Absolute Concentration Index Research Articles

Statistical inferences of extended concentration indices for directly standardized rates.

The relative concentration index (RCI) and the absolute concentration index (ACI) have been widely used for monitoring health disparities with ranked health determinants. The RCI has been extended to allow value judgments about inequality aversion by Pereira in 1998 and by Wagstaff in 2002. Previous studies of the extended RCI have focused on survey sample data. This paper adapts the extended RCI for use with directly standardized rates (DSRs) calculated from population-based surveillance data. A Taylor series linearization (TL)-based variance estimator is developed and evaluated using simulations. A simulation-based Monte Carlo (MC) variance estimator is also evaluated as a comparison. Following Wagstaff's approach in 1991, we extend the ACI for use with DSRs. In all simulations, both the TL and MC methods produce valid variance estimates. The TL variance estimator has a simple, closed form that is attractive to users without sophisticated programming skills. The TL and MC estimators have been incorporated into a beta version of the National Cancer Institute's Health Disparities Calculator, a free statistical software tool that enables the estimation of 11 commonly used summary measures of health disparities for DSRs.

Socioeconomic distribution of GP visits following patient choice reform and differences in reimbursement models: Evidence from Sweden

ObjectiveThis study aims to analyse changes in the socioeconomic distribution of GP visits following primary care patient choice reform, and to compare their magnitude and direction in pure capitation, versus capitation/activity-based mixed, provider reimbursement settings. MethodsWe compute absolute and relative concentration indices using total population registry data from three Swedish counties (N∼3.6 million) two years pre, to two years post, reform. We decompose the indices by the contribution of first, non-recurrent and recurrent visits, and compare their changes in the different provider reimbursement settings. ResultsIn all three counties, the number of visits increased for all population groups. Increases were larger, and distributional changes more pro-poor, in the county with mixed reimbursement. Visit increases were mostly driven by recurrent and, especially, non-recurrent, visits, which were increasingly pro-poor in all counties in absolute, but not in relative, terms. First visits either became decreasingly pro-poor, or did not change significantly. Exclusion of high users removed the pro-poor patterns in the two counties with pure capitation. ConclusionsThe reform led to increased access to GP visits, but implied small changes in their socioeconomic distribution. In combination with provider reimbursement models with incentives for higher visit volumes, changes were more pro-poor over time, but it is not clear whether this was at the expense of reduced visit length or content.

Socioeconomic inequalities in health among Indigenous peoples living off-reserve in Canada: Trends and determinants

Using three nationally representative Aboriginal Peoples Surveys (2001, 2006 and 2012, n = 68,040), we examined income-related inequalities in self-perceived poor/fair general health status among Indigenous adults (18+) living off-reserve in Canada. We used the relative and absolute concentration indices (RC and AC, respectively) to quantify income-related inequalities in health for men and women, within the three Indigenous populations (First Nations, Métis, and Inuit), and in different geographic regions. Moreover, we performed decomposition analysis to determine factors that explain income-related inequality in health within the Indigenous peoples living off-reserve in Canada. The prevalence of poor/fair health status among the Indigenous population living off-reserve increased from 18% in 2001 to 22% in 2012. The extent of pro-rich relative (absolute) income-related inequalities in health increased by 23% (42%) from 2001 to 2012. Income-related inequalities in health increased statistically significantly within First Nations and Métis populations as well as in Atlantic provinces, Ontario, Alberta, British Columbia and Territories. Decomposition analyses indicated that, besides income itself, occupational status and educational attainment were the most important factors contributing to the pro-rich distribution of health among Indigenous peoples living off-reserve. Growing socioeconomic inequalities in health among Indigenous peoples should warrant more attention. Policies designed to address the broader array of social determinants of health may mitigate the continuing inequalities in health among Indigenous peoples living off-reserve in Canada.

Race- and Income-Related Inequalities in Oral Health in Australian Children by Fluoridation Status.

Inequality in child oral health exists by race and income. Water fluoridation (WF) is effective in caries prevention, but evidence for WF reducing inequality in caries experience is equivocal. This study tested the hypothesis that WF reduces race- and income-related inequality in child caries experience. A cross-sectional national population-based study of child oral health was conducted across 2012 to 2014 for Australian children aged 5 to 14 y, involving a parental questionnaire and an oral epidemiological examination. Children were stratified by fluoridated (F) and nonfluoridated (NF) area of residence, equivalized household income quartiles, and Indigenous and non-Indigenous status. Directly standardized caries experience (measured by the decayed, missing, or filled tooth surfaces [dmfs/DMFS] in both primary [age 5-10] and permanent dentitions [age 9-14]) was estimated for each stratum accounting for the complex sampling design. Differences in caries experience by Indigenous status and equivalized income quartiles were examined between F and NF strata. Socioeconomic inequality in caries experience was examined using the Absolute Concentration Index (ACI), Slope Index of Inequality (SII), Relative Concentration Index (RCI), and Relative Index of Inequality (RII). A total of 21,328 (86.5%) children had complete data. Caries experience was higher in NF than F strata. Race- and income-related gradients in caries experience were observed in both F and NF areas. All indexes of inequality indicated that caries experience was concentrated among lower income groups. Absolute inequalities were consistently lower in F than in NF areas. For the primary dentition, SII values were -4.18 versus -6.20 in the F and NF areas, respectively. The respective values were -0.60 versus -1.66 for the permanent dentition. Income-related inequality in caries was lower in F than in NF areas for both Indigenous and non-Indigenous children. WF was associated with lower caries experience and reduced inequality among children. Knowledge Transfer Statement: The results of this study greatly increase the evidence base that water fluoridation is effective and socially equitable. Dental caries has remained one of the most prevalent chronic conditions in children worldwide. The presented evidence can be used by policy makers and the profession to support the maintenance or expansion of this important public health program to benefit those most at risk of dental caries, the groups at the lowest socioeconomic position in any society.

Does socioeconomic status affect lengthy wait time in Canada? Evidence from Canadian Community Health Surveys.

Reasonable access to health services without financial or other barriers is a primary objective of the Canadian health system. Notwithstanding such concern about accessibility of services, long waiting times for health services have been a prominent health policy issue in recent years. Using pooled data from four nationally representative Canadian Community Health Surveys (CCHSs, 2000/01, 2003, 2005 and 2010; n=266,962) we examine socioeconomic inequality in lengthy wait time (LWT) to health care among adults (aged 18-65) in Canada. The relative and absolute concentration indices (RC and AC, respectively) are used to quantify income-related inequality in LWT in Canada and for its provinces. Additionally, we decompose the RC and AC indices to identify factors affecting income-related inequality in LWT. Our descriptive results show that, on average, 5% of Canadian adults experienced LWT to access health services in the past 12months. While 3% of the residents of British Columbia and Saskatchewan reported LWT to access health care services, this figure was 7% in Quebec. Our findings also demonstrated that LWT was mainly concentrated among the poor in Canada [RC=-0.039; 95% confidence interval (CI) -0.049 to -0.028 and AC=-0.067; CI -0.086 to -0.049]. The RC and AC suggested statistically significant pro-rich inequality of LWT in Nova Scotia, New Brunswick, Quebec, Manitoba, Saskatchewan and British Columbia. Decomposition analyses indicate that, besides income itself, health status (measured by a set of 15 chronic condition indicators), immigration status and geographical factors were the most important factors contributing to the concentration of LWT among the poor in Canada. These results provide some evidence that low-income individuals tend to have lengthier wait times for publicly-funded health care in Canada in comparison to their high-income counterparts. The observed negative gradient between income and long waiting time may be interpreted as evidence of socioeconomic inequity within Canadian health care system. Thus, further work is required to understand the mechanisms explaining the concentration of long wait time among the poor in Canada.

Assessing disparities in colorectal cancer mortality by socioeconomic status using new tools: health disparities calculator and socioeconomic quintiles

PurposeColorectal cancer mortality rates dropped by half in the past three decades, but these gains were accompanied by striking differences in colorectal cancer mortality by socioeconomic status (SES). Our research objective is to examine disparities in colorectal cancer mortality by SES, using a scientifically rigorous and reproducible approach with publicly available online tools, HD*Calc and NCI SES Quintiles.MethodsAll reported colorectal cancer deaths in the United States from 1980 to 2010 were categorized into NCI SES quintiles and assessed at the county level. Joinpoint was used to test for significant changes in trends. Absolute and relative concentration indices (CI) were computed with HD*Calc to graph change in disparity over time.ResultsDisparities by SES significantly declined until 1993–1995, and then increased until 2010, due to a mortality drop in populations living in high SES areas that exceeded the mortality drop in lower SES areas. HD*Calc results were consistent for both absolute and relative concentration indices. Inequality aversion parameter weights of 2, 4, 6 and 8 were compared to explore how much colorectal cancer mortality was concentrated in the poorest quintile compared to the richest quintile. Weights larger than 4 did not increase the slope of the disparities trend.ConclusionsThere is consistent evidence for a significant crossover in colorectal cancer disparity from 1980 to 2010. Trends in disparity can be accurately and readily summarized using the HD*Calc tool. The disparity trend, combined with published information on the timing of screening and treatment uptake, is concordant with the idea that introduction of medical screening and treatment leads to lower uptake in lower compared to higher SES populations and that differential uptake yields disparity in population mortality.

Decomposing Socioeconomic Inequality Determinants in Suicide Deaths in Iran: A Concentration Index Approach.

BackgroundIt is recognized that socioeconomic status (SES) has a significant impact on health and wellbeing; however, the effect of SES on suicide is contested. This study explored the effect of SES in suicide deaths and decomposed inequality into its determinants to calculate relative contributions.MethodsThrough a cross-sectional study, 546 suicide deaths and 6,818 suicide attempts from January 1, 2010 to December 31, 2014 in Ilam Province, Western Iran were explored. Inequality was measured by the absolute concentration index (ACI) and decomposed contributions were identified. All analyses were performed using STATA ver. 11.2 (Stata Corp., College Station, TX, USA).ResultsThe overall ACI for suicide deaths was -0.352 (95% confidence interval, -0.389 to -0.301). According to the results, 9.8% of socioeconomic inequality in suicide deaths was due to addiction in attempters. ACI ranged from -0.34 to -0.03 in 2010–2014, showing that inequality in suicide deaths declined over time.ConclusionFindings showed suicide deaths were distributed among the study population unequally, and our results confirmed a gap between advantaged and disadvantaged attempters in terms of death. Socioeconomic inequalities in suicide deaths tended to diminish over time, as suicide attempts progressed in Ilam Province.

Social inequality in dental caries and changes over time among Indigenous and non‐Indigenous Australian children

ObjectiveThis paper describes and compares magnitudes of socioeconomic (SES) inequalities in oral health among Indigenous and non‐Indigenous children over a 10‐year period. MethodsWe analysed annual oral health survey data from NSW, NT and SA. Data were extracted for time period 1 (2000–2002, N=215,317) and time period 2 (2007–2010, N=34,495). Oral health outcomes were untreated decayed deciduous teeth (dt) and cumulative dental caries experience (dmft). Postcode‐level Socioeconomic Index for Areas was used to assess SES. Age standardisation and complex survey weights were used. Indices of socioeconomic inequality in health (Slope Index of Inequality, Relative Index of Inequality, Absolute and Relative Concentration Index) were used to quantify inequality in dental caries and its changes over time. ResultsOral health outcomes deteriorated in both Indigenous and non‐Indigenous populations over time. Indigenous children experienced higher levels of disease at both times. Untreated dt increased in both populations. The cummulative disease (dmft) increased at higher rate among children in low‐SES areas in both populations. Over time, there was an increase in socioecononomic inequalities in dmft in all children and in dt in non‐Indigenous children. ConclusionArea‐level socioeconomic inequality in child oral health has widened due to deterioration in low‐SES children.

The socioeconomic gradient of secondhand smoke exposure in children: evidence from 26 low-income and middle-income countries

ObjectiveTo provide the first analysis of socioeconomic inequalities in children's daily exposure to indoor smoking in households in 26 low-income and middle-income countries (LMICs).MethodsWe used nationally representative household samples (n=369...

Educational disparity in obesity among U.S. adults, 1984–2013

PurposeExamine the annual trends in educational disparity in obesity among U.S. adults aged 18 years and more from 1984 to 2013. MethodsSecondary data analysis of 6,147,379 participants in a repeated cross-sectional nationally representative health survey of U.S. adults. ResultsThe obesity prevalence among people with primary school or lower education increased from 17.46% or 3.41 times the prevalence among college graduates (5.12%) in 1984 to 36.16% or 1.73 times the prevalence among college graduates (20.94%) in 2013. In any given year, the obesity prevalence increased monotonically with lower education level. The obesity prevalence across education subgroups without a college degree gradually converged since early 2000s, whereas that between those subgroups and college graduates diverged since late 1980s. Absolute educational disparity in obesity widened by 60.84% to 61.14% during 1984–2013 based on the absolute concentration index and the slope index of inequality, respectively; meanwhile, relative educational disparity narrowed by 52.06% to 52.15% based on the relative index of inequality and the relative concentration index, respectively. The trends in educational disparity in obesity differed substantially by gender, race/ethnicity, age group, and obesity severity. ConclusionsThere was substantial educational disparity in obesity among U.S. adults and the trend differed across population subgroups.

Inequalities in maternal health care utilization in sub-Saharan African countries: a multiyear and multi-country analysis.

To assess social inequalities in the use of antenatal care (ANC), facility based delivery (FBD), and modern contraception (MC) in two contrasting groups of countries in sub-Saharan Africa divided based on their progress towards maternal mortality reduction. Six countries were included in this study. Three countries (Ethiopia, Madagascar, and Uganda) had <350 MMR in 2010 with >4.5% average annual reduction rate while another three (Cameroon, Zambia, and Zimbabwe) had >550 MMR in 2010 with only <1.5% average annual reduction rate. All of these countries had at least three rounds of Demographic and Health Surveys (DHS) before 2012. We measured rate ratios and differences, as well as relative and absolute concentration indices in order to examine within-country geographical and wealth-based inequalities in the utilization of ANC, FBD, and MC. In the countries which have made sufficient progress (i.e. Ethiopia, Madagascar, and Uganda), ANC use increased by 8.7, 9.3 and 5.7 percent, respectively, while the utilization of FBD increased by 4.7, 0.7 and 20.2 percent, respectively, over the last decade. By contrast, utilization of these services either plateaued or decreased in countries which did not make progress towards reducing maternal mortality, with the exception of Cameroon. Utilization of MC increased in all six countries but remained very low, with a high of 40.5% in Zimbabwe and low of 16.1% in Cameroon as of 2011. In general, relative measures of inequalities were found to have declined overtime in countries making progress towards reducing maternal mortality. In countries with insufficient progress towards maternal mortality reduction, these indicators remained stagnant or increased. Absolute measures for geographical and wealth-based inequalities remained high invariably in all six countries. The increasing trend in the utilization of maternal care services was found to concur with a steady decline in maternal mortality. Relative inequality declined overtime in countries which made progress towards reducing maternal mortality.

China's three-year health reform program and equity in sanitation improvement: a panel analysis.

BackgroundAccessible improved sanitation is critical to child health, and inequities in improved sanitation can be interpreted as health inequities across socio-economic groups. From 2009 to 2011, the Chinese government invested 4.448 billion yuan for rural sanitation improvement through a 3-year health reform program. This study assesses the inequity of sanitation improvement in rural China from 2003 to 2011 and examines whether the 3-year health reform program promoted equity in sanitation improvement.MethodsData from the China Health Statistics Yearbooks of 2004 to 2012 and the National Bureau of Statistics of China were used to create the concentration curve (CC), concentration index (CI), and absolute concentration index (ACI) of improved sanitation. Data of central investment for sanitation improvement in each province of China for 2009, 2010, and 2011 was gained through correspondence and used to create the CC and CI for investment.ResultsAlthough the CIs of improved sanitation are lower than the CIs of the net income of rural residents, the latter have an obvious downtrend. The CIs of improved sanitation increased from 2003 until 2008 and started to drop in 2009. As a result, by 2011, the CIs of improved sanitation had reached their 2003 levels. The ACI of improved sanitation decreased slightly from 2003 to 2008, but declined sharply from 2009 to 2011. The CIs of central investment for 2009, 2010, and 2011 are negative and the CCs of central investment are above the line of absolute equality, indicating that investments had been concentrated more on poorer provinces and regions.ConclusionsThe equality of rural residents’ net income has been improving each year, whereas equity in sanitation improvement deteriorated from 2003 to 2008. However, equity in sanitation improvement has increased since 2009 due to central investment in sanitation improvement during the 3-year health reform program that benefits low-income areas more. It is clear that the 3-year health reform program played an important role in promoting the level and equity of sanitation improvement.Electronic supplementary materialThe online version of this article (doi:10.1186/s12889-015-1364-7) contains supplementary material, which is available to authorized users.

Income‐related inequalities in inadequate dentition over time in Australia, Brazil and USA adults

To assess changes over time of the absolute and relative household income-related inequalities in inadequate dentition (ID) among Australians, Brazilians and USA adults. This study used nationwide oral health survey data from Australia (n = 1200 in 1999; n = 2729 in 2005), Brazil (n = 13 431 in 2003; n = 9779 in 2010) and USA (n = 2542 in 1999; n = 1596 in 2005). Absolute income inequalities were calculated using Absolute Concentration Index (ACI) and Slope Index of Inequality (SII), while relative inequalities were calculated using Relative Concentration Index (RCI) and Relative Index of Inequality (RII). Prevalence of ID in the studied period dropped from 8.7% to 3.1% in Australia; from 42.1% to 22.4% in Brazil; and remained stable in USA, nearly 8.0%. Absolute income inequalities were highest in Brazil, followed by the USA and Australia; relative inequalities were lower in Brazil than in Australia and the USA. ID was higher among Brazilian females (2010) and for the poorest group in all countries and periods. A remarkable reduction in absolute inequalities were found in Australia [Slope Index of Inequality (SII) and AIC 60%] and in Brazil (SII 25%; ACI 33%) while relative inequalities increased both in Australia (RCI and RII 40%) and in Brazil (RCI 24%; RII 38%). No changes in absolute and relative income inequalities were found in the USA. There were still persistent absolute and relative income inequalities in ID in all examined countries. There has been a reduction in absolute income inequalities in ID but an increase in relative income inequalities.

Social inequality in infant mortality: What explains variation across low and middle income countries?

Growing work demonstrates social gradients in infant mortality within countries. However, few studies have compared the magnitude of these inequalities cross-nationally. Even fewer have assessed the determinants of social inequalities in infant mortality across countries. This study provides a comprehensive and comparative analysis of social inequalities in infant mortality in 53 low-and-middle-income countries (LMICs). We used the most recent nationally representative household samples (n = 874,207) collected through the Demographic Health Surveys (DHS) to calculate rates of infant mortality. The relative and absolute concentration indices were used to quantify social inequalities in infant mortality. Additionally, we used meta-regression analyses to examine whether levels of inequality in proximate determinants of infant mortality were associated with social inequalities in infant mortality across countries. Estimates of both the relative and the absolute concentration indices showed a substantial variation in social inequalities in infant mortality among LMICs. Meta-regression analyses showed that, across countries, the relative concentration of teenage pregnancy among poorer households was positively associated with the relative concentration of infant mortality among these groups (beta = 0.333, 95% CI = 0.115 0.551). Our results demonstrate that the concentration of infant deaths among socioeconomically disadvantaged households in the majority of LMICs remains an important health and social policy concern. The findings suggest that policies designed to reduce the concentration of teenage pregnancy among mothers in lower socioeconomic groups may mitigate social inequalities in infant mortality.

Determinants of relative and absolute concentration indices: evidence from 26 European countries.

IntroductionThe aim of publicly-provided health care is generally not only to produce health, but also to decrease variation in health by socio-economic status. The aim of this study is to measure to what extent this goal has been obtained in various European countries and evaluate the determinants of inequalities within countries, as well as cross-country patterns with regard to different cultural, institutional and social settings.MethodsThe data utilized in this study provides information on 440,000 individuals in 26 European countries and stem from The European Union Statistics on Income and Living Conditions (EU-SILC) collected in 2007. As measures of income-related inequality in health both the relative concentration indices and the absolute concentration indices are calculated. Further, health inequality in each country is decomposed into individual-level determinants and cross-country comparisons are made to shed light on social and institutional determinants.ResultsIncome-related health inequality favoring the better-off is observed for all the 26 European countries. In terms of within-country determinants inequality is mainly explained by income, age, education, and activity status. However, the degree of inequality and contribution of each determinant to inequality varies considerably between countries. Aggregate bivariate linear regressions show that there is a positive association between health-income inequality in Europe and public expenditure on education. Furthermore, a negative relationship between health-income inequality and income inequality was found when individual employee cash income was used in the health-concentration measurement. Using that same income measure, health-income inequality was found to be higher in the Nordic countries than in other areas, but this result is sensitive to the income measure chosen.ConclusionsThe findings indicate that institutional determinants partly explain income-related health inequalities across countries. The results are in accordance with previously published theories hypothesizing social mobility as the explanation for differences in health-income inequalities between countries and higher health-income inequality could be a result of lower income inequality.

Measuring Socioeconomic Disparities in Cancer Incidence in Tehran, 2008

Health disparities exist among and within countries, while developing and low income countries suffer more. The aim of this study was to quantify cancer disparities with regard to socioeconomic position (SEP) in 22 districts of Tehran, Iran. According to the national cancer registry, 7599 new cancer cases were recorded within 22 districts of Tehran in 2008. Based on combined data from census and a population-based health equity study (Urban HEART), socioeconomic position (SEP) was calculated for each district. Index of disparity, absolute and relative concentration indices (ACI and RCI) were used for measuring disparities in cancer incidence. The overall cancer age standardised rate (ASR) was 117.2 per 100,000 individuals (120.4 for men and 113.5 for women). Maximum ASR in both genders was seen in districts 6, 3, 1 and 2. Breast, colorectal, stomach, skin and prostate were the most common cancers. Districts with higher SEP had higher ASR (r=0.9, p<0.001). Positive ACI and RCI indicated that cancer cases accumulated in districts with high SEP. Female disparity was greater than for men in all measures. Breast, colorectal, prostate and bladder ASR ascended across SEP groups. Negative ACI and RCI in cervical and skin cancers in women indicate their aggregation in lower SEP groups. Breast cancer had the highest absolute disparities measure. This report provides an appropriate guide and new evidence on disparities across geographical, demographic and particular SEP groups. Higher ASR in specific districts warrants further research to investigate the background predisposing factors.

Abstract P388: Trends in Socioeconomic Disparities in Ideal Cardiovascular Health: NHANES 1999–2006

Background: Socioeconomic status (SES) has been shown to be associated with many cardiovascular (CV) risk factors. Prior studies have identified differences by SES, but have not summarized trends in these disparities across multiple SES subgroups, which could allow us to assess the extent to which we are achieving disparity-related goals. Methods: We used NHANES Surveys from cycles 1999–2000, 2001–2002, 2003–2004, and 2005–2006 to examine the age-adjusted prevalence of ideal levels of CV health components by SES. Ideal levels of BMI, cholesterol, glucose, blood pressure, diet, physical activity and smoking were defined according to the AHA 2020 strategic goals. SES was defined by poverty: income ratio and categorized as &lt;1.00, 1.00-2.99, and 3.00+. Both absolute (Absolute Concentration Index- ACI) and relative measures (Relative Concentration Index -RCI) of disparities were calculated, all calculations were weighted by population share. The percentage change in disparities relative to 1999–2000 was examined. Results: Age-adjusted rates of ideal CV health components and the percentage change from 1999–2006 varied by SES (see Table). Among women, disparities in the prevalence rates of ideal levels of CV risk factors have increased between SES groups from 1999 through 2006. Among men, disparities in blood pressure (ACI=503%, RCI=477%) and diet (ACI=405%, RCI=143%) have increased most dramatically. More moderate increases were seen in disparities in smoking and cholesterol for men. Disparities in BMI and physical activity remained relatively constant among men throughout the study period. Findings were generally similar for both absolute and relative measures of disparities. Conclusions: Representative national data on these summary measures of disparities suggest that disparities between SES groups have increased among men. Understanding the issues underlying these increasing disparities and addressing them will be critical to improving the cardiovascular health of all Americans by 2020 and beyond.

Language and literacy relate to lack of children’s dental sealant use

This study aimed to determine the percent of California's third grade public school children lacking sealants by child and family factors and to measure social disparities for lacking sealants. The study analyzed data from the California Oral Health Needs Assessment (COHNA) 2004-2005, a complex stratified cluster sample of children (n = 10,450) from 182 randomly selected public elementary schools in California. The dependent variable was absence of sealants in first permanent molars. The independent variables included child race/ethnicity; socio-economic position (SEP) measured as child's participation in the free or reduced-price lunch program at the individual and school level; acculturation measured as language spoken at home and school level percent of English language learners; and parent functional health literacy measured as correctly following questionnaire instructions. Absolute differences and health disparity indices (i.e. Slope Index of Inequality, Relative Index of Inequality-mean, Absolute Concentration Index) were used to measure absolute and relative disparities. The percent of children lacking sealants was high in all racial/ethnic groups; no child or school level SEP differences in lacking sealants were seen, but significant differences existed by acculturation (child and school level) and parental functional health literacy. NonEnglish language and poor parental functional health literacy are potential barriers that need to be addressed to overcome disparities in sealant utilization.

Temporal trends in area socioeconomic disparities in breast-cancer incidence and mortality, 1988–2005

Since an overarching goal of Healthy People 2010 was to eliminate health disparities, we determined temporal trends in socioeconomic disparities in five breast-cancer indicators (in situ, stage I, lymph-node positive, and locally advanced breast-cancer incidence, and breast-cancer mortality) by county socioeconomic deprivation using 1988-2005 population-based breast-cancer data. Using 1988-2005 data from women aged 40 and older from 200 counties in the Surveillance, Epidemiology, and End Results program, we examined trends in temporal disparities in the five breast-cancer indicators across quartiles of county socioeconomic deprivation. County-level trends were summarized using the estimated annual percentage change. Observed county rates were smoothed using Bayesian hierarchical spatiotemporal methods to calculate measures of absolute and relative disparity (using absolute and relative concentration indices) and their changes over time. Large increases in in situ breast cancer rates since 1988 were observed for each of the deprivation quartiles. Absolute and relative disparity both increased over time, suggesting increasing disparities across levels of county deprivation. Absolute and relative concentration indices were near zero for the other four breast-cancer indicators, suggesting no disparities among the four quartiles of county deprivation during 1988-2005. Efforts to target counties aimed at increasing breast-cancer screening based on their level of deprivation will not likely be beneficial.

Diagnosis of Nutrient Imbalance in Mango by DRIS and PCA Approaches

Nutrient concentration in Totapuri cultivar of mango leaf as affected by application of varying levels of nitrogen (N), phosphorus (P), or potassium (K) was monitored in three field experiments for a period of nine years from 1991 to 1999. A data bank of nutrient concentration vs. fruit yield was established based on the mean nutrient concentration determined for different treatments. The data was further sub-divided into low and high yielding population based on yield performance. The Diagnosis and Recommendation Integrated System (DRIS) ratio norms were developed from high yielding population, while diagnosis of nutrient imbalance was made in low yielding plants. Forty-five nutrient expressions were chosen as diagnostic norms. Not withstanding application of a wide range of major nutrient doses, fruit yield was low in four to five cropping seasons. DRIS indices showed no signs of improvement nor there was a trend with application of N, P, or K at different levels. Some measures of total imbalance of nutrients in plant were reflected through sum of DRIS indices irrespective of sign. The greater imbalance of nutrients resulted in lower fruit yield. Principal Component Analysis (PCA) was applied to extract the correlation structure among the nutrient in low and high yielding plants and for DRIS indices. The first PC derived by PCA performed both on absolute nutrient concentration and DRIS indices was designated as (N−P + Mg−S + Fe + Cu+). Involvement of several nutrients in a single PC indicated that, it was not possible to diagnose nutrient imbalance of any particular nutrient in isolation in fruit crops like mango. The nutrient concentration variation in mango leaf appears to be an overall orchard phenomenon rather than individual tree phenomenon.