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Geographically weighted regression

Pengxiang Zhao, Mei-Po Kwan, Suhong Zhou
Traditionally, static units of analysis such as administrative units are used when studying obesity. However, using these fixed contextual units ignores environmental influences experienced by individuals in areas beyond their residential neighborhood and may render the results unreliable. This problem has been articulated as the uncertain geographic context problem (UGCoP). This study investigates the UGCoP through exploring the relationships between the built environment and obesity based on individuals' activity space...
February 10, 2018: International Journal of Environmental Research and Public Health
Deborah Rohm Young, Heidi Fischer, David Arterburn, Daniel Bessesen, Lee Cromwell, Matthew F Daley, Jay Desai, Assiamira Ferrara, Stephanie L Fitzpatrick, Michael A Horberg, Corinna Koebnick, Claudia L Nau, Caryn Oshiro, Beth Waitzfelder, Ayae Yamamoto
Racial/ethnic disparities in the prevalence of diagnosed hypertension are persistent but may be partially explained by racial/ethnic differences in weight category and neighborhood socioeconomic status. The authors compared hypertension prevalence rates among 4 060 585 adults with overweight or obesity across 10 healthcare systems by weight category and neighborhood education level in geographically and racially diverse individuals. Data were obtained from electronic health records. Hypertension was defined as at least two outpatient visits or one inpatient hospitalization with a coded diagnosis...
February 12, 2018: Journal of Clinical Hypertension
M Zhang, L M Wang, Z H Chen, Z P Zhao, Y C Li, Q Deng, Z J Huang, X Zhang, C Li, M G Zhou, L H Wang
Objective: To investigate the prevalence of hypercholesterolemia among Chinese adults in different geographic areas, and to analyze the related factors. Methods: China Chronic and Non-Communicable Disease and Risk Factor Surveillance was conducted in 2013, based on 298 counties/districts in 31 provinces of Chinese mainland. The adults aged 18 years old were randomly selected using multi-stage stratified clustering sampling method. Information on chronic disease and risk factors was collected using face-to-face questionnaire interview and physical measurement...
February 6, 2018: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
Torvid Kiserud, Alexandra Benachi, Kurt Hecher, Rogelio González Perez, José Carvalho, Gilda Piaggio, Lawrence D Platt
Ultrasound biometry is an important clinical tool for the identification, monitoring, and management of fetal growth restriction and development of macrosomia. This is even truer in populations in which perinatal morbidity and mortality rates are high, which is a reason that much effort is put onto making the technique available everywhere, including low-income societies. Until recently, however, commonly used reference ranges were based on single populations largely from industrialized countries. Thus, the World Health Organization prioritized the establishment of fetal growth charts for international use...
February 2018: American Journal of Obstetrics and Gynecology
Boris Kauhl, Werner Maier, Jürgen Schweikart, Andrea Keste, Marita Moskwyn
BACKGROUND: Chronic obstructive pulmonary disease (COPD) has a high prevalence rate in Germany and a further increase is expected within the next years. Although risk factors on an individual level are widely understood, only little is known about the spatial heterogeneity and population-based risk factors of COPD. Background knowledge about broader, population-based processes could help to plan the future provision of healthcare and prevention strategies more aligned to the expected demand...
2018: PloS One
Nabil E Hassan, Diann E Reischman, Robert K Fitzgerald, Edward Vincent S Faustino
OBJECTIVES: To determine the prevailing hemoglobin levels in PICU patients, and any potential correlates. DESIGN: Post hoc analysis of prospective multicenter observational data. SETTINGS: Fifty-nine PICUs in seven countries. PATIENTS: PICU patients on four specific days in 2012. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: Patients' hemoglobin and other clinical and institutional data...
January 30, 2018: Pediatric Critical Care Medicine
Jordana Moura Caetano, Geiziane Tessarolo, Guilherme de Oliveira, Kelly da Silva E Souza, José Alexandre Felizola Diniz-Filho, João Carlos Nabout
The impacts of global climate change have been a worldwide concern for several research areas, including those dealing with resources essential to human well being, such as agriculture, which directly impact economic activities and food security. Here we evaluate the relative effect of climate (as indicated by the Ecological Niche Model-ENM) and agricultural technology on actual soybean productivity in Brazilian municipalities and estimate the future geographic distribution of soybeans using a novel statistical approach allowing the evaluation of partial coefficients in a non-stationary (Geographically Weighted Regression; GWR) model...
2018: PloS One
Yang Liu, Kwok-Fai Lam, Joseph T Wu, Tommy Tsan-Yuk Lam
Detecting the temporally and spatially varying correlations is important to understand the biological and disease systems. Here we proposed a geographically weighted temporally correlated logistic regression (GWTCLR) model to identify such dynamic correlation of predictors on binomial outcome data, by incorporating spatial and temporal information for joint inference. The local likelihood method is adopted to estimate the spatial relationship, while the smoothing method is employed to estimate the temporal variation...
January 23, 2018: Scientific Reports
Grit Müller, Roland Harhoff, Corinna Rahe, Klaus Berger
OBJECTIVE: The accessibility of green space is an important aspect of the urban residential environment and has been found to be beneficial for health and well-being. This study investigates the association between different indicators of green space and the outcomes body mass index (BMI) and prevalent type 2 diabetes in an urban population. DESIGN: Population-based cross-sectional study. SETTING: Dortmund, a city located in the industrial Ruhr area in Western Germany...
January 21, 2018: BMJ Open
Joseph M Collaco, Lawrence J Appel, John McGready, Garry R Cutting
BACKGROUND: Lung function is complex trait with both genetic and environmental factors contributing to variation. It is unknown how geographic factors such as climate affect population respiratory health. OBJECTIVE: To determine whether ambient air temperature is associated with lung function (FEV1) in the general population. DESIGN/SETTING: Associations between spirometry data from two National Health and Nutrition Examination Survey (NHANES) periods representative of the U...
2018: PloS One
Hoa Q Nguyen, Desiree K Andersen, Yuseob Kim, Yikweon Jang
Background: Urban heat island (UHI) effect, the ubiquitous consequence of urbanization, is considered to play a major role in population expansion of numerous insects. Cryptotympana atrata and Hyalessa fuscata are the most abundant cicada species in the Korean Peninsula, where their population densities are higher in urban than in rural areas. We predicted a positive relationship between the UHI intensities and population densities of these two cicada species in metropolitan Seoul. Methods: To test this prediction, enumeration surveys of cicada exuviae densities were conducted in 36 localities located within and in the vicinity of metropolitan Seoul...
2018: PeerJ
Mingkai Qu, Yan Wang, Biao Huang, Yongcun Zhao
The traditional source apportionment models, such as absolute principal component scores-multiple linear regression (APCS-MLR), are usually susceptible to outliers, which may be widely present in the regional geochemical dataset. Furthermore, the models are merely built on variable space instead of geographical space and thus cannot effectively capture the local spatial characteristics of each source contributions. To overcome the limitations, a new receptor model, robust absolute principal component scores-robust geographically weighted regression (RAPCS-RGWR), was proposed based on the traditional APCS-MLR model...
January 13, 2018: Science of the Total Environment
D Kästner, B Löwe, A Weigel, B Osen, U Voderholzer, A Gumz
BACKGROUND: The length of stay (LOS) strongly influences anorexia nervosa (AN) inpatient weight outcomes. Hence, understanding the predictors of LOS is highly relevant. However, the existing evidence is inconsistent and to draw conclusions, additional evidence is required. METHODS: We conducted a prospective, multi-center study including adult female inpatients with AN. Using stepwise linear regression, the following demographic and clinical variables were examined as potential predictors for LOS: admission BMI, AN-subtype, age, age of onset, living situation, partnership status, education, previous hospitalization, self-rated depression, anxiety and somatic symptoms (PHQ-9, PHQ-15, GAD-7), self-rated therapy motivation (FEVER) and eating disorder psychopathology (EDI-2 subscale scores)...
January 15, 2018: BMC Health Services Research
B Kauhl, W Maier, J Schweikart, A Keste, M Moskwyn
BACKGROUND: Hypertension is one of the most frequently diagnosed chronic conditions in Germany. Targeted prevention strategies and allocation of general practitioners where they are needed most are necessary to prevent severe complications arising from high blood pressure. However, data on chronic diseases in Germany are mostly available through survey data, which do not only underestimate the actual prevalence but are also only available on coarse spatial scales. The discussion of including area deprivation for planning of healthcare is still relatively young in Germany, although previous studies have shown that area deprivation is associated with adverse health outcomes, irrespective of individual characteristics...
January 10, 2018: BMC Public Health
Stéphanie Tubert-Jeannin, Hélène Pichot, Bernard Rouchon, Bruno Pereira, Martine Hennequin
BACKGROUND: Despite the increasing need to prevent obesity and oral diseases in adolescents worldwide, few studies have investigated the link existing between these conditions and their common risk factors. This study aims to evaluate the oral health and weight status of New Caledonian Children (aged 6,9,12 years) and to identify, amongst 12-year-olds, risk indicators that may characterize the groups of children affected by oral diseases, obesity or both diseases. METHODS: This survey evaluated in 2011-2012 the oral health and stature-weight status and related risk indicators in a national representative sample of 6, 9 and 12 years-old children in New Caledonia...
January 8, 2018: BMC Public Health
Mehmet Pak, Sercan Gülci, Arif Okumuş
This study focuses on the geo-statistical assessment of spatial estimation models in forest crimes. Used widely in the assessment of crime and crime-dependent variables, geographic information system (GIS) helps the detection of forest crimes in rural regions. In this study, forest crimes (forest encroachment, illegal use, illegal timber logging, etc.) are assessed holistically and modeling was performed with ten different independent variables in GIS environment. The research areas are three Forest Enterprise Chiefs (Baskonus, Cinarpinar, and Hartlap) affiliated to Kahramanmaras Forest Regional Directorate in Kahramanmaras...
January 6, 2018: Environmental Monitoring and Assessment
Suleman Atique, Ta-Chien Chan, Chien-Chou Chen, Chien-Yeh Hsu, Somia Iqtidar, Valérie R Louis, Syed Abdul Shabbir, Ting-Wu Chuang
INTRODUCTION: Dengue has been endemic to Pakistan in the last two decades. There was a massive outbreak in the Swat valley in 2013. Here we demonstrate the spatio-temporal clustering and diffusion patterns of the dengue outbreak. METHODS: Dengue case data were acquired from the hospital records in the Swat district of Pakistan. Ring maps visualize the distribution and diffusion of the number of cases and incidence of dengue at the level of the union council. We applied space-time scan statistics to identify spatio-temporal clusters...
December 26, 2017: Journal of Infection and Public Health
Marappan Jayanthi, Selvasekar Thirumurthy, Muthusamy Samynathan, Muthusamy Duraisamy, Moturi Muralidhar, Jangam Ashokkumar, Koyadan Kizhakkedath Vijayan
Climate change impact on the environment makes the coastal areas vulnerable and demands the evaluation of such susceptibility. Historical changes in the shoreline positions and inundation based on projected sea-level scenarios of 0.5 and 1 m were assessed for Nagapattinam District, a low-lying coastal area in the southeast coast of India, using high-resolution Shuttle Radar Topography Mission data; multi-dated Landsat satellite images of 1978, 1991, 2003, and 2015; and census data of 2011. Image processing, geographical information system, and digital shoreline analysis system methods were used in the study...
December 28, 2017: Environmental Monitoring and Assessment
Adenantera Dwicaksono, Ian Brissette, Guthrie S Birkhead, Christine T Bozlak, Erika G Martin
OBJECTIVES: One third of school-aged children in New York State (NYS) are overweight or obese, with large geographic disparities across local regions. We used NYS student obesity surveillance data to assess whether these geographical variations are attributable to the built environment. METHOD: We combined NYS Student Weight Status Category Reporting System 2010-2012 data with other government publicly available data. Ordinary least squares regression models identified key determinants of school district-level student obesity rates for elementary and middle/high schools...
December 1, 2017: Health Education & Behavior: the Official Publication of the Society for Public Health Education
Xiaoping Wang, Fei Zhang
Water quality is highly dependent on landscape characteristics. This study explored the relationships between landscape patterns and water quality in the Ebinur Lake oasis in China. The water quality index (WQI) has been used to identify threats to water quality and contribute to better water resource management. This study established the WQI and analyzed the influence of landscapes on the WQI based on a stepwise linear regression (SLR) model and geographically weighted regression (GWR) models. The results showed that the WQI was between 56...
December 22, 2017: Environmental Science and Pollution Research International
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