Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Census Methods”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 1,261 records · Page 70Linked to original sources

Direct observation of neighborhood attributes in an urban area of the US south: characterizing the social context of pregnancy.

BACKGROUND: Neighborhood characteristics have been associated with poor maternal and child health outcomes, yet conceptualization of potential mechanisms is still needed. Census data have long served as proxies for area level socioeconomic influences. Unique information captured by neighborhood inventories, mostly conducted in northern US and Canadian urban areas, has shown important aspects of the community environment that are not captured by the socioeconomic and demographic aggregated individual statistics of census data. In this paper, we describe a neighborhood data collection effort tailored to a southern urban area. METHODS: This study used data from the Pregnancy, Nutrition and Infection (PIN) prospective cohort study to describe neighborhoods where low- and moderate-income pregnant women reside. Women who participated in the PIN study and who resided in Raleigh, NC and its surrounding suburbs were included (n = 703). Neighborhood attributes captured by the inventory included litter, housing condition, road condition, and social interactions that informed theoretical constructs of physical incivility, territoriality and social spaces. US Housing and Population Census 2000 data at the block group level were also assessed to identify the unique contribution of directly observed data. We hypothesize that neighborhood environments can influence health through psychosocial mediated pathways that lead to increased stress, or through disadvantage leading to poor neighborhood resources, or by protective attributes through increased social control. RESULTS: Findings suggest that directly observed neighborhood attributes distinguished between different types of areas in which low-income pregnant non-Hispanic white and non-Hispanic black women lived. Theoretically informed scales of physical incivilities, territoriality and social spaces were constructed and found to be internally consistent. Scales were weakly associated indicating that these constructs capture distinct information about these neighborhoods. Physical incivilities, territoriality and social spaces scales were poorly explained by traditional census variables used to proxy neighborhood environment. CONCLUSION: If neighborhoods influence health through psychosocial mediated pathways then careful detailing of neighborhood attributes that contribute to stress or deterioration, beyond traditional socioeconomic status, are needed. We believe that measuring physical incivility, territoriality and social spaces as expressions of underlying issues of maintenance and social communication make important contributes to this field.

Adolescent↗

Census error and the detection of density dependence.

1. Studies aiming to identify the prevalence and nature of density dependence in ecological populations have often used statistical analysis of ecological time-series of population counts. Such time-series are also being used increasingly to parameterize models that may be used in population management. 2. If time-series contain measurement errors, tests that rely on detecting a negative relationship between log population change and population size are biased and prone to spuriously detecting density dependence (Type I error). This is because the measurement error in density for a given year appears in the corresponding change in population density, with equal magnitude but opposite sign. 3. This effect introduces bias that may invalidate comparisons of ecological data with density-independent time-series. Unless census error can be accounted for, time-series may appear to show strongly density-dependent dynamics, even though the density-dependent signal may in reality be weak or absent. 4. We distinguish two forms of census error, both of which have serious consequences for detecting density dependence. 5. First, estimates of population density are based rarely on exact counts, but on samples. Hence there exists sampling error, with the level of error depending on the method employed and the number of replicates on which the population estimate is based. 6. Secondly, the group of organisms measured is often not a truly self-contained population, but part of a wider ecological population, defined in terms of location or behaviour. Consequently, the subpopulation studied may effectively be a sample of the population and spurious density dependence may be detected in the dynamics of a single subpopulation. In this case, density dependence is detected erroneously, even if numbers within the subpopulation are censused without sampling error. 7. In order to illustrate how process variation and measurement error may be distinguished we review data sets (counts of numbers of birds by single observers) for which both census error and long-term variance in population density can be estimated. 8. Tests for density dependence need to obviate the problem that measured population sizes are typically estimates rather than exact counts. It is possible that in some cases it may be possible to test for density dependence in the presence of unknown levels of census error, for example by uncovering nonlinearities in the density response. However, it seems likely that these may lack power compared with analyses that are able to explicitly include census error and we review some recently developed methods.

Animals↗

The increasing workload of general surgery.

BACKGROUND: With the aging of the baby boomers, individuals aged 65 years and older make up the fastest-growing segment of the US population. This aging of the population will lead to new challenges for the US health care system because older individuals are the largest consumers of health care. HYPOTHESIS: The general surgery workload will increase dramatically by 2020 as a result of the aging population. DATA SOURCES: The National Hospital Discharge Survey, National Survey of Ambulatory Surgery, US Census Bureau, and Centers for Medicare and Medicaid Services. SETTING: A nationally representative random sample of inpatient and outpatient general surgical operations performed in 1996 in the United States. METHODS: Age- and procedure-specific rates of general surgery were obtained from the National Hospital Discharge Survey and National Survey of Ambulatory Surgery. Population projections were derived from the census bureau. We used relative-value units as a proxy for surgical work. By linking these 3 data sources, we predicted the future general surgery workload by analyzing the rates of surgery and modeling both the aging and expansion of the population. RESULTS: General surgery operations (n = 63) were classified into 5 procedure categories. Whereas the population will grow by 18% between 2000 and 2020, the workload of general surgeons will increase by 31.5%. The amount of growth (19.9%-40.3%) varies among different categories of operations. CONCLUSIONS: To our knowledge, this is one of the only studies to analyze the future workload of general surgery. We project a dramatic increase in workload in the next 20 years, largely as a result of the aging US population. Our baseline assumptions are relatively conservative, so this forecast may be an underestimation. Hence, the challenge for general surgeons is to develop strategies to address this problem while maintaining quality of care for our patients.

Adolescent↗

Spatial partitioning using multivariate cluster analysis and a contiguity algorithm.

Spatial analysis of epidemiological data can be a useful tool for identifying patterns of disease occurrence and can provide substantial support for prevention and control strategies. To obtain the greatest spatial resolution, it is important to use the smallest available areal units with homogeneous population. However, small areas usually have a small population, introducing spurious variability in the chosen indicators of disease occurrence. This paper describes an approach for combining small geographical units to stabilize mortality rates by pooling information across areas according to specified risk profiles. The procedure is based on a principal component analysis, followed by a cluster analysis of social-economic indicators to classify the risk profile of each small area. The classification is used in an algorithm to join neighbouring areas with similar profiles until an estimated population size is achieved. We applied this method to two Administrative Regions of the city of Rio de Janeiro, Brazil, using the census tracts as the basic areal unit. Census tracts were classified according to four socioeconomic categories distributed spatially as a mosaic, where tracts of differing categories neighbour each other. The aggregation algorithm produced a new partition of the region studied, with the created areal units preserving the internal socioeconomic homogeneity.

Adult↗

Annuitizing the human capital investment costs of health service professionals.

When evaluating initiatives that make innovative uses of staff it is important to consider the long-term cost consequences of training an appropriately qualified workforce. In order to incorporate the costs of qualifying professionals we need both the costs themselves and an appropriate method of annuitizing these costs. This paper focuses on the latter and describes an approach to estimating the expected working life of health service professionals and a method of annuitization that takes into consideration patterns of employment over time. Analyses of the census and Labour Force Survey result in estimates of expected working lives of between 19 and 22 years for nurses and 26 and 29 years for doctors. The implications of different assumptions about the distribution of these years for the equivalent annual cost are identified.

Adult↗

Socioeconomic and demographic disparities in treatment for carcinomas of the colon and rectum.

BACKGROUND: The current study examined the relationship between socioeconomic and demographic factors and type of treatment for carcinomas of the colon and rectum. The National Institutes of Health and the National Cancer Institute recommend surgery followed by adjuvant chemo- and/or radiotherapy for Stage III colon and Stages II and III rectal carcinomas. METHODS: The authors linked Washington State's cancer registry and hospital discharge records and U.S. census data to assess socioeconomic and demographic factors related to treatment, controlling for clinical factors. RESULTS: Compared to colon carcinoma patients under age 65 years, patients aged 75-84 years and 85 years or older were at higher risk for a treatment plan of surgery without adjuvant therapy (adjusted odds ratio [OR] = 2.5, 95% confidence interval [CI] = 1.3-4.7; OR = 14.1, CI = 6.3-31.4, respectively). Risk of no adjuvant therapy was more than doubled for patients in zip codes in the lowest quartile of per capita income compared to the top three quartiles (OR = 2.3, CI = 1.5-3.4) and for those with Medicare compared to private insurance (OR = 2.2, CI = 1.3-3.8). Older patients with rectal carcinoma were also at higher risk of a treatment plan that did not include adjuvant therapy. CONCLUSIONS: The current findings suggest disparities in the provision of recommended medical procedures related to socioeconomic and demographic factors.

Adult↗

Cancer information service-initiated outcalls to promote screening mammography among low-income and minority women: design and feasibility testing.

BACKGROUND: The telephone information service of the Cancer Information Service (CIS) historically is most effective in eliciting calls from higher income, white women. This article describes the design and feasibility of a project that tested the use of telephone outcalls to extend the reach of the telephone information service to underserved women. METHODS: Neighborhoods throughout Colorado were identified using a geodemographic database (INFORUM) that allowed selection of census block groups according to demographic characteristics. Households were assigned randomly to: (1) a control group; (2) an outcall-only group, which received "cold" telephone outcalls promoting screening mammography; and (3) an advance card plus outcall group, which received a card introducing the program prior to the outcall. RESULTS: The use of INFORUM to target low-income, less educated, and black women was largely successful. While quality of intervention delivery was high, the protocol was labor intensive, requiring an average of 40 min to identify and counsel each eligible woman. The advance card did not increase acceptance of the outcalls. CONCLUSIONS: This approach successfully extended the CIS's audience; however, its labor intensity may limit its applicability. Strategies for increasing the efficiency of outcall efforts are suggested.

Aged↗

Stress urinary incontinence surgery in the United States.

OBJECTIVE: To describe the prevalence, regional rates and demographic characteristics, morbidity, and mortality of stress urinary incontinence surgeries in the United States. METHODS: We used data from the 1998 National Hospital Discharge Survey and the 1998 National Census to calculate rates of surgeries for stress urinary incontinence by age, race, and region of the United States. From these data we estimated morbidity and mortality associated with incontinence surgery. RESULTS: In 1998, approximately 135000 women had inpatient surgery for stress urinary incontinence in the United States. The mean age of these women was 54.0 (+/-13.3) years. The South had the highest rate of surgery (14.8 per 10000 women), whereas the Northeast had the lowest (9.8 per 10000). In the 79% of discharges for which race was stated, the surgery rate for whites (11.6 per 10000) was almost five times greater than for blacks (2.6 per 10000), whereas the perioperative complication rate for blacks was twice that for whites (20.6% compared with 9.7%). Almost 70% of incontinence surgeries were done in combination with other major gynecologic procedures. For all incontinence surgeries, approximately 18% had complications, and mortality was rare (0.01%). CONCLUSION: Stress urinary incontinence surgery is common, especially among white women. Differences in regional and racial surgical rates may represent differences in physician practice, patient expectations, and access to or utilization of care.

Adult↗

HIV trends in African blood donors.

OBJECTIVES: To assess trends over the last 12 years in HIV-1/HIV-2 seroprevalence among blood donors in African nations and to correlate trends with national AIDS policies, with the purpose of preventing future cases. METHODS: Using collated data of African seroepidemiologic studies published by the U.S. Bureau of the Census, we established a best-fit linear trend, determined by regression analysis of HIV-1 and HIV-2 seroprevalence values for African blood donors against time, with adjustments for sample size of reported studies. RESULTS: Among 38 nations with sufficient data, 11 showed increases in HIV-1 seroprevalence, six showed decreases and 21 showed no significant changes. Decreases were seen primarily in nations with a high HIV-1 seroprevalence before 1989 (P<0.001, Chi-square). HIV-2 seroprevalence decreased in all nations where it was tested except Nigeria. There was a moderate correlation between decreases in HIV-1 and HIV-2 seroprevalence values (correlation coefficient = 0.39). No significant correlations between HIV policies and subsequent HIV-1 seroprevalence trends among blood donors and HIV patients were detected. CONCLUSIONS: A great disparity exists in trends in HIV-1 seroprevalence among African nations. HIV-2 seroprevalence is consistently decreasing throughout most of West Africa, the exception being Nigeria. The absence of any significant correlation between HIV seroprevalence trends and healthcare policies suggests that other factors are more influential than national policy in determining such trends and, by extrapolation, trends in AIDS prevalence.

Africa↗

[Health inequalities in Panama].

OBJECTIVES: To document socioeconomic inequalities in health and health services in Panama and thus create a baseline for the prospective monitoring of the impact of health policies on equity. METHODS: Analysis of data from the 1997 Living Standards Measurement Survey, the 1990 National Population Census and birth registration data for 1996. The relative index of inequality and concentration coefficient were calculated for a wide range of indicators of out-of-pocket health expenditure, access, utilization and quality of health services and of health outcomes. RESULTS: Large and statistically significant socioeconomic differences in many of the variables examined were detected, almost all of which favored the rich. The inequalities identified included qualitative factors such as the type of care received as well as quantitative factors such as travelling times and utilization rates. Some of the inequalities were concentrated among a small, very poor segment of the population whilst others were the result of gradually increasing advantage with increased levels of outcome. CONCLUSIONS: The results obtained provide a valuable starting point for the Panamanian government from which it can identify the most serious inequalities in health and health service provision and develop policies to eliminate or reduce them. They also offer a baseline to monitor changes in the magnitude of these inequalities over time.

Delivery of Health Care↗

Twenty-two year (1975 to 1997) trends in the incidence, in-hospital and long-term case fatality rates from initial Q-wave and non-Q-wave myocardial infarction: a multi-hospital, community-wide perspective.

OBJECTIVES: The goal of this study was to examine long-term trends in the incidence, in-hospital and long-term mortality patterns in patients with an initial non-Q-wave myocardial infarction (NQWMI) as compared with those with an initial Q-wave myocardial infarction (QWMI). BACKGROUND: Limited data are available describing trends in the incidence and mortality from an initial QWMI and NQWMI from a multi-hospital community-wide perspective. METHODS: Our study was an observational study of 5,832 metropolitan Worcester, Massachusetts residents (1990 census = 437,000) hospitalized with validated initial acute MI in all greater Worcester hospitals during 11 annual periods between 1975 and 1997. RESULTS: The incidence of QWMI progressively decreased between 1975/78 (incidence rate = 171/100,000 population) and 1997 (101/100,000 population). In contrast, the incidence of NQWMI progressively increased between 1975/78 (62/100,000 population) and 1997 (131/100,000 population). Hospital death rates were 19.5% for patients with QWMI and 12.5% for those with NQWMI. After controlling for various covariates, patients with QWMI remained at significantly increased risk for hospital mortality (adjusted odds ratio = 1.63; 95% confidence interval: 1.35, 1.97). While the hospital mortality of QWMI has progressively declined over time (1975/78 = 24%; 1997 = 14%), the in-hospital mortality for NQWMI has remained the same (1975/78 = 12%; 1997 = 12%). These trends remained after adjusting for potentially confounding prognostic factors. The multivariable adjusted two-year mortality after hospital discharge declined over time for patients with QWMI and NQWMI. CONCLUSIONS: Despite impressive declines in the incidence, in-hospital and long-term mortality associated with QWMI, NQWMI is increasing in frequency and has the same in-hospital mortality now as it did 22 years ago.

Aged↗

Low dehydroepiandrosterone sulfate and heart disease in middle-aged men: cross-sectional results from the Massachusetts Male Aging Study.

PURPOSE: Serum concentrations of the adrenal androgen dehydroepiandrosterone (DHEA) and its sulfate ester (DHEAS), both of which decline with age more markedly than other sex hormone levels, have been alternately credited and discredited as "protective" correlates of heart disease. Baseline data from the Massachusetts Male Aging Study (MMAS), collected in 1987-89, provided a large population-based random sample (n = 1709) in which to examine cross-sectionally the relation of DHEA and DHEAS levels to heart disease, while controlling for a comprehensive set of potential confounders including serum lipid and hormone levels as well as smoking, alcohol intake, obesity, hypertension, diabetes, diet, medication, physical activity, and psychological measures. METHODS: The subjects were men aged 40-70 years, randomly sampled from the Massachusetts state census listing, measured and interviewed at home. Nonfasting blood samples were assayed for hormones and lipids. RESULTS: In all strata of age, smoking, and alcohol intake, the age-adjusted odds ratio for self-reported heart disease was between 0.55 and 0.85 per standard deviation (SD) of log DHEA and DHEAS concentration. Multiple logistic regression analysis indicated a strong independent role for DHEAS as a predictor of self-reported heart disease, controlling for age and the potential confounders listed above. The multiply-adjusted odds ratio for heart disease was 0.64 per SD log DHEAS concentration, with 95% confidence interval (CI) 0.50-0.83 (P = 0.0002). The DHEAS effect was not diminished by controlling for use of cardiac, vasodilator, antihypertensive, or lipid-lowering medication. CONCLUSIONS: These findings suggest that serum DHEAS levels bear an inverse relationship to heart disease, independently of a large set of established cardiovascular risk factors. The cross-sectional nature of this study requires that the findings be interpreted with caution.

Aged↗

Reduced emergency department stabilization time before cranial computed tomography in patients undergoing air medical transport.

INTRODUCTION: Advanced patient stabilization skills provided by air medical providers were hypothesized to result in streamlined emergency department (ED) stabilization of patients with head injuries requiring urgent cranial computed tomography (CCT). The goal of this study was to compare initial ED stabilization times between air- and ground-transported patients requiring urgent CCT and emergency neurosurgical hematoma evacuation. SETTING: Academic Level trauma center (annual ED census 60,000) receiving patients from ground EMS and a nurse/paramedic air medical transport team. METHODS: This retrospective study identified, from a database of 15 months of ED visits, consecutive group of adults who had CCT performed within 60 minutes of ED arrival and underwent emergent craniotomy for intracranial hematoma. Demographics, hemodynamic status, patient acuity, and time intervals between ED and CCT suite arrivals were compared between air and ground patients using chi-square, Fisher's exact, and t-tests (p = 0.05). RESULTS: Eleven air- and 39 ground-transported patients were eligible. All patient acuity data were similar between groups. Air patients were more likely to be intubated (100% versus 71.8%, p = .04) and had shorter mean ED stabilization times (29 versus 40 minutes, p = .02) than the ground. CONCLUSION: This study suggests that advanced patient stabilization offered by air medical transport may result in reduced ED stabilization time for patients requiring urgent craniotomy.

Academic Medical Centers↗

Disability life expectancy for the elderly, city of Sao Paulo, Brazil, 2000: gender and educational differences.

There is evidence that 'health life expectancy' (expected number of years to be lived in health) differs by socioeconomic status. Time spent in health or disability plays a critical role in the use of health care services. The objective of this study was to estimate 'disability life expectancy' by age, gender and education attainment for the elderly of the city of São Paulo, Brazil, in the year 2000. Data came from the SABE database, population censuses and mortality statistics (SEADE Foundation). Life expectancy with disability was calculated using Sullivan's method on the basis of the current probability of death and prevalence of disability by educational level. The prevalence of disability increased with age, for both sexes and both levels of educational attainment studied. Men showed a lower prevalence of disability, in general, and persons with lower educational attainment showed a higher prevalence of disability. Regarding life expectancy, women could expect to live longer than men, with and without disability. For both sexes, the percentage of life expectancy lived with disability decreased with increasing educational attainment. With increasing educational attainment, the sex differences in the percentage of remaining years to be lived with disability increased for most ages. Finally, the percentage of remaining years to be lived with disability increased with age for males and females, except for males with high educational attainment between the ages 70-75 and 75-80. The results may serve as a guide for public policies in the country, since health problems faced by older persons, such as disability, are the result of a number of past experiences during their life-times, such as health care, housing conditions, hygiene practices and education. Education influences health behaviours and is related, to some extent, to all these factors. Therefore, improvements in education for the disadvantaged may improve health.

Activities of Daily Living↗

Arsenic level in drinking water and mortality of lung cancer (Taiwan).

OBJECTIVE: Lung cancers have been observed among patients of arsenic intoxication since the 1950s, but data on the dose-response relationship were limited. In order to obtain such data, a study was conducted in ten townships in Taiwan. METHODS: Measurements of arsenic levels in drinking water were available for 138 villages from a census survey conducted by the government. Certificates of deaths that occurred in the villages between January 1, 1971 and December 31, 1990 were reviewed, and 673 male and 405 female mortality cases of lung cancer were identified. Multi-variate regression models were applied to assess associations between arsenic levels in drinking water and mortality of lung cancer using village as the unit. RESULTS: After adjusting for age, arsenic levels above 0.64 mg/l were associated with a significant increase in the mortality of lung cancer in both genders, but no significant effect was observed at lower levels. Post-hoc analyses confirmed such a dose-response relationship. CONCLUSIONS: The results indicate a prominent carcinogenic effect of high arsenic levels in drinking water on the lung and suggest the new 'maximum contaminant level' of 10 micro g/l published by the US Environmental Protection Agency provides sufficient protection against lung cancer. Nonetheless, further studies with exposure data on individuals are warranted to confirm these findings.

Adolescent↗

Growing social inequalities in the occurrence of overweight and obesity among young men in Sweden.

AIMS: The aims of the present study are to investigate time trends and social inequalities in mean body mass index (BMI), overweight, and obesity among 18-year-old men in Sweden from 1970 to 2000 and to explore whether social inequalities in these conditions have increased. METHODS: A record linkage was made between the Military Service Conscription Register, Population and Housing Censuses, the Register of Education and the Register of the Total Population. All 1,748,800 males born in 1952-82 who were living in Sweden at the age of 17 years in 1969-99 were eligible for this nationwide study. The study population comprises 1,500,499 18-year-old men with information on BMI (86% of eligible subjects). RESULTS: During the study period from 1970 to 2000, mean BMI increased from 20.89 kg/m2 to 22.49 kg/m2, the prevalence of overweight increased from 6.6% to 13.6% and the prevalence of obesity increased from 1.0% to 3.8%. Mean BMI and the prevalence of overweight and obesity were higher among young men with low-educated mothers than among those with high-educated mothers. A noteworthy finding was that the socioeconomic gap increased over time. CONCLUSIONS: Between 1970 and 2000, the prevalence of overweight increased twofold and the prevalence of obesity increased fourfold in this study population. The social inequalities in overweight and obesity have steadily increased among young men in Sweden during the past three decades.

Adolescent↗

Neither host-specific nor random: vascular epiphytes on three tree species in a Panamanian lowland forest.

BACKGROUND AND AIMS: A possible role of host tree identity in the structuring of vascular epiphyte communities has attracted scientific attention for decades. Specifically, it has been suggested that each host tree species has a specific subset of the local species pool according to its own set of properties, e.g. physicochemical characteristics of the bark, tree architecture, or leaf phenology patterns. METHODS: A novel, quantitative approach to this question is presented, taking advantage of a complete census of the vascular epiphyte community in 0.4 ha of undisturbed lowland forest in Panama. For three locally common host-tree species (Socratea exorrhiza, Marila laxiflora, Perebea xanthochyma) null models were created of the expected epiphyte assemblages assuming that epiphyte colonization reflected random distribution of epiphytes in the forest. KEY RESULTS: In all three tree species, abundances of the majority of epiphyte species (69-81 %) were indistinguishable from random, while the remaining species were about equally over- or under-represented compared with their occurrence in the entire forest plot. Permutations based on the number of colonized trees (reflecting observed spatial patchiness) yielded similar results. Finally, a third analysis (canonical correspondence analysis) also confirmed host-specific differences in epiphyte assemblages. In spite of pronounced preferences of some epiphytes for particular host trees, no epiphyte species was restricted to a single host. CONCLUSIONS: The epiphytes on a given tree species are not simply a random sample of the local species pool, but there are no indications of host specificity either.

Araceae↗