diagnostic Interview Schedule, a structured, psychiatric interview that uses criteria based on the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders 3rd edn (revised). Employment between the first and second interview is categorized as none, low level (less than 6 hours a day or fewer than half the days between interviews) or higher level (at least 6 hours a day for at least half the days). ANALYTICAL PROCEDURES: The models of employment status and program participation are recursive in that homelessness at the first wave of the survey is treated as given. Thus we explore whether, given their initial homelessness, persons can gain or maintain access to income between the two interviews, conditional on the sample member's homelessness, health and disability at the first interview. Using maximum-likelihood methods, we estimate a generalized ordered logit model of whether the person works not at all, at a low level or at a higher level. Participation in disability programs and GA are estimated as probit models over the subsamples of potentially eligible participants. RESULTS: While a surprisingly large number of homeless people work, few homeless persons are able to generate significant earnings from employment alone. Physical health problems that limit work or daily activities, in particular, are barriers to employment. Drug and alcohol abuse and dependence are positively associated with lower work level but are negatively related to higher work level. Program participation is quite low relative to eligibility. Those with physical health problems are substantially more likely than those with mental health problems to be in the more generous disability programs. Substance use disorders are also a barrier to participation in disability programs. DISCUSSION: Mental health, health and disability play a large role in the employment and program participation of the homeless and persons at risk for homelessness. Physical disabilities are a barrier to employment, and those with substance use disorders are most likely to work at lower levels that provide less income. Rates of participation in government programs are low, and people with major mental disorders have especially low participation rate in disability programs. The low rates of participation, particularly in the disability programs, suggest the need for continued research in improving access to income support programs among eligible homeless populations.

Journal Article↗

Self-reported health in high and very high incomes.

The objective of the present study was to investigate whether self-reported health (SRH), an overall health indicator, continues to improve as individual income increases to very high levels or whether there is a threshold above which this relationship changes direction. We used data from the 2003 US Current Population Survey, focusing on the upper income decile. We modelled the relationship between income and SRH before and after adjustment for other socio-demographic parameters that are known to influence SRH. In the unadjusted model, SRH increased with increasing income up to the threshold of $326,000, above which SRH declined. After adjustment for all major socio-demographic parameters (age, gender, race, education, and marital status), the adjusted curve showed monotonically increasing SRH with increasing income. Adjustment for each of these parameters separately revealed that the threshold effect was lost only after adjusting for education. There were more people with low levels of educational attainment among those receiving more than $500,000 per year, compared to other people in the upper income decile. Increasing income does not always improve SRH. People in the very high income bracket tend to report slightly worse health, which may be explained by their lower education.

Adult↗

The impact of filipino micro health-insurance units on income-related equality of access to healthcare.

BACKGROUND: This study aims to assess the impact of being insured by micro-health insurance units (MIUs) on equality of access to health care among groups with inequitable income distribution. We measure equality by relating income with access to healthcare. The analysis is based on a household survey conducted in five regions in the Philippines in 2002. METHODS: We generated concentration curves and indices (CI) for insured and uninsured households (150 for each cohort in each region). We also elaborated a method to retain the relative income rank of households when data were aggregated across regions, as the regions had quite different nominal income levels. RESULTS: We found a significant effect of household income on access to hospitalizations among the uninsured households (a positive CI), but no such effect among the insured households (CI close to zero). As regards professionally attended deliveries, an increased tendency of poorer households to deliver at home (CI slightly negative) and a lower rate of deliveries in hospital (CI slightly positive and statistically significant) were reported by both uninsured and insured households. Access to consultations was unrelated to income among the insured (CI close to 0), but negatively correlated with income among the uninsured (a positive and significant CI). CONCLUSION: We conclude that MIUs in Philippines improve income-related equality of access to hospitalization and medical consultation in cases of illness. The findings of this study strengthen a claim for government support for the operation of MIUs as successful (albeit micro) suppliers of health insurance.

Cross-Sectional Studies↗