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Epidemiologic Methods

Alan J Bergmann, Gary L Points, Richard P Scott, Glenn Wilson, Kim A Anderson
With hundreds of thousands of chemicals in the environment, effective monitoring requires high-throughput analytical techniques. This paper presents a quantitative screening method for 1550 chemicals based on statistical modeling of responses with identification and integration performed using deconvolution reporting software. The method was evaluated with representative environmental samples. We tested biological extracts, low-density polyethylene, and silicone passive sampling devices spiked with known concentrations of 196 representative chemicals...
March 19, 2018: Analytical and Bioanalytical Chemistry
Tian-Bao Huang, Guang-Chen Zhou, Chuan-Peng Dong, Li-Ping Wang, Yang Luan, Jing-Ting Ye, Xiao Gu, Xu-Dong Yao, Jun-Hua Zheng, Xue-Fei Ding
Marital status is an independent prognostic factor for survival in several types of cancer, but has not been fully studied in prostate cancer (PCa). A total of 95,846 men diagnosed with PCa were treated with radical prostatectomy (RP) between 2004 and 2009 within 18 Surveillance, Epidemiology and End Results registries. Survival curves were generated using Kaplan-Meier estimates and differences in survival were assessed using the log-rank test. Cox regression models were used to assess the impact of marital status on survival outcomes...
April 2018: Oncology Letters
Heidi L Tessmer, Kimihito Ito, Ryosuke Omori
To estimate and predict the transmission dynamics of respiratory viruses, the estimation of the basic reproduction number, R 0 , is essential. Recently, approximate Bayesian computation methods have been used as likelihood free methods to estimate epidemiological model parameters, particularly R 0 . In this paper, we explore various machine learning approaches, the multi-layer perceptron, convolutional neural network, and long-short term memory, to learn and estimate the parameters. Further, we compare the accuracy of the estimates and time requirements for machine learning and the approximate Bayesian computation methods on both simulated and real-world epidemiological data from outbreaks of influenza A(H1N1)pdm09, mumps, and measles...
2018: Frontiers in Microbiology
Jacob Y Shin, Ja Kyoung Yoon, Gaurav Marwaha
PURPOSE: The purpose of this study is to assess temporal trends in population-based treatment and survival rates in patients with early-stage non-small cell lung cancer (NSCLC). METHODS: Data were extracted from the Surveillance, Epidemiology, and End Results (SEER) database. Chi-square test, Kaplan-Meier method, and Cox regression models were employed in SPSS 23.0. RESULTS: Fifty-seven thousand and eighty-eight NSCLC patients with early-stage disease from 1988 to 2014 were identified...
March 17, 2018: Lung
Jana Amlerova, Ibrahim Bitar, Jaroslav Hrabak
Tuberculosis (TB) is considered one of the most serious infectious diseases worldwide. Effective control of tuberculosis infection involves multiple steps, such as reliable detection, treatment, an epidemiological control as a part of case management, and further surveillance and monitoring of TB spread in the human population. Due to the accelerating advances in molecular biology, especially in DNA sequencing, in the past decade, the application of these methods has become crucial for TB evolution studies, differentiation of Mycobacterium tuberculosis genotypes, and their distribution...
March 17, 2018: Folia Microbiologica
Diego Averaldo Guiguet Leal, Doris Sobral Marques Souza, Karin Silva Caumo, Gislaine Fongaro, Lua Ferreira Panatieri, Maurício Durigan, Marilise Brittes Rott, Célia Regina Monte Barardi, Regina Maura Bueno Franco
Waterborne, food-borne and sewage-borne pathogens are a major global concern, with the annual recurrence, most notably during the summer, of outbreaks of gastroenteritis of unconfirmed etiology associated with recreational activities in marine environments. The consumption of contaminated water-based foodstuffs is also related to outbreaks of human illness. The main goals of the present study were: i) to identify the genetic assemblages of Giardia duodenalis cysts in growing and depurated oysters destined for human consumption on the southern coast of São Paulo, Brazil; ii) to verify the main circulating G...
March 9, 2018: Water Research
Gül Yücel, Mustafa Kendirci, Ülkü Gül
STUDY OBJECTIVE: To determine the cross-sectional characteristics of menstruating girls, dysmenorrhea and the frequencies of related problems. DESIGN: Descripitive, cross-sectional study. SETTING: Randomly selected primary, junior and high schools in the city center of Kayseri. PARTICIPANTS: 2000 female adolescents of ages between 9 and 18 years. MAIN OUTCOME MEASURE: We used a questionnaire addressing the epidemiological characteristics of menstruation, such as age at menarche, duration of menstrual intervals, average days of bleeding, and any menstrual problems and their frequencies...
March 14, 2018: Journal of Pediatric and Adolescent Gynecology
Lejla Čalkić, Muhamed Skomorac, Salih Tandir, Suad Sivić, Lejla Bajramović Omeragić
Aim To investigate epidemiological characteristics of the measles epidemic (risk factors and reasons for its emergence) in order to establish better control and prevention of future epidemics as well as to determine an influence of poor collective immunization of children against measles on appearance of epidemic disease. Methods An open retrospective epidemiological study of measles infection was conducted during the epidemic in Zenica-Doboj Canton (ZDC) in the period 2014-2015. Disease reports, Disease Reporting Forms for measles and rubella cases and the Bulletin of the Institute for Health and Food Safety Zenica were used for data collection...
February 1, 2018: Medicinski Glasnik
Hannah Blencowe, Sowmiya Moorthie, Matthew W Darlison, Stephen Gibbons, Bernadette Modell
In the absence of intervention, early-onset congenital disorders lead to pregnancy loss, early death, or disability. Currently, lack of epidemiological data from many settings limits the understanding of the burden of these conditions, thus impeding health planning, policy-making, and commensurate resource allocation. The Modell Global Database of Congenital Disorders (MGDb) seeks to meet this need by combining general biological principles with observational and demographic data, to generate estimates of the burden of congenital disorders...
March 17, 2018: Journal of Community Genetics
Meenu Singh, Nandini Paul, Shreya Singh, Gyan Ranjan Nayak
Asthma is an allergic, respiratory disorder characterized by hyper responsiveness of the airway to external stimuli. Considerable research is currently being directed towards understanding the role of environmental and genetic factors contributing to the development of asthma and its severity. Recent years have seen a substantial rise in evidence linking fungi to asthma. Few major clinical conditions associated with fungal sensitization and hypersensitive immune response are Allergic bronchopulmonary aspergillosis (ABPA), Allergic fungal rhinosinusitis (AFRS) and Severe asthma with fungal sensitization (SAFS)...
March 17, 2018: Indian Journal of Pediatrics
Chenglin Luo, Jingjing Cao, Rui Peng, Qiaoyun Guo, Hua Ye, Peng Wang, Kaijuan Wang, Chunhua Song
Functional polymorphisms in Linc-ROR may change its ability of regulation by regulating Linc-ROR expression. However, these functional polymorphisms in Linc-ROR and their associations with breast cancer (BC) susceptibility were scarcely reported. In this molecular epidemiological study, four SNPs (rs6420545, rs4801078, rs1942348 and rs9636089) were selected in Linc-ROR by bioinformatics method. Unconditional logistic regression model was performed to analyze the associations between four SNPs and BC susceptibility adjusted for reproductive factors...
March 16, 2018: Scientific Reports
H Morioka, M Nagao, S Yoshihara, H Ohge, K Kasahara, N Shigemoto, T Kajihara, M Mori, M Iguchi, Y Tomita, S Ichiyama, T Yagi
BACKGROUND: The Japanese government adopted a national action plan on antimicrobial resistance, which aims to reduce drug-resistant pathogens and antimicrobial use. A point-prevalence survey (PPS) is a useful surveillance method to gain information about hospital epidemiology; however, no multi-centre PPS has previously been performed in Japan. AIM: To investigate general information about hospital epidemiology, healthcare-associated infections (HCAIs), and antimicrobial use in multiple Japanese university hospitals...
March 13, 2018: Journal of Hospital Infection
Órla Gilheaney, Leo Fa Stassen, Margaret Walshe
PURPOSE: Temporomandibular disorders (TMDs) are caused by changes in the structure and/or function of the temporomandibular joint, masticatory muscles, and/or osseous components. TMDs can result in oral stage dysphagia (OD) with potential effects on function and patient well-being. Little is known about the prevalence, nature, and management of TMD-related OD. The aims of the present study were to estimate the prevalence and nature of OD in adult TMD patients and to identify the common management techniques used to manage the signs and symptoms of TMD-related OD...
February 20, 2018: Journal of Oral and Maxillofacial Surgery
Azucena Muñoz-Ramírez, Aracely López-Monteon, Angel Ramos-Ligonio, Enrique Méndez-Bolaina, Mario R B Guapillo-Vargas
Female sex workers (FSWs) have been considered a key population for sexually transmitted infections (STIs); therefore, they are periodically screened as a requirement to obtain a work card. However, there is insufficient epidemiological data on STIs among FSWs in Mexico. The detection of Trichomonas vaginalis is limited to microscopic studies and the molecular screening of Human papillomavirus (HPV) is only done to women 35 years of age and older. The objective of this study was to determine the prevalence of T...
March 13, 2018: Revista Argentina de Microbiología
Thomas Kovac, Tom Haber, Frank Van Reeth, Niel Hens
BACKGROUND: Over the last years, substantial effort has been put into enhancing our arsenal in fighting epidemics from both technological and theoretical perspectives with scientists from different fields teaming up for rapid assessment of potentially urgent situations. This paper focusses on the computational aspects of infectious disease models and applies commonly available graphics processing units (GPUs) for the simulation of these models. However, fully utilizing the resources of both CPUs and GPUs requires a carefully balanced heterogeneous approach...
March 16, 2018: BMC Bioinformatics
Daniel Cahill, Sevin Turcan
Malignant glioma is a common type of brain tumor that remains largely incurable. Although a definitive cell of origin of gliomas remains elusive, numerous population studies, sequencing efforts, and genetically engineered mouse models have contributed to our understanding of the early events that may lead to gliomagenesis. Herein we summarize our current knowledge on the population epidemiology of gliomas, heritable genetic risk factors, the somatic events that contribute to tumor evolution, and mouse models that have shed light on the glioma cell of origin...
February 2018: Seminars in Neurology
Sabine Hoffmann, Chantal Guihenneuc, Sophie Ancelet
Exposure measurement error can be seen as one of the most important sources of uncertainty in studies in epidemiology. When the aim is to assess the effects of measurement error on statistical inference or to compare the performance of several methods for measurement error correction, it is indispensable to be able to generate different types of measurement error. This paper compares two approaches for the generation of Berkson error, which have recently been applied in radiation epidemiology, in their ability to generate exposure data that satisfy the properties of the Berkson model...
March 15, 2018: Radiation and Environmental Biophysics
Emily Goldmann, James H Stark, Farzana Kapadia, Matthew B McQueen
The rapid growth in undergraduate public health education has offered an increasing number of undergraduate students training in epidemiology. Epidemiology courses introduce undergraduate students to a population health perspective and provide opportunities for these students to build essential skills and competencies such as ethical reasoning, teamwork, comprehension of scientific methods, critical thinking, quantitative and information literacy, ability to analyze public health information, and effective writing and oral communication...
March 13, 2018: American Journal of Epidemiology
S Dolatabadi, B Ahmadi, A Rezaei-Matehkolaei, H Zarrinfar, A Skiada, H Mirhendi, R Nashibi, F Niknejad, M Nazeri, A Rafiei, M Gharaghani, M Erami, S Taghipour, F Piri, K Makimura
Mucormycosis is a devastating infection caused by Mucoralean fungi (Mucormycotina, Mucorales). Data concerning the global epidemiology of mucormycosis are scarce and little is known about the characteristics of mucormycosis in Iran. In this study, we aimed to understand the distribution of this infection in Iran retrospectively and to ascertain whether the patterns of infection are associated with specific host factors or not. A total of 208 cases were included in this study occurring during 2008-2014 and were validated according to (EORTC/MSG) criteria...
March 12, 2018: Journal de Mycologie Médicale
Paul Rood, Getty Huisman-de Waal, Hester Vermeulen, Lisette Schoonhoven, Peter Pickkers, Mark van den Boogaard
BACKGROUND: Delirium occurs frequently in intensive care unit (ICU) patients and is associated with numerous deleterious outcomes. There is a large variation in reported delirium occurrence rates, ranging from 4% to 89%. Apart from patient and treatment-related factors, organisational factors could influence delirium incidence, but this is currently unknown. OBJECTIVE: To systematically review delirium incidence and determine whether or not organisational factors may contribute to the observed delirium incidence in adult ICU patients...
March 12, 2018: Australian Critical Care: Official Journal of the Confederation of Australian Critical Care Nurses
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