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Lead levels in circumpulpal dentine of children from different geographic areas.

Lead pollution can produce a variety of effects on the human body. Shed deciduous teeth were collected from primary school children in urban, suburban and rural areas in South Africa. The lead content was determined through atomic-absorption spectrophotometry. The average circumpulpal dentine lead levels in the urban, suburban and rural samples are 74.5, 44.3 and 26.5 parts/10(6) respectively. From the results it is clear that this most inner part of dentine (approximately 300 microns thick) can concentrate up to five times more lead than the total dentine. Comparison of the lead ratio of circumpulpal dentine to that of the total dentine for the different areas demonstrates the greatest tendency for preferential lead accumulation in the circumpulpal dentine. Lead analysis of circumpulpal dentine revealed that in deciduous teeth the lead level was related to the degree of industrialization.

Child↗

Organochlorine pesticide residues in adipose tissue of Mexicans.

Concentrations of organochlorine insecticide residues such as DDT, DDE, gamma- and beta-HCH were determined in human adipose tissue samples obtained during autopsies from urban and suburban areas of Veracruz city, the state of Veracruz and out-of-state areas, collected during 1988 and 1991. The mean levels of total DDT, which constitutes the predominant accumulated pesticide, decreased from 17.45 mg/kg in 1988 to 14.06 mg/kg in 1991. The highest levels of total DDT were determined in persons from suburban areas of Veracruz city and among persons over 51 years old with the highest levels of contamination observed in patients dying of cardiovascular disorders.

Adipose Tissue↗

U.S. apartheid and the spread of AIDS to the suburbs: a multi-city analysis of the political economy of spatial epidemic threshold.

We compare mechanisms of AIDS diffusion at the county level from five U.S. central city epicenters into their associated metropolitan regions. Four of the five show an expanding 'hollowed out' center of physically and socially devastated, politically and economically abandoned high density minority neighborhoods, surrounded by rings of relatively affluent majority suburban populations. From these centers AIDS diffuses into the suburbs as a single, spatially extended disease ecosystem. The exception, San Francisco, has not yet experienced the 'hollowing out' process and is, we conclude, a major AIDS epicenter markedly less coupled to its suburbs because of that fact. This may constitute one of the few empirical observations of spatial threshold in epidemiology. Our empirical results contradict the conclusions of a recent National Research Council report that AIDS will be largely confined within marginalized urban populations. In reality U.S. urban apartheid, particularly its continuing disruption of minority social structures, has markedly accelerated the diffusion of AIDS into suburban communities. A widespread program of reform, which rebuilds minority physical and social community structures within both city and suburb, is an essential, but largely unrecognized, component to any serious strategy for the control of AIDS in the United States.

Acquired Immunodeficiency Syndrome↗

Spatial variation in nitrogen dioxide in three European areas.

In order to estimate the spatial variation within well-defined study areas, nitrogen dioxide was measured with diffusion samplers (Palmes tube) in 40-42 sites each in Germany (Munich), the Netherlands and Sweden (Stockholm County). Each site was measured over four 2-week periods during 1 year (spring 1999 to summer 2000). In each country, one reference site was measured during all periods and the results were used to adjust for seasonal variability, to improve the estimates of the annual average. Comparisons between the chemiluminescence method (European reference method) and Palmes tube measurement indicated a good agreement in Germany (with a ratio of 1.0 for Palmes tube/chemiluminescence) but underestimation for Palmes tube measurement in the Netherlands and Sweden (0.8 for both countries). The r2 values were between 0.86 and 0.90 for all three countries. The annual average values for NO2 for different sampling sites were between 15.9 and 50.6 (mean 28.8 microg/m3) in Germany, between 12.1 and 50.8 (mean 28.9 microg/m3) in the Netherlands and between 6.1 and 44.7 (mean 18.5 microg/m3) in Sweden. Comparing spatial variation between similar sites in the three countries, we did not find any significant differences between annual average levels for urban traffic sites. In Sweden, annual average levels in urban background and suburban backgrounds sites were about 8 microg/m3 lower than comparable sites in Germany and the Netherlands. Comparing site types within each country only urban traffic sites and suburban background sites differed in Germany. In the Netherlands and Sweden, the urban traffic sites differed from all other sites and in Sweden also the urban background sites differed from the other background sites. The observed contribution from local traffic was similar in the Netherlands and Sweden (10 and 8 microg/m3, corresponding to 26-27% of the NO2 concentration found in the urban traffic sites). In Germany, the contribution from local traffic was only 3 microg/m3, corresponding to 9% of the NO2 concentration found in the urban traffic sites. The spatial variation was substantially larger for NO2 than the variation for PM2.5 and similar to PM2.5 absorbance, measured in the same locations.

Air Pollutants↗

Effects of the Quebec Heart Health Demonstration Project on adult dietary behaviours.

BACKGROUND: There are few studies which have evaluated the dietary impact of multiple community-based cardiovascular disease prevention programs. METHODS: A 5-year, multifactorial community-based heart disease prevention program was conducted by regional public health departments in three sites: urban, suburban and rural. The experimental and control communities were composed of independent samples of 4,863 adults in 1993 and 5,260 in 1997. The impact of the program on diet was assessed by a validated, self-administered food frequency questionnaire which yielded a Global Dietary Index (GDI). RESULTS: The urban and suburban sites showed improvements in mean GDI in both exposed and non-exposed groups while the rural site mean GDI showed deterioration in both groups (n.s.). The analysis of variance showed that the group x year interaction terms were not significant for each site and sex, indicating that the intervention did not have measurable effects on dietary behaviours. Inclusion of confounding variables did not alter those findings. Analyses of specific food group indices gave similar results. CONCLUSIONS: Future intervention programs could benefit from considering physical and social environments as well as public policy changes to improve efficacy.

Adult↗

Effects of the year 2000 influenza vaccine delay on elderly patients' attitudes and behaviors.

BACKGROUND: A substantial delay in distribution of influenza vaccine occurred in the 2000-2001 influenza season. Our objective was to quantify the impact of this delay on immunization rates, location of receipt of immunization, and patient attitudes and beliefs about the influenza vaccine. METHODS: Inner-city and suburban medical practices that received influenza vaccine supply on-time or late in the season (late-receipt) were selected. A random sample of elderly patients from each practice completed telephone interviews. RESULTS: Of 775 eligible patients, we interviewed 72%. The odds of receiving influenza vaccine in late-receipt practices compared to on-time practices did not significantly differ in either the suburban stratum (adjusted OR = 0.9, 95% CI 0.5-1.6) or the inner-city stratum (adjusted OR = 1.5, 95% CI 0.8-2.8). Very few respondents (4%-11%) reported changes in their beliefs about the vaccine, its safety or efficacy, from previous years. More patients in late-receipt practices reported receiving influenza vaccine at locations other than their regular doctor's offices in the shortage year compared with the previous year. CONCLUSIONS: The 2000-2001 influenza vaccine delay changed vaccination location, but did not change influenza vaccination rates.

Aged↗

Use of automated external defibrillators by police officers for treatment of out-of-hospital cardiac arrest.

OBJECTIVE: To determine the feasibility of police officers providing defibrillation with automated external defibrillators (AEDs) and to assess the effectiveness of this strategy in reducing time to defibrillation of victims of out-of-hospital sudden cardiac arrest. METHODS: This was a prospective, interventional cohort study with historical controls conducted in 7 suburban communities in which police usually arrived at the scene of medical emergencies before EMS personnel. All adult patients who suffered cardiac arrest before EMS arrival and on whom EMS personnel attempted resuscitation were enrolled. Police officers who were trained to use and equipped with AEDs during the intervention phase were dispatched simultaneously with EMS to medical emergencies. Police were instructed to use the AED immediately on determination of pulselessness. Outcome measures were the difference between control and intervention phases in interval from the time the call was received at dispatch to the time of first defibrillation and in rate of survival to hospital discharge for patients initially in ventricular fibrillation. RESULTS: EMS personnel attempted 183 resuscitations in the control phase and 283 during the intervention; of these, 80 (44%) and 127 (45%), respectively, involved patients with initial ventricular fibrillation rhythms. Mean time to defibrillation decreased from 11.8+/-4.7 minutes in the control phase to 8.7+/-3.7 minutes in the intervention phase (P<.0001). Survival to hospital discharge of patients in ventricular fibrillation did not differ between phases (6% control versus 14% intervention, P=.1). When police arrived before EMS personnel, shock administered by police compared with shock administered by EMS was associated with improved survival (26% [12/46] versus 3% [1/29], P=.01). Logistic regression analysis revealed AED use was an independent predictor of survival to hospital discharge. CONCLUSION: In 7 suburban communities, police use of AEDs decreased time to defibrillation and was an independent predictor of survival to hospital discharge.

Adult↗

Adolescent substance use, sexual behavior, and metropolitan status: is "urban" a risk factor?

PURPOSE: To determine if urban youth ("metropolitan" status) are at greater risk of engaging in risk behaviors than suburban or rural youth. METHODS: We analyzed data on substance use and sexual risk behaviors from the national school-based Youth Risk Behavior Survey (YRBS) conducted in 1999, an anonymous questionnaire self-administered by students in grades 9 through 12. The national survey employs a multistage cluster sample to produce a nationally representative sample of high school students. Data were analyzed using SUDAAN software to take into account the sampling model. RESULTS: In 1999, metropolitan status was not a significant determining factor for involvement in risk behaviors. Of the specific risk factors examined in this analysis, there were no significant differences between rural and suburban youth, and these two groups were combined as "nonurban." In subsequent analysis of urban vs. nonurban youth, no significant differences in risk behaviors were found on bivariate or multivariate analyses. CONCLUSIONS: This analysis suggests that metropolitan status has little if any association with youth engaging in substance use and sexual risk behaviors. In addition, it appears that urban youth are engaging in these risk behaviors no more frequently than their nonurban counterparts.

Adolescent↗

Aquatic toxicity due to residential use of pyrethroid insecticides.

Pyrethroids are the active ingredients in most insecticides available to consumers for residential use in the United States. Yet despite their dominance in the marketplace, there has been no attempt to analyze for most of these compounds in watercourses draining residential areas. Roseville, California was selected as a typical suburban development, and several creeks that drain subdivisions of single-family homes were examined. Nearly all creek sediments collected caused toxicity in laboratory exposures to an aquatic species, the amphipod Hyalella azteca, and about half the samples caused nearly complete mortality. This same species was also found as a resident in the system, but its presence was limited to areas where residential influence was least. The pyrethroid bifenthrin is implicated as the primary cause of the toxicity, with additional contributions to toxicity from the pyrethroids cyfluthrin and cypermethrin. The dominant sources of these pyrethroids are structural pest control by professional applicators and/ or homeowner use of insecticides, particularly lawn care products. The suburbs of Roseville are unlikely to be unique, and similar sediment quality degradation is likely in other suburban areas, particularly in dry regions where landscape irrigation can dominate seasonal flow in some water bodies.

Amphipoda↗

Comparative study on sleep health and lifestyle of the elderly in the urban areas and suburbs of Okinawa.

The sleep health and lifestyles of the elderly living in the urban and suburban areas of Okinawa prefecture, which is well known for the longevity of its inhabitants, were compared. The study revealed that sleep health and activities of daily living (ADL) were significantly better among the elderly living in suburban areas. There were more complaints of sleep problems from the elderly living in urban areas and their bedtimes were significantly later, indicating that a nocturnal lifestyle was related to sleep deterioration. In the suburbs, a significantly greater number of elderly people regularly took short naps and exercised in the evening. The study also suggested that daily habits such as short naps and taking appropriate exercise in the evenings contributed to good sleep, and that sleep health was related to the ADL of the elderly.

Aged↗

Correlates of diet quality in the Quebec population.

OBJECTIVE: To determine the correlates of a high-fat diet in urban, suburban and rural areas of Quebec, Canada. DESIGN: A secondary analysis of data collected as part of a 5-year multi-factorial, multi-setting, community-intervention project. SETTING: Urban, suburban and rural settings of the province of Quebec, 1997. SUBJECTS: Data were analysed from a sample of 5214 participants (2227 males, 2987 females). A food-frequency questionnaire was completed and a global index of food quality was calculated. Logistic regression was used to identify correlates of a diet high in total fats, saturated fat and cholesterol. RESULTS: In both genders, lower level of education, smoking status, French and English languages compared with other languages spoken at home, and a rural environment were associated with poor diet quality. Having no intention to eat low-fat dairy products more often was associated with a high-fat diet. In men, obesity (body mass index >/=30 kg m(-2)) and absence of reported health problems were correlates of a high-fat diet, while, in women, lower physical activity was a correlate. CONCLUSIONS: Future health interventions in Quebec should target people with low education, smokers and those living in a rural environment. Obese men and sedentary women should have access to specific dietetic resources.

Adolescent↗

Umbilical cord blood lead levels in the Québec City area.

The purposes of this study were to determine the umbilical cord blood lead levels in a nonindustrialized city and the effect of place of residence on the blood lead levels of newborns. During spring 1990, we conducted a survey of umbilical cord blood lead levels from 823 live newborns in two hospitals from the Québec City area. The geometric mean of cord blood lead levels was 0.094 mumol/l (95% confidence interval [95% CI] = 0.088-0.099). Less than 1% (95% CI = 0.2-1.7) of the babies had cord blood lead levels at 0.48 mumol/l or greater. We estimate that each year in the Québec City area between 150 and 200 newborns are at risk for developing psychoneurological problems during their first years of life. Frequency distribution of cord blood lead level did not differ significantly among urban, suburban, and rural areas; however, a higher proportion of cord blood lead levels greater than 0.25 mumol/l was observed in the urban area (9.4%), compared with suburban (2.6%) and rural (3.1%) areas. The proximity of potential environmental lead sources (highway, industry, city center) located within 1/2 mile (.8 km) of the mother's residence was associated with a high cord blood lead level. Cord blood lead levels were also elevated for newborns whose mothers lived in newer (< or = 5 y) and older buildings (> or = 50 y). We concluded that the environmental characteristics of the mother's residence are a better indicator of environmental lead exposure than the place of residence.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗

Parental enforcement of bedtime during childhood modulates preference of Japanese junior high school students for eveningness chronotype.

We examined the effect of home bedtime discipline during childhood on morningness and eveningness (M-E) preference by Japanese junior high school students. M-E was assessed by the M-E Questionnaire (MEQ) of Torsvall and Akerstedt (the higher the score, the greater the preference for morningness), and parental determination of bedtime during childhood was ascertained using an original questionnaire. The average M-E score of adolescents living in urban Kochi City (mean +/- SD; 15.10 +/- 3.42) was significantly lower (P < .01) than the score of those in suburban districts (16.14 +/- 3.44). Overall, 43.1% of the junior high school students in Kochi City compared to 53.0% of the students living in suburban districts had their bedtime decided during childhood by parents (P < .01). In Kochi City, the M-E score for boys (14.62 +/- 3.51) was lower (P < .01) than girls (15.53 +/- 3.28). During childhood, parents decided the bedtime for 49% of the girls compared to 36.6% of the boys (P < .01). Boys whose bedtime was not decided by parents during childhood had a somewhat stronger preference for eveningness (14.20 +/- 3.53) (P < .05) compared to those whose bedtime was decided by parents (15.12 +/- 3.36). The results suggest bedtime discipline at home during childhood has an effect on adolescent chronotype, modulating the extent of shift to evening ness in Japanese junior high school boys in particular.

Adolescent↗

Contrasting children and women's health and the determinants of health in a small-sized city.

Contrasts that exist in urban infrastructure and accessibility of public health and social services between suburban and urban districts of mega-cities have been well defined. There has been less research in small-sized cities (population under 500,000). This cross-sectional study was done on 1,728 ever-married reproductive-aged women living in Manisa, Turkey, in the year 2000. The probability proportion to size cluster sampling approach was used in the sample selection. Data were collected for women and 7,016 inhabitants of the interviewed households. The data were collected from the women by face to face interviews. Suburban areas (illegally occupied public land called "Gecekondu" dwellings) in Manisa differ from other urban regions (legal settlements of the city) on socioeconomic factors including household occupancy, adult literacy, social class, rates of religious marriages, unemployment, health insurance coverage, migration, cultural segregation, and social status of women. Some traditional practices were also highly prevalent in gecekondu families, where poverty is more common. Although gross fertility rate (GFR), total fertility rate (TFR), and percent decrease of the TFR were higher for gecekondu women than urban women, total wanted fertility rate (TWFR) was lower. In urban neighborhoods, prevalence of contraceptive use was higher, and the infant and child mortality rates were lower; however, when rates were adjusted for mother's age, education and number of births, the differences turned out to be nonsignificant. Women living in urban areas receive better antenatal care, child immunization services, and professional health delivery assistance and services in a health facility; these services are very scarce in gecekondu districts. Health status of gecekondu populations can be improved by social and economic support and by making health services more available and accessible, especially maternity and child health services.

Adolescent↗

Serologic evidence of subclinical pertussis in immunized children.

Incidental to a vaccine study involving 783 immunized children conducted at two study sites, inner city children had significantly higher geometric mean pertussis agglutinin titers compared with suburban children just before the fourth dose of diphtheria-tetanus-whole cell pertussis vaccine (47 vs. 25; P less than 0.001). Higher titers in the inner city were correlated with residence in census tracts where cases of pertussis were reported. Three hundred thirty-two children in a placebo arm of the study who were clinically observed and had paired serum samples taken during a 2- to 4-month period were analyzed for evidence of natural Bordetella infection. Twelve (11%) inner city children and three (1.3%) suburban children had spontaneous 4-fold or greater rises in at least two different pertussis antibodies measured (agglutinin, antitoxin or enzyme-linked immunosorbent assay for IgG to pertussis toxin, IgG and IgA to filamentous hemagglutinin). Eighty percent of these children had IgA to filamentous hemagglutinin. Nine of 12 inner city children with serologic evidence of pertussis lived within 6 blocks of a case of pertussis reported within 1 month of the observed antibody rise in study subjects; none had a household member with pertussis and none had symptomatic disease.

Agglutination Tests↗

Discovery method and stage of breast cancer in two different patient populations.

Our purpose was to determine the discovery method and stage of newly discovered breast cancers at two different medical centers. To do this, we conducted a retrospective chart review at our urban and suburban teaching hospitals during 1991 through 1992 and 1992, respectively. Only 29 (26%) of 112 cancers at our urban hospital were discovered mammographically; 38 (38%) of 100 neoplasms were discovered using mammography at our suburban hospital. At both institutions, the mammographically discovered cancers had a lower stage than those detected clinically. Despite proven benefits and the efforts of organizations such as the American College of Radiology and the American Cancer Society, screening mammography remains underused in the patient populations that we studied.

Adult↗

Barriers to following dietary recommendations in Type 2 diabetes.

AIMS: To evaluate barriers to following dietary recommendations in patients with Type 2 diabetes. METHODS: We conducted focus groups and surveys in urban and suburban VA and academic medical centres. For the written survey, a self-administered questionnaire was mailed to a random sample of 446 patients with diabetes. For the focus groups, six groups of patients with diabetes (three urban, three suburban) were conducted, with 6-12 participants in each group. The focus groups explored barriers across various types of diabetes self-management; we extracted all comments relevant to barriers that limited patients' ability to follow a recommended diet. RESULTS: The written survey measured the burden of diabetes therapies (on a seven-point rating scale). Moderate diet was seen as a greater burden than oral agents (median 1 vs. 0, P = 0.001), but less of a burden than insulin (median 1 vs. 4, P < 0.001). A strict diet aimed at weight loss was rated as being similarly burdensome to insulin (median 4 vs. 4, P = NS). Despite this, self-reported adherence was much higher for both pills and insulin than it was for a moderate diet. In the focus groups, the most commonly identified barrier was the cost (14/14 reviews), followed by small portion sizes (13/14 reviews), support and family issues (13/14 reviews), and quality of life and lifestyle issues (12/14 reviews). Patients in the urban site, who were predominantly African-American, noted greater difficulties communicating with their provider about diet and social circumstances, and also that the rigid schedule of a diabetes diet was problematic. CONCLUSIONS: Barriers to adherence to dietary therapies are numerous, but some, such as cost, and in the urban setting, communication with providers, are potentially remediable. Interventions aimed at improving patients' ability to modify their diet need to specifically address these areas. Furthermore, treatment guidelines need to consider patients' preferences and barriers when setting goals for treatment.

Diabetes Mellitus, Type 2↗

Environmental safety preparation for community-based nursing educational experiences: measurable indices.

Cities, formerly the hub of cultural activities and entertainment, are now more often associated with crime statistics and poverty. Students' emotional comfort and safety must therefore be prime considerations in planning community-based nursing education. This study piloted an instrument that promises to be useful in labeling situations that affect an individual's comfort level in an urban setting. Questions that guided the study included: (1) Does the Environmental Comfort Scale (ECS) score vary with the respondents' residential zone (urban = 1, suburban = 2, rural = 3)? (2) Is the instrument (Environmental Comfort [Fear] Scale) reliable? A one-shot, one-group, pre-experimental design was employed. Participants were self-selected from a junior baccalaureate nursing class (N = 79) that was a predominantly suburban-bred, relatively privileged population. The ECS contained nine specific environmental-situation items that could be construed as potentially threatening to safety. Respondents were to indicate on a five-point Likert scale the extent to which they would be fearful in each situation; 1 = least fearful and 5 = most fearful. Findings showed practically no difference in responses by residential zone and suggest a need for item refinement and a need to lengthen the tool to improve alpha coefficients. Further, the increasing demand for measurable outcomes underscores the need for continued work on instruments to produce such data. The deinstitutionalization of health care from contained grounds to uncontained community-based settings makes it imperative that nursing education attend to the challenges of safety education.

Community Health Nursing↗