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Space-Time Clustering (0):
Recent article
Space-Time Clustering
Abstract
We first developed exposure series based on data from single AQMs and multiple AQMs. Because neither was found to satisfactorily represent population exposures, we subsequently developed an exposure series that disaggregated pollutant data to individual zones within the city boundary. The zonal seri...
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PMID: 21648203
PDF is available here.
PDF is available here.
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Abstract
INTRODUCTION: Air pollution concentrations in most of the megacities in India exceed the air quality guidelines recommended by the World Health Organization and may adversely affect human health in these cities. Particulate matter (PM) is the pollutant of concern in many Indian citie...
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PMID: 21648204
PDF is available here.
PDF is available here.
Abstract
In recent years, dengue has become a major international public health concern. In Thailand it is also an important concern as several dengue outbreaks were reported in last decade. This paper presents a GIS approach to analyze the spatial and temporal dynamics of dengue epidemics. The major objectiv...
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PMID: 21318014
PDF is available here.
PDF is available here.
Revista de Biologia Tropical (58 Suppl 3) 2010
Abstract
This study describes temporal and spatial abundance patterns of echinoderm larvae in La Parguera, Puerto Rico. For the temporal study, larvae were sampled by a series of monthly tows taken with a 64 microm mesh net between the new and full moon from April 2005 to July 2006, September 2006 and August...
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PMID: 21302410
PDF is available here.
PDF is available here.
Abstract
To analyze the spatial distribution of reported AIDS cases in adults and its association with living conditions in the city of Campinas, Southeastern Brazil.
Data on AIDS cases in men (n=2,945) and women (n=1,230) aged more than 13 years and living in Campinas, recorded in the SINAN (Brazilian Infor...
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PMID: 20835499
PDF is available here.
PDF is available here.
Epidemiology and Infection (138)9 2010
Abstract
This study was performed to investigate space-time patterns of Campylobacter spp. colonization in broiler flocks in Norway. Data on the Campylobacter spp. status at the time of slaughter of 16 054 broiler flocks from 580 farms between 2002 and 2006 was included in the study. Spatial relative risk ma...
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PMID: 20109260
PDF is available here.
PDF is available here.
Sarcoidosis, vasculitis, and diffuse lung diseases : official journal of WASOG / World Association of Sarcoidosis and Other Granulomatous Disorders (27)2 2010
Abstract
Sarcoidosis is a common multisystem disease of unknown cause and Ireland is among the countries with the highest reported prevalence of disease worldwide. Despite this, reports on the geographical distribution of disease and differences in mortality due to sarcoidosis within Northern...
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PMID: 21319593
PDF is available here.
PDF is available here.
Abstract
An outbreak of anthrax in Saskatchewan in 2006 affected more than 800 animals at 150 locations. The purpose of this study was to assess the spatial and temporal patterns among the cases to determine if there were any significant trends associated with this outbreak. Case and population data were fir...
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PMID: 20885827
PDF is available here.
PDF is available here.
Revista de Biologia Tropical (58 Suppl 1) 2010
Abstract
We assessed 32 permanent plots at different depth levels in six reefs areas of the Colombian Caribbean from 1998 to 2004. Temporal trends in coral and algal cover were evaluated by repeated measures ANOVA. The model included the effect of depth levels (a fixed effect), monitoring plots (a random eff...
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PMID: 20873044
PDF is available here.
PDF is available here.
Abstract
There was no evidence of a relationship between larval infestation and dengue occurrence. Incorporation of geoprocessing techniques and spatial analysis into the program, if used immediately after completion of activities, might contribute towards the control actions, thereby indicating spatial aggl...
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PMID: 20464143
PDF is available here.
PDF is available here.
Abstract
Hypothetically, the intermittent space-time pattern initially observed, could have allowed the control of the progression of the epidemic, if structured action to vectorial combat was carried out....
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PMID: 20464142
PDF is available here.
PDF is available here.
Spread of E. coli O157 infection among Scottish cattle farms: stochastic models and model selection.
Abstract
We use data from a large-scale field study carried out in Scotland to fit both "SIS"-type dynamical models and statistical risk factor models. By comparing the fit (assessed using maximum likelihood) of different dynamical models we are able to identify the most parsimonious model (using the AIC sta...
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PMID: 20640032
PDF is available here.
PDF is available here.
Drug and Alcohol Dependence (107)2-3 2010
Abstract
We used latent class analysis (LCA) to estimate latent groups based on patterns of recent club drug use and examined differences in demographic and psychological variables by class. A 3-class model fit the data best. Patterns were: Primary cocaine users (42% of sample), Mainstream users (44% of samp...
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PMID: 19939585
PDF is available here.
PDF is available here.
Euro surveillance : bulletin europeen sur les maladies transmissibles = European communicable disease bulletin (15)45 2010
Abstract
In 2010 (as of 13 October 2010), the number of adenovirus conjunctivitis cases reported to the Robert Koch Institute in Berlin, Germany, has increased by more than 250% compared with same period in the previous two years. An investigation was initiated to identify spatial or temporal clusters, possi...
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PMID: 21087592
PDF is available here.
PDF is available here.
Abstract
A system that monitors a region for a disease outbreak is called a disease outbreak surveillance system. A spatial surveillance system searches for patterns of disease outbreak in spatial subregions of the monitored region. A temporal surveillance system looks for emerging patterns of outbreak disea...
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PMID: 20595315
PDF is available here.
PDF is available here.
Public Health Reports (125)1 2010
Abstract
The system was able to detect two true clusters of illness, but none was of public health interest. Possibly due to limited population coverage, the system did not detect any of 124 known clusters, many of which were small. The number of false alarms was reasonable....
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PMID: 20402203
PDF is available here.
PDF is available here.
Abstract
The economically active portion of the population was that most affected in the study area. Census tracts show spatial heterogeneity in relation to life conditions. In addition, in some tracts, there are differences in spatial and temporal distribution of the risk of occurrence of dengue fever....
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PMID: 19967254
PDF is available here.
PDF is available here.
Abstract
Salmon farming is threatened, economically and ecologically, by infectious diseases. To reduce the risk of epidemics, authorities have developed regulations. These are based on quantitative understanding of pathways of infection, representing disease specific risks. A stochastic model was fitted to...
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PMID: 19811843
PDF is available here.
PDF is available here.
Abstract
We present some of the tools of the FMD BioPortal System (www.fmd.ucdavis.edu/bioportal), which is a web-based system that facilitates near real-time information sharing, visualization, and advanced space-time cluster analysis for foot-and-mouth disease (FMD). Using this system, FMD information that...
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PMID: 19505735
PDF is available here.
PDF is available here.
Abstract
We propose a Bayesian hierarchical survival model where latent parameters capture temporal and spatial trends in disease incidence, incorporating several individual covariates and random effects. The model is applied to a data set which consists of 65085 harvested deer in Wisconsin from 2002 to 2006...
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PMID: 19552977
PDF is available here.
PDF is available here.
Abstract
Social network analysis was used in combination with techniques for detection of temporal-spatial clusters to identify operations at high risk of receiving or dispatching pigs, from January through December 2005, in the Spanish province of Salamanca. The temporal-spatial structure of the network was...
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PMID: 19500865
PDF is available here.
PDF is available here.
Abstract
Spatial analysis of leprosy showed that the distribution of the disease is heterogeneous and is more strongly present in regions inhabited by more vulnerable groups....
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PMID: 19618024
PDF is available here.
PDF is available here.
Abstract
Problems related to basic sanitation contribute decisively to increase the risk of the disease....
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PMID: 19649472
PDF is available here.
PDF is available here.
Abstract
This study analyzes mortality from infectious diarrheic diseases in children under 5 years of age in Brazilian municipalities with more than 150,000 inhabitants, excluding State capitals. The annual mortality rates by municipality from 1990 to 2000 were analyzed using a multilevel model, with years...
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PMID: 19488494
PDF is available here.
PDF is available here.
Genetic Epidemiology (33)3 2009
Abstract
We extend the work of Beckmann and colleagues [2005 Hum. Hered. 59:67-78] who derived an HS statistic (BHS) as special case of Mantel's space-time clustering approach. The Mantel-type HS statistic correlates genetic similarity with phenotypic similarity across pairs of individuals. While phenotypic...
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PMID: 18839399
PDF is available here.
PDF is available here.
Abstract
The overall incidence of anorectal atresia/stenosis was 3.17 per 10,000 during 2001 to 2005. The incidence was higher in Eastern than that in Mid or Western parts of China and the difference was statistically significant (z = 2.50, 3.69; P = 0.012, < 0.001). The monitoring stations were grouped into...
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PMID: 19565879
PDF is available here.
PDF is available here.
Abstract
We identified space-time clustering in certain childhood cancers around diagnosis residence. These findings provided support for the involvement of environmental agents in etiological processes occurring close to diagnosis. We have reanalyzed the same British population-based dataset. The aim of the...
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PMID: 18844236
PDF is available here.
PDF is available here.
Jornal de Pediatria (85)6 2009
Abstract
The spatial distribution of hospitalizations for asthma resembles the configuration of the "arc of deforestation," mainly in the states of Rondônia and Maranhão. The distribution of annual hospitalizations for asthma decreased from 8.1 to 2.6 hospitalizations/1,000 inhabitants during the period. T...
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PMID: 20016873
PDF is available here.
PDF is available here.
Abstract
We performed a logistic regression analysis, using early versus late detection of disease as the outcome of interest.During the 2001 FMD outbreak in the United Kingdom, infected premises were more likely to be detected early under the following circumstances: 1) cattle (particularly dairy) were infe...
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PMID: 19337614
PDF is available here.
PDF is available here.
Public Health Reports (124)2 2009
Abstract
Ketamine, methylenedioxymethamphetamine (MDMA/ecstasy), cocaine, gamma-hydroxybutyrate (GHB), methamphetamine, and d-lysergic acid diethylamide (LSD/acid) have been identified as "club drugs" because of their link to club culture among young adults. Yet little is known about users' demographic differ...
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PMID: 19320366
PDF is available here.
PDF is available here.
Abstract
Malaria is a disease with focal distribution. In Brazil, settlement and gold mining areas in the Legal Amazon region present a great concentration of cases. This paper analyzes the spatial distribution of malaria cases taking into consideration environmental and social factors in the Vale do Amanhec...
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PMID: 19287935
PDF is available here.
PDF is available here.
Abstract
This is a retrospective study with ecological features that describes the epidemiological pattern and geographical distribution of American tegumentary leishmaniasis cases in Campinas, São Paulo, between 1992 and 2003. The probable infection locations were georeferenced by means of Global Positio...
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PMID: 19684980
PDF is available here.
PDF is available here.
Abstract
There existed three high risk clustering zones and corresponding time frames of VL in Kashgar Region. The center location of zone A was located in E 76.08 degrees, N 39.52 degrees, with radius as 6.58 km. The high risk time frame was from January 1st of 1999 to December 31st of 2003. Within the zone...
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PMID: 19565838
PDF is available here.
PDF is available here.
Abstract
The pandemic began in October 1918 in Bogotá and reached Boyacá by road. The three chronological waves found in the literature were not identified. We found a significant difference in the behavior of the flu pandemic in the departmnent of Boyacá with that described in Europe and North Amer...
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PMID: 19824331
PDF is available here.
PDF is available here.
Transboundary and Emerging Diseases (55)9-10 2008
Abstract
Adult milking cow movements occurring in monthly periods in 2004-2006 were analysed to compare three network analysis measures to determine the lower and upper bounds of potential maximal epidemic size in an unrestrained epidemic: the out-degree, the infection chain or output domain of a farm, and t...
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PMID: 18840200
PDF is available here.
PDF is available here.
Osteoporosis International (19)12 2008
Abstract
Of 25,634 hip fractures in individuals aged 50 years or more caused by low or moderate impact, 19,759 occurred in women (age, mean+/-SD, 80.6+/-8.6 years) and 5,875 in men (age 77.7+/-10.0 years). Incidence rates increased exponentially with age, being higher in women nation-wide (female to male rat...
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PMID: 18536955
PDF is available here.
PDF is available here.
Abstract
We critically reviewed the few previously published methods to detect changes in movement behavior likely to occur when an animal enters a profitable place. As all of them appeared to be too narrowly tuned to specific situations, we designed a new, easy-to-use method based on the time spent in the v...
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PMID: 19137941
PDF is available here.
PDF is available here.
Abstract
We partitioned territories within the boundaries of a large, almost geographically closed, population of individually marked Red-cockaded Woodpeckers (Picoides borealis) and estimated dispersal and survival parameters from hypothetical smaller study areas (sampling areas) of varying sizes and shapes...
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PMID: 19137942
PDF is available here.
PDF is available here.
Abstract
The result of the time series analysis suggests that the endemy is on the decline in the majority of regions of the state of São Paulo, while the spatial analysis shows that the coefficients are high in the northern part of the state....
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PMID: 19009159
PDF is available here.
PDF is available here.
Epidemiology (19)6 2008
Abstract
Based on the permutation model, space-time permutation scan statistics can play an important role in detecting influenza outbreaks at an early stage and identifying the spatiotemporal patterns of geographic spread....
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PMID: 18813019
PDF is available here.
PDF is available here.
Abstract
This is the first study of KS cases to use geo-referenced point pattern analysis to detect spatial and temporal clustering of KS cases. These data suggest that an infectious agent triggers the immunologic cascade of KS....
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PMID: 18852687
PDF is available here.
PDF is available here.
Abstract
The Republic of Korea experienced a foot-and-mouth disease (FMD) outbreak during May-June 2002. The present study describes epidemiological characteristics of the 2002 FMD outbreak in Korea, including the pattern of the outbreak in both time and space, transmission routes among infected farms, and c...
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PMID: 18786074
PDF is available here.
PDF is available here.
Statistics in Medicine (27)22 2008
Abstract
The early detection of outbreaks of diseases is one of the most challenging objectives of epidemiological surveillance systems. In this paper, a Markov switching model is introduced to determine the epidemic and non-epidemic periods from influenza surveillance data: the process of differenced incide...
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PMID: 18618414
PDF is available here.
PDF is available here.
Cadernos de Saude Publica (24)10 2008
Abstract
This study aimed to describe the temporal-spatial patterns of dengue epidemics in Belo Horizonte, Minas Gerais State, Brazil, from 1996 to 2002 and to analyze residential address as a proxy for exposure. Reported dengue cases were analyzed according to week of onset of symptoms and residential censu...
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PMID: 18949240
PDF is available here.
PDF is available here.
Statistics in Medicine (27)20 2008
Assessing the utility of public health surveillance using specificity, sensitivity, and lives saved.
Abstract
We re-examine the rationale for this surveillance and conclude that earlier detection is preferred because it can prevent additional morbidity and mortality. On the basis this observation, we propose evaluating the number of cases prevented by each detection method, and include this information in a...
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PMID: 18407576
PDF is available here.
PDF is available here.
Statistics in Medicine (27)20 2008
Abstract
We illustrate a two-stage approach to modeling health disparities and census tract (CT) variation in incidence over time. In the first stage, we fit race- and year-specific spatial models using CT boundaries normalized to the U.S. Census 2000. In stage 2, temporal patterns in the race- and year-spec...
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PMID: 18551507
PDF is available here.
PDF is available here.
Statistics in Medicine (27)20 2008
Abstract
The Centers for Disease Control and Prevention (CDC) created the Environmental Public Health Tracking (EPHT) program to integrate hazard monitoring, exposure, and health effects surveillance into a cohesive tracking network. Part of Florida's effort to move toward implementation of EPHT is to develo...
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PMID: 18320551
PDF is available here.
PDF is available here.
Abstract
Parasite requires an understanding of complex transmission systems where individual, population and environmental factors and their interactions can hardly been considered separately. Moreover, the importance of space and time in host population and parasite transmission processes is increasingly re...
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PMID: 18814725
PDF is available here.
PDF is available here.
Preventive Veterinary Medicine (86)1-2 2008
Abstract
We compare genetic data from computer simulations to those acquired from field samples to measure the effect of a landscape barrier on raccoon (Procyon lotor) movement, enabling risk assessment of raccoon rabies disease spread across the Niagara River from New York State into Ontario, an area curren...
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PMID: 18440659
PDF is available here.
PDF is available here.
Preventive Veterinary Medicine (86)1-2 2008
Abstract
We explored for areas where more negative sow farms became infected and areas where more sow farms eliminated the infection. These analyses demonstrated areas with significantly higher proportions of sow farms that became negative, which indicates that the eradication of the disease had a spatial co...
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PMID: 18562026
PDF is available here.
PDF is available here.
Abstract
Models including individual- or community-level measures of SES produced associations similar to those observed in previous research. Results for models including both measures are consistent with a contextual effect of SES on risk of breast cancer independent of individual SES....
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PMID: 18709175
PDF is available here.
PDF is available here.
Abstract
Our results confirm that extending hierarchical disease-mapping models to models that simultaneously consider space and time leads to a number of benefits in terms of interpretation and potential for detection of localized excesses....
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PMID: 18709143
PDF is available here.
PDF is available here.
Abstract
The non-complex, notification-based procedures adopted in the study could be routinely used by services that are responsible for dengue fever surveillance and control to identify high-risk areas....
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PMID: 18488100
PDF is available here.
PDF is available here.
Abstract
A total of 417 patients were considered as clustered secondary cases, and the CSR was 4.1% in total. The CSRs were 3.5% for the SPBP patients, 3.8% for the SNBP patients, 5.4% for the SNBN patients, and 3.4% for the extra-pulmonary patients. The CSR in SNBN patients was significantly higher than the...
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PMID: 18709968
PDF is available here.
PDF is available here.
Abstract
We recorded from single neurons while monkeys performed a joystick task. Neurons encoded the static target direction and the dynamic movement angle of the cursor. The dynamic encoding properties of many movement angle neurons reflected a forward estimate of the state of the cursor that is neither di...
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PMID: 18499800
PDF is available here.
PDF is available here.
Abstract
A total of 83 cases of acute schistosomiasis identified in Guichi District, and the point map showed that these cases were mainly distributed around the Yangtze and Qiupu rivers. The computational methods and characteristics of the four quantified indices were obtained. These acute schistosomiasis c...
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PMID: 19035045
PDF is available here.
PDF is available here.
Abstract
The objective of this study was to investigate the spatial distribution of reported hantavirus cases in São Paulo State, Brazil (n = 80), from 1993 to 2005 and identify local climatic patterns during this period. Kernel point estimation of density was used to show the highest concentrations in Ribe...
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PMID: 18461243
PDF is available here.
PDF is available here.
Epidemiology and Infection (136)4 2008
Abstract
We compared whether there were significant differences between reported outbreak and sporadic cases in terms of their sex, age, and mode and site of disease transmission. We also determined the potential role of administrative, temporal, and spatial factors within these models. We compared a variety...
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PMID: 17565768
PDF is available here.
PDF is available here.
Abstract
Cluster case events were associated with heavy rainfall (OR 3.71; 95% CI 1.83-7.51). The model did not identify socioeconomic or environmental covariates that significantly influence the risk of developing a cluster rather than non-cluster case. CONCLUSION: Clustering of leptospirosis in this urban...
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PMID: 18312472
PDF is available here.
PDF is available here.
Abstract
Active HAT foci seem to have moved from the North to the South. Endemic HAT presently appears to be limited to areas where annual rainfall exceeds 1200 mm, although the reasons for this remain unknown. There has also been a shift towards the south of the isohyets and of the northern distribution lim...
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PMID: 18397396
PDF is available here.
PDF is available here.