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Methodology, epidemiology

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https://www.readbyqxmd.com/read/28444781/constructing-longitudinal-disease-progression-curves-using-sparse-short-term-individual-data-with-an-application-to-alzheimer-s-disease
#1
C A Budgeon, K Murray, B A Turlach, S Baker, V L Villemagne, S C Burnham
In epidemiology, cohort studies utilised to monitor and assess disease status and progression often result in short-term and sparse follow-up data. Thus, gaining an understanding of the full-term disease pathogenesis can be difficult, requiring shorter-term data from many individuals to be collated. We investigate and evaluate methods to construct and quantify the underlying long-term longitudinal trajectories for disease markers using short-term follow-up data, specifically applied to Alzheimer's disease. We generate individuals' follow-up data to investigate approaches to this problem adopting a four-step modelling approach that (i) determines individual slopes and anchor points for their short-term trajectory, (ii) fits polynomials to these slopes and anchor points, (iii) integrates the reciprocated polynomials and (iv) inverts the resulting curve providing an estimate of the underlying longitudinal trajectory...
April 25, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/28442941/competency-based-tool-for-evaluation-of-community-based-training-in-undergraduate-medical-education-in-india-a-delphi-approach
#2
Hemant Deepak Shewade, Kathiresan Jeyashree, Selvaraj Kalaiselvi, Chinnakali Palanivel, Krishna Chandra Panigrahi
INTRODUCTION: A community-based training (CBT) program, where teaching and training are carried out in the community outside of the teaching hospital, is a vital part of undergraduate medical education. Worldwide, there is a shift to competency-based training, and CBT is no exception. We attempted to develop a tool that uses a competency-based approach for assessment of CBT. METHODS: Based on a review on competencies, we prepared a preliminary list of major domains with items under each domain...
2017: Advances in Medical Education and Practice
https://www.readbyqxmd.com/read/28440974/risk-estimation-for-lung-cancer-in-libya-analysis-based-on-standardized-morbidity-ratio-poisson-gamma-model-bym-model-and-mixture-model
#3
Maryam Ahmed Alhdiri, Nor Azah Samat, Zulkifley Mohamed
Cancer is the most rapidly spreading disease in the world, especially in developing countries, including Libya. Cancer represents a significant burden on patients, families, and their societies. This disease can be controlled if detected early. Therefore, disease mapping has recently become an important method in the fields of public health research and disease epidemiology. The correct choice of statistical model is a very important step to producing a good map of a disease. Libya was selected to perform this work and to examine its geographical variation in the incidence of lung cancer...
March 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28440782/systematization-of-clinical-trials-related-to-treatment-of-metabolic-syndrome-1980-2015
#4
Santiago Cardona Velásquez, Laura Guzmán Vivares, Jaiberth Antonio Cardona-Arias
INTRODUCTION: Despite the clinical, epidemiological, and economic significance of metabolic syndrome, the profile of clinical trials on this disease is unknown. OBJECTIVE: To characterize the clinical trials related to treatment of metabolic syndrome during the 1980-2015 period. METHODS: Systematic review of the literature using an ex ante search protocol which followed the phases of the guide Preferred Reporting Items for Systematic Reviews and Meta-Analyses in four multidisciplinary databases with seven search strategies...
February 2017: Endocrinol Diabetes Nutr
https://www.readbyqxmd.com/read/28439876/functional-vision-and-cognition-in-infants-with-congenital-disorders-of-the-peripheral-visual-system
#5
Naomi Dale, Elena Sakkalou, Michelle O'Reilly, Clare Springall, Michelle De Haan, Alison Salt
AIM: To investigate how vision relates to early development by studying vision and cognition in a national cohort of 1-year-old infants with congenital disorders of the peripheral visual system and visual impairment. METHOD: This was a cross-sectional observational investigation of a nationally recruited cohort of infants with 'simple' and 'complex' congenital disorders of the peripheral visual system. Entry age was 8 to 16 months. Vision level (Near Detection Scale) and non-verbal cognition (sensorimotor understanding, Reynell Zinkin Scales) were assessed...
April 25, 2017: Developmental Medicine and Child Neurology
https://www.readbyqxmd.com/read/28436212/cross-sectional-and-longitudinal-epidemiological-studies-of-internet-gaming-disorder-a-systematic-review-of-the-literature
#6
REVIEW
Satoko Mihara, Susumu Higuchi
AIM: The diagnostic criteria of Internet Gaming Disorder (IGD) have been included in section III of DSM-5. This study aims to systematically review both cross-sectional and longitudinal epidemiological studies of IGD. METHODS: All publications included in PubMed and PsychINFO up to May 2016 were systematically searched to identify cross-sectional studies on prevalence and longitudinal studies of IGD. In the process of identification, articles in non-English languages, and studies focusing solely on the use of gaming were excluded, and those meeting the methodological requirements set by this review were included...
April 24, 2017: Psychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/28435100/montreal-accord-on-patient-reported-outcomes-use-series-paper-5-patient-reported-outcomes-pro-can-be-linked-to-epidemiologic-measures-to-monitor-populations-and-inform-public-health-decisions
#7
Hiroshi Mamiya, Lisa M Lix, William Gardner, Susan J Bartlett, Sara Ahmed, David Buckeridge
BACKGROUND: Comprehensive picture of population health status can be captured by the incorporation of patient reported outcome measures into population health monitoring. OBJECTIVE: To identify current state, opportunities, and future research related to the utilization of patient reported outcome measures for population health monitoring in Canada. DISCUSSIONS: Patient reported outcome measures can help to identify community health needs in public health topics including injury, chronic disease, and communicable disease...
April 20, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28430833/on-the-need-for-quantitative-bias-analysis-in-the-peer-review-process
#8
Matthew P Fox, Timothy L Lash
Peer review is central to the process through which epidemiologists generate evidence to inform public health and medical interventions. Reviewers thereby act as critical gatekeepers to high-quality research. They are asked to carefully consider the validity of the proposed work or research findings by paying careful attention to the methodology and critiquing the importance of the insight gained. However, although many have noted problems with the peer-review system for both manuscripts and grant submissions, few solutions have been proposed to improve the process...
April 18, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28422593/fundamentals-in-biostatistics-for-investigation-in-pediatric-dentistry-part-ii-biostatistical-methods
#9
Amaury Pozos-Guillén, Socorro Ruiz-Rodríguez, Arturo Garrocho-Rangel
The main purpose of the second part of this series was to provide the reader with some basic aspects of the most common biostatistical methods employed in health sciences, in order to better understand the validity, significance and reliability of the results from any article on Pediatric Dentistry. Currently, as mentioned in the first paper, Pediatric Dentists need basic biostatistical knowledge to be able to apply it when critically appraise a dental article during the Evidence-based Dentistry (EBD) process, or when participating in the development of a clinical study with dental pediatric patients...
2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28417200/hpv-related-carcinomas-of-the-head-and-neck-morphologic-features-variants-and-practical-considerations-for-the-surgical-pathologist
#10
REVIEW
Todd M Stevens, Justin A Bishop
Human papillomavirus (HPV)-related oropharyngeal squamous cell carcinoma is a distinct tumor entity with clinical, epidemiologic, genetic, histologic, prognostic, and treatment differences from smoking- and alcohol-related head and neck squamous cell carcinoma. This is now well known by the pathology and medical community. What is not yet widely known is that several emerging variants of HPV-related carcinoma of the head and neck exist apart from the prototypical non-keratinizing morphology. Further, there is currently considerable variation in methodologies used and clinical scenarios in which to test for HPV-related head and neck squamous cell carcinoma, and no standard approach has emerged...
April 17, 2017: Virchows Archiv: An International Journal of Pathology
https://www.readbyqxmd.com/read/28407472/introduction-to-the-centers-for-disease-control-and-prevention-and-healthcare-infection-control-practices-advisory-committee-guideline-for-prevention-of-surgical-site-infection-prosthetic-joint-arthroplasty-section
#11
John Segreti, Javad Parvizi, Elie Berbari, Philip Ricks, Sandra I Berríos-Torres
Peri-prosthetic joint infection (PJI) is a severe complication of total joint arthroplasty that appears to be increasing as more of these procedures are performed. Numerous risk factors for incisional (superficial and deep) and organ/space (e.g., PJI) surgical site infections (SSIs) have been identified. A better understanding and reversal of modifiable risk factors may lead to a reduction in the incidence of incisional SSI and PJI. The Centers for Disease Control and Prevention (CDC) and the Healthcare Infection Control Practices Advisory Committee (HICPAC) recently updated the national Guideline for Prevention of Surgical Site Infection...
April 13, 2017: Surgical Infections
https://www.readbyqxmd.com/read/28407101/early-life-exposures-and-adult-cancer-risk
#12
Megan A Clarke, Corinne E Joshu
Very little is known about the influence of early life exposures on adult cancer risk. The purpose of this narrative review was to summarize the epidemiologic evidence relating early life tobacco use, obesity, diet, and physical activity to adult cancer risk; describe relevant theoretical frameworks and methodological strategies for studying early life exposures; and discuss policies and research initiatives focused on early life. Our findings suggest that in utero exposures may indirectly influence cancer risk by modifying biological pathways associated with carcinogenesis; however, more research is needed to firmly establish these associations...
April 12, 2017: Epidemiologic Reviews
https://www.readbyqxmd.com/read/28405635/using-mendelian-randomization-to-determine-causal-effects-of-maternal-pregnancy-intrauterine-exposures-on-offspring-outcomes-sources-of-bias-and-methods-for-assessing-them
#13
Deborah Lawlor, Rebecca Richmond, Nicole Warrington, George McMahon, George Davey Smith, Jack Bowden, David M Evans
Mendelian randomization (MR), the use of genetic variants as instrumental variables (IVs) to test causal effects, is increasingly used in aetiological epidemiology. Few of the methodological developments in MR have considered the specific situation of using genetic IVs to test the causal effect of exposures in pregnant women on postnatal offspring outcomes. In this paper, we describe specific ways in which the IV assumptions might be violated when MR is used to test such intrauterine effects. We highlight the importance of considering the extent to which there is overlap between genetic variants in offspring that influence their outcome with genetic variants used as IVs in their mothers...
February 14, 2017: Wellcome Open Research
https://www.readbyqxmd.com/read/28405471/mri-based-hip-cartilage-measures-in-osteoarthritic-and-non-osteoarthritic-individuals-a-systematic-review
#14
REVIEW
Hector N Aguilar, Michele C Battié, Jacob L Jaremko
Osteoarthritis is a common hip joint disease, involving loss of articular cartilage. The prevalence and prognosis of hip osteoarthritis have been difficult to determine, with various clinical and radiological methods used to derive epidemiological estimates exhibiting significant heterogeneity. MRI-based methods directly visualise hip joint cartilage, and offer potential to more reliably define presence and severity of osteoarthritis, but have been underused. We performed a systematic review of MRI-based estimates of hip articular cartilage in the general population and in patients with established osteoarthritis, using MEDLINE, EMBASE and SCOPUS current to June 2016, with search terms such as 'hip', 'femoral head', 'cartilage', 'volume', 'thickness', 'MRI', etc...
2017: RMD Open
https://www.readbyqxmd.com/read/28403977/new-approaches-for-assessing-childbirth-positions
#15
D Desseauve, F Pierre, B Gachon, A Decatoire, P Lacouture, L Fradet
BACKGROUND: An overview of labor based only on epidemiological data cannot identify or explain the mechanisms involved in childbirth. Data about the position that women should take in giving birth are discordant. None of the studies of birth positions adequately define or describe them or their biomechanical impact (pelvic orientation, position of the back). The measurement of the effect of one position relative to that of another requires precise definitions of each position and of their maternal biomechanical consequences, as well as safe measurement methods...
February 2017: J Gynecol Obstet Hum Reprod
https://www.readbyqxmd.com/read/28400946/the-state-of-asthma-epidemiology-an-overview-of-systematic-reviews-and-their-quality
#16
Jon Genuneit, Annina M Seibold, Christian J Apfelbacher, George N Konstantinou, Jennifer J Koplin, Stefania La Grutta, Kirsty Logan, Carsten Flohr, Michael R Perkin
BACKGROUND: Recently, we have published an overview of systematic reviews in allergy epidemiology and identified asthma as the most commonly reviewed allergic disease. Building on this work, we aimed to investigate the quality of systematic reviews in asthma using the AMSTAR checklist and to provide a reference for future, more in-depth assessment of the extent of previous knowledge. METHODS: We included all 307 systematic reviews indexed with asthma, including occupational asthma, and/or wheeze from our previous search in PubMed and EMBASE up to December 2014 for systematic reviews on epidemiological research on allergic diseases...
2017: Clinical and Translational Allergy
https://www.readbyqxmd.com/read/28395309/bivariate-left-censored-bayesian-model-for-predicting-exposure-preliminary-analysis-of-worker-exposure-during-the-deepwater-horizon-oil-spill
#17
Caroline Groth, Sudipto Banerjee, Gurumurthy Ramachandran, Mark R Stenzel, Dale P Sandler, Aaron Blair, Lawrence S Engel, Richard K Kwok, Patricia A Stewart
In April 2010, the Deepwater Horizon oil rig caught fire and exploded, releasing almost 5 million barrels of oil into the Gulf of Mexico over the ensuing 3 months. Thousands of oil spill workers participated in the spill response and clean-up efforts. The GuLF STUDY being conducted by the National Institute of Environmental Health Sciences is an epidemiological study to investigate potential adverse health effects among these oil spill clean-up workers. Many volatile chemicals were released from the oil into the air, including total hydrocarbons (THC), which is a composite of the volatile components of oil including benzene, toluene, ethylbenzene, xylene, and hexane (BTEXH)...
January 1, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/28395094/mountain-medical-kits-epidemiology-based-recommendations-and-analysis-of-medical-supplies-carried-by-mountain-climbers-in-colorado
#18
William E Brandenburg, Brian W Locke
Objective: : To provide medical kit recommendations for short mountain wilderness recreation trips (hiking, trekking, backpacking, mountaineering etc.) based on the epidemiology of injury and illness sustained and best treatment guidelines. Additionally, to compare these recommendations to the medical kit contents of mountain climbers in Colorado. Methods: : A primary literature review concerning the epidemiology of injury and illness in mountain wilderness settings was performed...
March 1, 2017: Journal of Travel Medicine
https://www.readbyqxmd.com/read/28392994/medical-big-data-promise-and-challenges
#19
Choong Ho Lee, Hyung-Jin Yoon
The concept of big data, commonly characterized by volume, variety, velocity, and veracity, goes far beyond the data type and includes the aspects of data analysis, such as hypothesis-generating, rather than hypothesis-testing. Big data focuses on temporal stability of the association, rather than on causal relationship and underlying probability distribution assumptions are frequently not required. Medical big data as material to be analyzed has various features that are not only distinct from big data of other disciplines, but also distinct from traditional clinical epidemiology...
March 2017: Kidney Research and Clinical Practice
https://www.readbyqxmd.com/read/28392313/uncomplicated-and-cancer-free-control-probability-ucfcp-a-new-integral-approach-to-treatment-plan-optimization-in-photon-radiation-therapy
#20
Beatriz Sánchez-Nieto, Maite Romero-Expósito, José A Terrón, Francisco Sánchez-Doblado
PURPOSE: Biological treatment plan evaluation does not currently consider second cancer induction from peripheral doses associated to photon radiotherapy. The aim is to propose a methodology to characterize the therapeutic window by means of an integral radiobiological approach, which considers not only Tumour Control Probability (TCP) and Normal Tissue Complication Probability (NTCP) but also Secondary Cancer Probability (SCP). METHODS: Uncomplicated and Cancer-Free Control Probability (UCFCP) function has been proposed assuming a statistically uncorrelated response for tumour and normal tissues...
April 6, 2017: Physica Medica: PM
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