Proxy Measure Of Socioeconomic Status Research Articles

Trajectories in mammographic breast screening participation in middle-age overweight and obese women: A retrospective cohort study using linked data

ObjectivesDespite the established benefits and availability of mammographic breast screening, participation rates remain suboptimal. Women with higher BMIs may not screen regularly, despite being at increased risk of postmenopausal breast cancer and worse outcomes. This study investigated the association between prospective changes in BMI and longitudinal adherence to mammographic screening among women with overweight or obesity. MethodsRetrospective cohort study of women (N = 2822) participating in the Australian Longitudinal Study on Women's Health with an average follow-up of 20 years, with screening participation enumerated via BreastScreen NSW, Australia clinical records over the period 1996–2016. Association between BMI and subsequent adherence to screening was investigated in a series of marginal structural models, incorporating a time variant/invariant socio-demographic, clinical, and health behaviour confounders. Models were also stratified by a proxy measure of socio-economic status (education). ResultsParticipants with overweight/obesity were less adherent to mammography screening, compared to healthy/underweight participants (OR=1.29, 95 % CI=1.07, 1.55). The association between overweight/obesity and non-adherence was higher among those who ever had private health insurance (OR=1.30, 95 % CI=1.05, 1.61) compared to those who never had private health insurance and among those with lower educational background (OR=1.38, 95 % CI=1.08, 1.75) compared to those with higher educational background. ConclusionsLong-term impacts on screening participation exist among women with higher BMI, who are less likely to participate in routinely organised breast screening. Women with a higher BMI should be a focus of efforts to improve breast screening participation, particularly given their increased risk of breast cancer and association of higher BMI with worse breast cancer outcomes among older women.

Bayesian multilevel modelling of the association between socio-economic status and stunting among under-five-year children in Tanzania

BackgroundStunting is associated with socioeconomic status (SES) which is multidimensional. This study aimed to compare different SES indices in predicting stunting.MethodsThis was the secondary data analysis using Tanzania Demographics and Health Surveys (TDHS). The study used 7492, 6668, and 8790 under-five-year children from TDHS 2004/5, 2010, and 2015/16, respectively. The Household Wealth Index (HWI); Water and Sanitation, Assets, Maternal education and Income (WAMI); Wealth Assets, Education, and Occupation (WEO); and the Multidimensional Poverty Index (MPI) indices were compared. The summated scores, principal component analysis (PCA), and random forest (RF) approaches were used to construct indices. The Bayesian and maximum likelihood multilevel generalized linear mixed models (MGLMM) were constructed to determine the association between each SES index and stunting.ResultsThe study revealed that 42.3%, 38.4%, and 32.4% of the studied under-five-year children were stunted in 2004/5, 2010, and 2015/16, respectively. Compared to other indicators of SES, the MPI had a better prediction of stunting for the TDHS 2004/5 and 2015/16, while the WAMI had a better prediction in 2010. For each score increase in WAMI, the odds of stunting were 64% [BPOR = 0.36; 95% CCI 0.3, 0.4] lower in 2010, while for each score increase in MPI there was 1 [BPOR = 1.1; 95% CCI 1.1, 1.2] times higher odds of stunting in 2015/16.ConclusionThe MPI and WAMI under PCA were the best measures of SES that predict stunting. Because MPI was the best predictor of stunting for two surveys (TDHS 2004/5 and 2015/16), studies dealing with stunting should use MPI as a proxy measure of SES. Use of BE-MGLMM in modelling stunting is encouraged. Strengthened availability of items forming MPI is inevitable for child growth potentials. Further studies should investigate the determinants of stunting using Bayesian spatial models to take into account spatial heterogeneity.

Higher Family Affluence is Associated With Multi-Sport Participation Among Irish Youth.

The impact of early single sport participation among young people has received much attention, with both sport leaders and pediatricians advocating multi-sport participation at least until early adolescence. In this study we explored the association between family socioeconomic status and level of Irish youth specialization in sport. We relied on data from the Children's Sport Participation and Physical Activity (CSPPA) study, involving a representative sample of 3499 Irish children and adolescents aged 10-15years. We analyzed data from questions related to the number of sports played, the number of days per week the youth were engaged in sport, and family affluence (as a proxy measure for socioeconomic status). Youth sport specialization before 12years of age (males 5.7%; females 4.2%) and even between 13-15years of age (males, 7.8%; females, 5.8%) was uncommon. However, lower levels of specialization were associated with higher socioeconomic status in that more children with high family affluence participated in multiple sports. Careful consideration should be given to whether low socioeconomic status may act as a barrier to participation in multiple sports.

Socioeconomic Status and Cochlear Implant Usage: A Datalogging Study.

To evaluate the associations between proxy measures of socioeconomic status (SES) and usage of cochlear implants. Retrospective case series. Usage outcomes were measured among patients with a cochlear implant and data logging at a tertiary care children's hospital between 2002 and 2017. Time per day with cochlear implant turned on, coil off, and listening to speech in noise and speech in quiet were extracted from audiology records, averaging right and left ear usage for those with bilateral implants. Associations between cochlear implant usage and demographic factors such as insurance type and median household income for zip code were assessed. There were 142 total patients; 74 had bilateral usage data. Mean on air time was 10.76 hours (SD: 4.4). Those with private insurance had 1.2 hour more on air time/day (P = .047) and 0.9 hour more quiet time/day (P = .011) compared to those with public insurance. Younger age at last visit was associated with increased speech in quiet (B = -.08; 95% CI: -0.12-[-0.05], P < .001) and coil off (B = -0.06; 95% CI: -0.11-[-0.02], P = .006). Younger age at implant was associated with longer duration since last data logging visit (B = -10.46; 95% CI: -18.41-[-2.51], P = .010), more daily use (on air; B = -0.23; 95% CI: -0.43-[-0.03], P = .026), and increased time spent listening to speech in noise (B = -0.07; 95% CI: -0.14-[-0.01], P = .024). No other significant associations between datalogging output and each proxy SES factor were found. Lack of private insurance and older age at implantation decreased access to binaural hearing for children and young adults with cochlear implants.

Rebuilding child health in South Kivu, Democratic Republic of Congo (DRC): evaluating the Asili social enterprise program

BackgroundThe Democratic Republic of Congo (DRC) has a long history of conflict and ongoing local instability; the eastern provinces, including South Kivu, have been especially affected. Health systems and livelihoods have been undermined, contributing to massive inequities in access to health services and high rates of internal displacement. Asili, an innovative social enterprise program, aimed to provide essential community services and improve the health of under-five children in two South Kivu communities, Mudaka and Panzi, via provision of small-format, franchisable health clinics and clean water services.MethodsWe evaluated utilization and acceptance of Asili services in two study sites, Mudaka and Panzi. Data collected included questions on housing conditions, food security, and at follow up, Asili membership and use, satisfaction with services, and recommendations for improvement. Structured pre- and post-interviews with primary caregivers of families with under-five children were the primary source of data with additional community input collected through focus group discussions.ResultsAt baseline, we enrolled 843 households in Mudaka and 890 in Panzi. Market segmentation analysis illuminated service usage patterns, showing Asili services were well received overall in both Mudaka and Panzi. Families reporting higher levels of proxy measures of socioeconomic status (SES), such as electricity, land ownership, and education, were more likely to use Asili services, findings that were further supported by focus group discussions among community members.ConclusionsRebuilding health infrastructure in post-conflict settings, especially those that continue to be conflict-affected and very low SES, is a challenging prospect. Focus group results for this study highlighted the positive community response to Asili, while also underscoring challenges related to cost of services. Programs may need, in particular, to have different levels of costs for different SES groups. Additionally, longer follow-up periods and increased stability may be needed to assess the potential of social enterprise interventions such as Asili to improve health outcomes, especially in children.Trial registrationInstitutional Review Board approval for this study was obtained at Stanford University (IRB 35216) and the University of Kinshasa, DRC. Further, this study has been registered on Clinicaltrials.gov (record NCT03536286), retrospectively registered as of 4/23/2018.

Do Global Adolescents With Food Insecurity Feel Lonely?

As a proxy measure of socioeconomic status, food insecurity is understudied in mental health-related research. This study aimed to explore the association between food insecurity and loneliness in adolescents. Using cross-sectional data from the Global Student Health Survey (GSHS), 164,993 adolescent participants were included in this study. Food insecurity, loneliness, and other covariates were assessed by self-reported questionnaire. Multivariable logistics regression considering complex survey was used to explore the association between food insecurity and loneliness. The prevalence of loneliness was 10.8% in adolescents. With higher levels of food insecurity, the prevalence of loneliness in general increased, but “most of the time” was the most frequently reported item in terms of food insecurity. Adolescents who reported severe food insecurity had significantly greater odds for loneliness: (1) being most of the time [odd ratio (OR) = 2.54, 95% CI = 2.13–3.02]; (2) always hungry (OR = 1.97, 95% CI = 1.55–2.51). Of all the 53 countries, adolescents from 39 countries reported significantly higher prevalence of loneliness when exposed to food insecurity. The pooled OR was 1.74 (1.60–1.89) with a negligible heterogeneity (higher I-squared was 34.2%). Adolescents with food insecurity were more likely to be exposed to be lonely. Eliminating socioeconomic disparities in adolescents might be a good approach to promote mental health in adolescents. Future studies are encouraged to utilize longitudinal studies to confirm or negate our study findings.

Disadvantaged Americans are suffering the brunt of rising pain and physical limitations.

Using data from three national surveys of US adults (one cohort and two cross-sectional studies, covering the period from the mid-1990s to the mid-2010s), we quantify the degree to which disparities by socioeconomic status (SES) in self-reported pain and physical limitations widened and explore whether they widened more in midlife than in later life. Unlike most prior studies that use proxy measures of SES (e.g., education), we use a multidimensional measure of SES that enables us to evaluate changes over time in each outcome for fixed percentiles of the population, thereby avoiding the problem of lagged selection bias. Results across multiple datasets demonstrate that socioeconomic disparities in pain and physical limitations consistently widened since the late 1990s, and if anything, widened even more in midlife than in late life (above 75). For those aged 50-74, the SES disparities in most outcomes widened by more than 50% and in some cases, the SES gap more than doubled. In contrast, the magnitude of SES widening was much smaller above age 75 and, in the vast majority of cases, not significant. Pain prevalence increased at all levels of SES, but disadvantaged Americans suffered the largest increases. Physical function deteriorated for those with low SES, but there was little change and perhaps improvement among the most advantaged Americans. At the 10th percentile of SES, the predicted percentage with a physical limitation at age 50 increased by 6-10 points between the late-1990s and the 2010s, whereas at the 90th percentile of SES, there was no change in two surveys and in the third survey, the corresponding percentage declined from 31% in 1996-99 to 22% in 2016-18. The worst-off Americans are being left behind in a sea of pain and physical infirmity, which may have dire consequences for their quality of life and for society as a whole (e.g., lost productivity, public costs).

Evaluation of Neighborhood Socio-Economic Status, as Measured by the Delphi Method, on Dengue Fever Distribution in Jeddah City, Saudi Arabia.

Dengue fever, a mosquito-transmitted viral disease, is present in many neighborhoods in Jeddah City, Saudi Arabia. One factor likely to affect its distribution is the socio-economic status of local neighborhoods; however, the absence of socio-economic census data in Saudi Arabia has precluded detailed investigation. This study aims to develop a proxy measure of socio-economic status in Jeddah City in order to assess its relationship with the occurrence of dengue fever. The Delphi method was used to assess the socio-economic status (high, medium or low) of local neighborhoods in Jeddah City. A Geographic Information System (GIS) was applied to understand the distribution of dengue fever according to the socio-economic status of Jeddah City neighborhoods. Low-socio-economic status neighborhoods in south Jeddah City, with poor environmental conditions and high levels of poverty and population density, reported most cases of dengue fever. Nevertheless, dengue continues to increase in high socio-economic status neighborhoods in the northern part of the city, possibly due to ideal breeding conditions caused by the presence of standing water associated with high levels of construction. Moreover, the low-socioeconomic-status neighborhoods had the highest average number of cases, being 3.95 times that of high-status neighborhoods for the period 2006–2009. The Delphi approach can produce a useful and robust measure of socio-economic status for use in the analysis of patterns of dengue fever. Results suggest that there are nuances in the relationship between socio-economic status and dengue that indicate that higher status areas are also at risk. A useful additional tool for researchers in Saudi Arabia would be the development of census data or other systematic measures that allow socio-economic status to be included in spatial analyses of dengue fever and other diseases.

ER Use among Older Adult RHC Medicare Beneficiaries in the Southeastern United States.

This study analyzed individual factors of race and dual eligibility on emergency room (ER) utilization of older adult Medicare patients treated by RHCs in CMS Region 4. A prospective, longitudinal design was employed to analyze health disparities that potentially exist among RHC Medicare beneficiary patients (+65) in terms of ER use. The years of investigation were 2010 through 2012, using mixed multilevel, binary logistic regression. This study found that dual eligible RHC patients utilized ER services at higher rates than non-dual eligible, Medicare only RHC patients at: 77%, 80%, and 66%, in 2010, 2011, and 2012, respectively; and above the White reference group, Black RHC Medicare patients utilized ER services at higher rates of: 18%, 20%, and 34%, in 2010, 2011, and 2012, respectively. Regarding limitations, cohort data observations within the window of 3 years were only analyzed; regarding generalizability, in different CMS regions, results will likely vary; and linking other variables together in the study was limited by the accessible data. Future research should consider these limitations, and attempt to refine. The findings support that dual Medicare and Medicaid eligibility, as a proxy measure of socio-economic status, and race continue to influence higher rates of ER utilization in CMS Region 4. In terms of ER utilization disparities, persistently, as recent as 2012, Black, dual eligible RHC Medicare beneficiary patients age 65 and over may be twice as likely to utilize ER services for care than their counterparts in the Southeastern United States.

A geostatistical study of socioeconomic status (SES), rurality, seasonality and index test results as drivers of free private groundwater testing in southern Ontario, 2012–2016

Approximately 12% of the Canadian population uses private wells for daily water consumption; however, well water testing rates are on the decline, resulting in an increased risk of waterborne acute gastrointestinal illness. To date, limited research has explored the determinants influencing well testing practices. Accordingly, the current study sought to investigate the drivers of “one-off” and repeat well water testing in southern Ontario during the 5-year period 2012–2016, using the worlds largest private groundwater testing data-frame. Data from >400,000 wells were geospatially integrated with all tests conducted by the provincial laboratory in southern Ontario. The Ontario Marginalization Index (ON-Marg) was used as a proxy measure of socioeconomic status (SES), with rurality, based on population density, season, and index (1st) test results assessed as effect modifiers. Multivariate analysis was undertaken using log-binomial regression. Approximately 27.5% of wells (n = 417,406) were tested during the study period, 66.7% of which were sampled more than once; 3% of all samples tested positive for E. coli (>0 colony forming unit/100 mL). In rural regions (<150 people/km2), wells located in low SES areas were 13% more likely to be tested compared to high SES areas (95% CI: 1.11, 1.15). In urban (>400 people/km2) and peri-urban regions (>150 and <400 people/km2), wells located in low SES areas were 14% (95% CI: 0.78, 0.95) and 15% (95% CI: 0.76, 0.94) less likely to be tested compared to high SES areas. Wells located in low SES areas were 6% more likely to be re-tested (95% CI: 1.04, 1.07). Positive index tests were associated with a 17% increased likelihood of repeat testing (95% CI: 1.16, 1.18). Accordingly, the authors conclude that location and SES are significant predictors of well water testing, with index test status being the most influential predictor of repeat well testing.

Socio-Economic Differences in Early Initiation of Breastfeeding Among Children in a Ugandan Cross-Sectional Study

Early initiation of breastfeeding reduces neonatal and maternal morbidity and mortality, enhances mother-infant dyad bonding and maternal optimal breastfeeding practices. Studies on socio-economic inequalities in early initiation of breastfeeding are sparse in Uganda. This study therefore aimed to examine the association between socio-economic status and early initiation of breastfeeding among 5504 children aged 0-23 months in a country-wide population based cross-sectional study. Early initiation of breastfeeding defined as initiation of breastfeeding within an hour of birth was the outcome of interest. Proxy measures of socio-economic status (maternal occupation and household wealth index) were the exposure variable of interest. Bivariate analysis was conducted to determine the distribution of the prevalence of early initiation of breastfeeding by infant-mother dyad characteristics. Multivariate binary logistic regression models adjusted for relevant confounders were fitted to examine the association between socio-economic status and early initiation of breastfeeding. The results showed an overall prevalence early initiation of breastfeeding of 67.8% among Ugandan children. Children whose mothers self-reported their occupation as farmers and skilled manual workers had lower odds of early initiation of breastfeeding compared to those whose mothers were doing professional/technical/managerial work; OR: 0.69 (0.51 - 0.95) and 0.70 (0.49 - 0.99) respectively. On the other hand, children that lived in the poorest and poorer households had lower odds of early initiation of breastfeeding OR: 0.46 (0.32-0.67) and 0.64 (0.43-0.94) respectively. In conclusion, we found individual and household socio-economic inequality in EIB among children less than two years of age. Targeting interventions for promotion of EIB to less affluent mother-child dyads and households might be important in increasing optimal breastfeeding practices.

Socio-Economic Status and Exclusive Breastfeeding Among Infants in a Ugandan Cross-Sectional Study

Nation-wide population based studies on socio-economic inequality in exclusive breastfeeding among infants is scarce in Uganda. This study examined the socio-economic inequality in exclusive breastfeeding among 1424 infants below 6 months of age in a nation-wide population based cross-sectional study. Self-reported maternal exclusive breastfeeding practice in the first six months of their last born baby`s life was the outcome of interest. Household wealth index and maternal occupation constituted the proxy measures of socio-economic status, the exposure variable of interest. The distribution of exclusive breastfeeding practice by infant-mother dyad characteristics was calculated by conducting bivariate analysis. Multivariate binary logistic regression models were then fitted to calculate the odds ratios and their corresponding 95% confidence intervals for exclusive breastfeeding by maternal occupation and household wealth index. The results showed that half of the infants were boys, close to half of their mothers were farmers, and 23% and 16.9% of the infants lived in the poorest and richest households respectively. Overall 67% of the infants were exclusively breastfed. The odds ratios for exclusive breastfeeding by maternal occupation were 0.62 (0.26-1.50) for infants whose mothers were professionals/technical/managers, 0.97(0.50-1.87) for clerical/sales, 0.78 (0.51-1.21), for Farmers, 0.72 (0.29-1.82) for Household/Domestic/Services, 0.72 (0.39-1.36) for skilled manual workers and 0.72 (0.25-2.02) for unskilled manual workers compared to infants of non-working mothers. The odds ratios for exclusive breastfeeding by household wealth index were 2.38 (1.30-4.33), for the poorest, 2.16 (1.18-3.96) poorer, 1.91 (1.10-3.48) middle, and 1.41 (0.75-2.64), for richer households compared to infants in the richest households. In conclusion, an inverse relationship was found between household socio-economic status and exclusive breastfeeding among infants below six months of age and inadequate evidence to conclude existence of an association between maternal socio-economic status and exclusive breastfeeding. Targeting exclusive breastfeeding interventions to mother-infant dyad living in affluent families might be important in reducing socio-economic inequality in exclusive breastfeeding among infants below six months of age in Uganda.

The impact of prematurity and maternal socioeconomic status and education level on achievement-test scores up to 8th grade.

BackgroundThe relative influence of prematurity vs. maternal social factors (socioeconomic status and education level) on academic performance has rarely been examined.ObjectiveTo examine the impact of prematurity and maternal social factors on academic performance from 3rd through 8th grade.MethodsWe conducted a retrospective cohort study of infants born in 1998 at the University of Arkansas for Medical Sciences. The study sample included 58 extremely low gestational age newborns (ELGANs, 23‒<28 weeks), 171 preterm (≥28‒<34 weeks), 228 late preterm (≥34‒<37 weeks), and 967 term ((≥37‒<42 weeks) infants. Neonatal and maternal variables were collected including maternal insurance status (proxy measure for socioeconomic status) and education level. The primary outcomes were literacy and mathematics achievement-test scores from 3rd through 8th grade. Linear mixed models were used to identify significant predictors of academic performance. All two-way interactions between grade level, gestational-age (GA) groups, and social factors were tested for statistical significance.ResultsPrematurity, social factors, gender, race, gravidity, and Apgar score at one minute were critical determinants of academic performance. Favorable social factors were associated with a significant increase in both literacy and mathematic scores, while prematurity was associated with a significant decrease in mathematic scores. Examination of GA categories and social factors interaction suggested that the impact of social factors on test scores was similar for all GA groups. Furthermore, the impact of social factors varied from grade to grade for literacy, while the influence of either GA groups or social factors was constant across grades for mathematics. For example, an ELGAN with favorable social factors had a predicted literacy score 104.1 (P <.001), 98.2 (P <.001), and 76.4 (P <.01) points higher than an otherwise similar disadvantaged term infant at grades 3, 5, and 8, respectively. The difference in their predicted mathematic scores was 33.4 points for all grades (P <.05).ConclusionWhile there were significant deficits in academic performance for ELGANs compared to PT, LPT, and term infants, the deficit could be offset by higher SES and better-educated mothers. These favorable social factors were critical to a child’s academic achievement. The role of socioeconomic factors should be incorporated in discussions on outcome with families of preterm infants.

Are pension types associated with happiness in Japanese older people?: JAGES cross-sectional study.

BackgroundAlthough many previous studies have examined the determinants of happiness in older adults, few have investigated the association between pension types and happiness. When compared to other conventional socioeconomic indicators, pension types may be more indicative of long-term socioeconomic status as they can reflect a person’s job history over their life course. This study examined the association between pension types and happiness in Japanese older people.MethodsCross-sectional survey data from the Japan Gerontological Evaluation Study were used to analyze the association between pension types and happiness. The study population comprised 120152 participants from 2013. We calculated the prevalence ratios of happiness for the different pension types using Poisson regression models that controlled for age, sex, marital status, equivalent income, wealth, education level, working status, occupation, depression, and social support.ResultsAfter controlling for socioeconomic indicators, the prevalence ratios (95% confidence intervals) of happiness for no pension benefits, low pension benefits, and moderate pension benefits relative to high pension benefits were 0.77 (0.73–0.81), 0.95 (0.94–0.97), and 0.98 (0.97–0.99), respectively. However, the inclusion of depression as a covariate weakened the association between pension types and happiness.ConclusionsWhile pension types were associated with happiness after adjusting for other proxy measures of socioeconomic status, the association diminished following adjustment for depression. Pension types may provide rich information on socioeconomic status and depression throughout the course of life. In addition to conventional socioeconomic indicators, pension types should also be considered when assessing the determinants of happiness in older adults.

Inequity in access to inpatient healthcare services for non-communicable diseases in India and the role of out-of-pocket payments.

Growing evidence suggests that non-communicable diseases (NCDs) result in considerable economic burden for individuals and households. With the poor facing a greater burden of NCDs than the rich in India, we undertook this study to analyse the horizontal equity in utilization and vertical equity in out-of-pocket expenditure for NCD care. We used data of 1 4 large Indian states from the National Sample Survey 60th round to compute hospitalization rates for NCDs. Mean per capita consumption expenditure (MPCE) was computed and used as a proxy measure for socioeconomic status. Out-of-pocket payment as a proportion of MPCE was estimated by wealth quintile (Q) to assess the vertical equity in payments. Concentration index (CoI) was computed to measure the extent of equity, and its 95% confidence interval was estimated to assess statistical significance. Overall, NCD hospitalizations in public facilities in India were used more by the poor (Col -0.041 ), while the rich used proportionately more services in the private sector (CoI 0.174). Out-of-pocket expenditure in public facilities was consistently lower than that in private facilities in urban and rural areas. The mean out-of-pocket expenditure for inpatient services for NCDs was found to be more among the rich in both public (Q5 ₹13 016, Q1 ₹4197) and private (Q5 ₹22 974, Q1 ₹8225) facilities. Public facilities are utilized more by poorer individuals. Strengthening the capacity of the public sector to deliver NCD care is required to meet equitable outcomes.

Parental smoking during pregnancy shortens offspring's legs

One of the most severe detrimental environmental factors acting during pregnancy is foetal smoke exposure. The aim of this study was to assess the effect of maternal, paternal and parental smoking during pregnancy on relative leg length in 7- to 10-year-old children. The research conducted in the years 2001–2002 included 978 term-born children, 348 boys and 630 girls, at the age of 7–10 years. Information concerning the birth weight of a child was obtained from the health records of the women. Information about the mother's and the father's smoking habits during pregnancy and about the mothers’ education level was obtained from a questionnaire. The influence of parental smoking on relative leg length, controlled for age, sex, birth weight and the mother's education, as a proxy measure of socioeconomic status, and controlled for an interaction between sex and birth weight, was assessed by an analysis of covariance, where relative leg length was the dependent variable, smoking and sex were the independent variables, and birth weight as well as the mother's education were the covariates. Three separate analyses were run for the three models of smoking habits during pregnancy: the mother's smoking, the father's smoking and both parents’ smoking. Only both parents’ smoking showed a significant effect on relative leg length of offspring. It is probable that foetal hypoxia caused by carbon monoxide contained in smoke decelerated the growth of the long bones of foetuses.

Socioeconomic status of emergency department users in Ontario, 2003 to 2009.

Emergency department (ED) overcrowding in Canada is an ongoing problem resulting in prolonged wait times, service declines, increased patient suffering, and adverse patient outcomes. We explored the relationship between socioeconomic status (SES) and ED use in Canada's universal health care system to improve our understanding of the nature of ED users to both improve health care to the most deprived populations and reduce ED patient input. This retrospective study took information from the National Ambulatory Care Reporting System (NACRS) database for all ED visits in Ontario between April 1, 2003, and March 31, 2010. As there is no direct measure of SES available from ED visit records, a proxy measure of SES was used, namely a deprivation index (DI) developed from material and social factors from the 2006 Canadian census using the patient's residential neighbourhood. DI scores were assigned to ED visit records using Statistics Canada's Postal Code Conversion File, which links postal and census geography. A total of 36,765,189 visits occurred during the study period. A cross-province trend was found wherein the most deprived population used EDs disproportionately more than the least deprived population (relative risk: 1.971 95% confidence interval 1.969-1.973, p < 0.0001). This trend was stable across the entire study period, although the divergence is attenuating. Social determinants of health clearly impact ED use patterns. People of the lowest SES use ED services disproportionately more than other socioeconomic groups. Focused health system planning and policy development directed at optimizing health services for the lowest SES populations are essential to changing ED use patterns and may be one method of decreasing ED overcrowding.

Parental Education Level Is Associated With Clustering of Metabolic Risk Factors in Adolescents Independently of Cardiorespiratory Fitness, Adherence to the Mediterranean Diet, or Pubertal Stage

Few studies have reported associations between clustering metabolic risk factors and socioeconomic status (SES) in youth. This study aimed to analyze the association between clustering metabolic risk factors and SES in adolescents. It was hypothesized that SES is inversely related to clustering metabolic risk factors. This 2009 cross-sectional school-based study investigated 517 Portuguese adolescents ages 15-18 years. The study considered the age- and sex-adjusted z-scores for the ratio of total cholesterol/high-density lipoprotein, homeostasis model, triglycerides, and systolic blood pressure, and a metabolic risk score was constructed by summing all the z-scores (≥1 standard deviation was considered high risk). Cardiorespiratory fitness was estimated by the 20 m shuttle-run test and dietary intake by a food frequency questionnaire. The best of parental education was used as a proxy measure of SES. The results showed that adolescents with low SES were more likely to have a high metabolic risk score (odds ratio [OR], 1.96; p < 0.020) regardless of cardiorespiratory fitness, adherence to the Mediterranean diet, or pubertal stage. In conclusion, a lower SES was associated with increased risk for a high metabolic risk score among Azorean adolescents after adjustment for pubertal stage, adherence to the Mediterranean diet, and cardiorespiratory fitness. Future health-promotion strategies among Azorean adolescents should consider the impact of SES on their health.

Association of Income Level With Kidney Disease Severity and Progression Among Children and Adolescents With CKD: A Report From the Chronic Kidney Disease in Children (CKiD) Study

Among adults, lower socioeconomic status (SES) is a risk factor for chronic kidney disease (CKD), progression to end-stage renal disease, and poor health outcomes; but its impact on young people with CKD is not established. Prospective cohort study. 572 children and adolescents aged 1-16 years with mild to moderate CKD residing in the United States and Canada who were enrolled in the Chronic Kidney Disease in Children (CKiD) Study. Self-reported annual household income category as a proxy measure for SES: ≥$75,000 (high income), $30,000 to <$75,000 (middle income) and <$30,000 (low income). Clinical characteristics and CKD severity at baseline (glomerular filtration rate [GFR] and comorbid conditions related to disease severity and management) and longitudinally (GFR decline and changes in blood pressure z scores and height z scores per year). At baseline, low and middle household incomes, compared to high income, were associated with minority race (39% and 20% vs. 7%), lower maternal education (28% and 5% vs. 1%), abnormal birth history (34% and 32% vs. 21%), and having at least one clinical comorbid condition (66% and 64% vs. 55%). Baseline median GFRs were similar across income categories (43-45 mL/min/1.73 m2). After adjusting for baseline differences, average GFR declines per year for the low-, middle-, and high-income categories were -2.3%, -2.7%, and -1.9%, respectively, and were not statistically significantly different among groups. Blood pressure control tended to improve in all groups (z score, -0.10 to -0.04) but higher income was associated with a faster improvement. Each group showed similar deficits in height at baseline. Height deficits diminished over time for participants from high-income families, but not among those from low-income families (z scores for height per year, 0.05 and -0.004, respectively; P = 0.03 for comparison of high and low income). Income is an imperfect measure for SES; CKiD participants are not representative of children and adolescents with CKD who are uninsured or not receiving care; statistical power to detect associations by income level is limited. GFR decline was similar across income groups but better improvement in BP was observed among those with high income. Children and adolescents with CKD from lower income households are at higher risk of impaired growth.

Glasgow smiles better: An examination of adolescent mental well-being and the ‘Glasgow effect’

The existence of a negative 'Glasgow effect' on health has been much disputed. Previously, Glasgow's poor health was believed to be due to high levels of poverty. However, more recent studies investigating adult health outcomes have shown an effect over and above that of deprivation. To examine the existence of a 'Glasgow effect' on mental well-being and subjective health of an adolescent sample. Data from the 2006 Health Behaviour in School-Aged Children cross-sectional survey were analyzed. Data were modelled using multilevel logistic and linear modelling for the following outcomes: happiness, confidence, feeling left out, self-rated health, multiple health complaints (MHC), life satisfaction and health-related quality of life (KIDSCREEN-10). The models were further adjusted for family affluence and family status, as proxy measures of socio-economic status. The proportions of pupils that reported being very happy, always confident and never left out were greater among pupils in Glasgow compared with pupils in the rest of Scotland, as were mean life satisfaction and KIDSCREEN scores. Frequencies of MHC and subjective health were not significantly different in Glasgow compared with the rest of Scotland. Similar results were observed following the modelling procedures, adjusting for age, sex, grade and school type (state or independent), for all outcomes other than life satisfaction, and effect sizes increased further after adjustment for family affluence and family status. The odds of a pupil in Glasgow being very happy, for example, were 1.48 [credible interval (CI) 1.19-1.83] those of a pupil outside Glasgow. After adjustment for family affluence and family status, the odds were 1.59 (CI 1.28-1.98). An interaction term between Glasgow and grade was not significant for all mental well-being outcomes, although there was some suggestion that a negative Glasgow effect on self-rated health is emerging by Secondary 4. The Glasgow effect may not be all bad. The findings suggest that mental well-being is more prevalent in Glasgow compared with the rest of Scotland during adolescence. Further research is recommended to investigate the Glasgow effect during this life stage.