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Time series analysis

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https://www.readbyqxmd.com/read/28430847/invited-commentary-bias-attenuation-and-identification-of-causal-effects-with-multiple-negative-controls
#1
Wang Miao, Eric Tchetgen Tchetgen
In this commentary, we describe several extensions to the interesting and important negative control exposure approach for partial confounding adjustment in time-series analysis proposed by Flanders et al. (Am J Epidemiol. 2012;000(0):000-000). Specifically, by leveraging the availability of exposure time series, we show that under certain additional fairly reasonable assumptions, one can incorporate both past and future exposures as multiple negative control exposures to further attenuate confounding bias...
April 18, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28430328/outcome-of-various-hydrophobic-acrylic-intraocular-lens-implantations-in-children-with-congenital-cataract
#2
Jaspreet Sukhija, Savleen Kaur, Jagat Ram, Sonam Yangzes, Siddharth Madan, Jitender Jinagal
PURPOSE: To evaluate performance of different intraocular lenses (IOLs) after cataract surgery in children aged less than 2 years with regards to rates of visual axis opacification (VAO). METHODS: This was a retrospective chart review of children <2 years of age undergoing cataract surgery with primary posterior capsulotomy, anterior vitrectomy, and IOL over a period of 5 years with minimum follow-up of 1 year at a tertiary care institute. Children with microphthalmos, persistent fetal vasculature, traumatic cataract, aphakia, secondary IOLs, or any other coexisting ocular disease were excluded...
April 13, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28429754/real-time-detection-of-tsunami-ionospheric-disturbances-with-a-stand-alone-gnss-receiver-a-preliminary-feasibility-demonstration
#3
Giorgio Savastano, Attila Komjathy, Olga Verkhoglyadova, Augusto Mazzoni, Mattia Crespi, Yong Wei, Anthony J Mannucci
It is well known that tsunamis can produce gravity waves that propagate up to the ionosphere generating disturbed electron densities in the E and F regions. These ionospheric disturbances can be studied in detail using ionospheric total electron content (TEC) measurements collected by continuously operating ground-based receivers from the Global Navigation Satellite Systems (GNSS). Here, we present results using a new approach, named VARION (Variometric Approach for Real-Time Ionosphere Observation), and estimate slant TEC (sTEC) variations in a real-time scenario...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28428874/population-assessment-using-multivariate-time-series-analysis-a-case-study-of-rockfishes-in-puget-sound
#4
Nick Tolimieri, Elizabeth E Holmes, Gregory D Williams, Robert Pacunski, Dayv Lowry
Estimating a population's growth rate and year-to-year variance is a key component of population viability analysis (PVA). However, standard PVA methods require time series of counts obtained using consistent survey methods over many years. In addition, it can be difficult to separate observation and process variance, which is critical for PVA. Time-series analysis performed with multivariate autoregressive state-space (MARSS) models is a flexible statistical framework that allows one to address many of these limitations...
April 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28428848/modeling-activity-patterns-of-wildlife-using-time-series-analysis
#5
Jindong Zhang, Vanessa Hull, Zhiyun Ouyang, Liang He, Thomas Connor, Hongbo Yang, Jinyan Huang, Shiqiang Zhou, Zejun Zhang, Caiquan Zhou, Hemin Zhang, Jianguo Liu
The study of wildlife activity patterns is an effective approach to understanding fundamental ecological and evolutionary processes. However, traditional statistical approaches used to conduct quantitative analysis have thus far had limited success in revealing underlying mechanisms driving activity patterns. Here, we combine wavelet analysis, a type of frequency-based time-series analysis, with high-resolution activity data from accelerometers embedded in GPS collars to explore the effects of internal states (e...
April 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28427830/liver-transplantation-for-hereditary-hemorrhagic-telangiectasia-a-systematic-review
#6
REVIEW
Emanuele Felli, Pietro Addeo, François Faitot, Gennaro Nappo, Constantin Oncioiu, Philippe Bachellier
AIM: To evaluate the indications, timing and results of liver transplantation in patients affected by hereditary hemorrhagic telangiectasia (HHT), by undertaking a systematic review of the current literature. METHODS: Electronic bibliographical databases were searched on MEDLINE and Pubmed according to the PRISMA criteria. A total of 58 articles were initially found, 11 have been excluded because of single center series later included in the European Liver transplant Registry (ELTR), already reported in this study...
April 17, 2017: HPB: the Official Journal of the International Hepato Pancreato Biliary Association
https://www.readbyqxmd.com/read/28427353/assessing-the-impact-of-natural-policy-experiments-on-socioeconomic-inequalities-in-health-how-to-apply-commonly-used-quantitative-analytical-methods
#7
Yannan Hu, Frank J van Lenthe, Rasmus Hoffmann, Karen van Hedel, Johan P Mackenbach
BACKGROUND: The scientific evidence-base for policies to tackle health inequalities is limited. Natural policy experiments (NPE) have drawn increasing attention as a means to evaluating the effects of policies on health. Several analytical methods can be used to evaluate the outcomes of NPEs in terms of average population health, but it is unclear whether they can also be used to assess the outcomes of NPEs in terms of health inequalities. The aim of this study therefore was to assess whether, and to demonstrate how, a number of commonly used analytical methods for the evaluation of NPEs can be applied to quantify the effect of policies on health inequalities...
April 20, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28426423/the-discovery-of-acanthocephalans-parasitizing-chaetognaths
#8
Horacio Lozano-Cobo, Jaime Gómez-Gutiérrez, Carmen Franco-Gordo, María Del Carmen Gómez Del Prado-Rosas
A comprehensive literature review shows that 12 types of pathogens, micropredators and parasites are reported to interact with chaetognaths, mostly digenean trematodes, cestodes and nematodes larval stages. Through analysis of 78,152 chaetognaths from a monthly zooplankton time series (Jan 1996-Dec 1998) collected in the Mexican Central Pacific twelve acanthocephalan larvae parasitizing chaetognaths were discovered. This is the first record of an acanthocephalan parasitizing chaetognaths, raising to 13 the types of symbionts known to interact with them (excluding predators)...
June 1, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/28426243/analysis-of-2019-patients-undergoing-revision-anterior-cruciate-ligament-reconstruction-from-a-community-based-registry
#9
Afshin Arianjam, Maria C S Inacio, Tadashi T Funahashi, Gregory B Maletis
BACKGROUND: Knowledge of patient characteristics, surgical fixation, graft choice, outcomes, and concurrent injuries of revision anterior cruciate ligament reconstruction (ACLR) is limited. PURPOSE: To describe the current cohort of revision ACLR captured by a community registry and the outcomes observed in the registered patients. STUDY DESIGN: Case series; Level of evidence, 4. METHODS: Patients who underwent revision ACLR registered between February 2005 and June 2014, by 200 surgeons in 46 hospitals, were evaluated...
April 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28424042/the-effect-of-a-new-angiographic-imaging-technology-on-radiation-dose-in-visceral-embolization-procedures
#10
Frederic Baumann, Constantino Peña, Roman Kloeckner, Barry T Katzen, Ripal Gandhi, James B Benenati
PURPOSE: To evaluate the impact of a new angiographic imaging technology on radiation dose during visceral embolization procedures involving both fluoroscopy and digital subtraction angiography. MATERIAL AND METHODS: A retrospective analysis from a single-center consecutive series of patients was performed comparing 2 angiographic imaging systems. The AlluraClarity (CIQ; Philips Healthcare, Best, the Netherlands) was used in 100 patients (n = 59 male, mean age: 70...
May 2017: Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28423752/a-decision-support-system-for-cardiac-disease-diagnosis-based-on-machine-learning-methods
#11
Arash Gharehbaghi, Maria Lindén, Ankica Babic
This paper proposes a decision support system for screening pediatric cardiac disease in primary healthcare centres relying on the heart sound time series analysis. The proposed system employs our processing method which is based on the hidden Markov model for extracting appropriate information from the time series. The binary output resulting from the method is discriminative for the two classes of time series existing in our databank, corresponding to the children with heart disease and the healthy ones. A total 90 children referrals to a university hospital, constituting of 55 healthy and 35 children with congenital heart disease, were enrolled into the study after obtaining the informed consent...
2017: Studies in Health Technology and Informatics
https://www.readbyqxmd.com/read/28423525/the-combination-of-circulating-long-noncoding-rnas-ak001058-inhba-as1-mir4435-2hg-and-cebpa-as1-fragments-in-plasma-serve-as-diagnostic-markers-for-gastric-cancer
#12
Dong Ke, Hanwei Li, Yi Zhang, Yinghong An, Hanjiang Fu, Xuedong Fang, Xiaofei Zheng
BACKGROUND: Suitable diagnostic markers for cancers are urgently required in clinical practice. Long non-coding RNAs, which have been reported in many cancer types, are a potential new class of biomarkers for tumor diagnosis. RESULTS: Five lncRNAs, including AK001058, INHBA-AS1, MIR4435-2HG, UCA1 and CEBPA-AS1 were validated to be increased in gastric cancer tissues. Furthermore, we found that plasma level of these five lncRNAs were significantly higher in gastric cancer patients compared with normal controls...
March 28, 2017: Oncotarget
https://www.readbyqxmd.com/read/28423459/breaks-in-modis-time-series-portend-vegetation-change-verification-using-long-term-data-in-an-arid-grassland-ecosystem
#13
Dawn M Browning, Jonathan J Maynard, Jason W Karl, Debra C Peters
Frequency and severity of extreme climatic events are forecast to increase in the 21st century. Predicting how managed ecosystems may respond to climatic extremes is intensified by uncertainty associated with knowing when, where, and how long effects of extreme events will be manifest in an ecosystem. In water-limited ecosystems with high inter-annual variability in rainfall, it is important to be able to distinguish responses that result from seasonal fluctuations in rainfall from long-term directional increases or decreases in precipitation...
April 19, 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28423139/trend-of-leprosy-in-individuals-under-the-age-of-15-in-mato-grosso-brazil-2001-2013
#14
Bruna Hinnah Borges Martins de Freitas, Denise da Costa Boamorte Cortela, Silvana Margarida Benevides Ferreira
OBJECTIVE: To identify the historical trend of leprosy epidemiological indicators in individuals under the age of 15 in the state of Mato Grosso. METHODS: Descriptive study with trend analysis of leprosy indicators in individuals under the age of fifteen registered in the Mato Grosso's System for Notifiable Diseases between 2001 and 2013. We used the Prais-Winsten procedure for analyzing generalized linear regression at a significance level of 5%. We considered as increasing time series when the annual percent change was positive, decreasing when negative and stationary when there was no significant difference between its value and zero...
April 10, 2017: Revista de Saúde Pública
https://www.readbyqxmd.com/read/28423068/suicide-and-meteorological-factors-in-s%C3%A3-o-paulo-brazil-1996-2011-a-time-series-analysis
#15
Daniel H Bando, Chei T Teng, Fernando M Volpe, Eduardo de Masi, Luiz A Pereira, Alfésio L Braga
Objective: Considering the scarcity of reports from intertropical latitudes and the Southern Hemisphere, we aimed to examine the association between meteorological factors and suicide in São Paulo. Method: Weekly suicide records stratified by sex were gathered. Weekly averages for minimum, mean, and maximum temperature (°C), insolation (hours), irradiation (MJ/m2), relative humidity (%), atmospheric pressure (mmHg), and rainfall (mm) were computed. The time structures of explanatory variables were modeled by polynomial distributed lag applied to the generalized additive model...
April 13, 2017: Revista Brasileira de Psiquiatria
https://www.readbyqxmd.com/read/28422736/identification-of-map-kinase-pathways-as-therapeutic-targets-in-gallbladder-carcinoma-using-targeted-parallel-sequencing
#16
Mengdan Li, Lihong Chen, Yiping Qu, Fang Sui, Qi Yang, Meiju Ji, Bingyin Shi, Mingwei Chen, Peng Hou
The aim of this study was to profile somatic mutation spectrum in gallbladder cancers (GBCs), and determine the role of MAP kinase pathway in GBC by a series of in vitro and in vivo studies. We performed targeted massively parallel sequencing of DNA isolated from GBCs and matched blood from 14 GBC patients to search for mutations in 504 genes commonly altered in human cancers. We identified recurrent mutations enriched in several major signaling pathways including MAP kinase, Wnt/β-catenin and NF-κB pathways...
March 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/28421177/variation-in-population-vulnerability-to-heat-wave-in-western-australia
#17
Jianguo Xiao, Tony Spicer, Le Jian, Grace Yajuan Yun, Changying Shao, John Nairn, Robert J B Fawcett, Andrew Robertson, Tarun Stephen Weeramanthri
Heat waves (HWs) have killed more people in Australia than all other natural hazards combined. Climate change is expected to increase the frequency, duration, and intensity of HWs and leads to a doubling of heat-related deaths over the next 40 years. Despite being a significant public health issue, HWs do not attract the same level of attention from researchers, policy makers, and emergency management agencies compared to other natural hazards. The purpose of the study was to identify risk factors that might lead to population vulnerability to HW in Western Australia (WA)...
2017: Frontiers in Public Health
https://www.readbyqxmd.com/read/28420928/road-traffic-crash-related-injured-and-fatal-victims-in-karachi-from-2007-to-2014-a-time-series-analysis
#18
Rashid Jooma, Masood Ali Shaikh
Injuries and deaths due to road traffic crashes (RTC) are major public health concern. The Road Traffic Injury Research and Prevention Center, collects RTC data on injuries and fatalities from five emergency departments in Karachi. Data generating process (DGP) for RTC from 2007 to 2014, for monthly number of fatal and injured victims were analyzed using autoregressive integrated moving average and vector auto regression, time series models. Results provide strong evidence that the DGP for the current levels of the number of fatalities and injured owing to RTCs are significantly influenced by the own past history of the two series...
April 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28420542/improving-prehospital-trauma-care-in-rwanda-through-continuous-quality-improvement-an-interrupted-time-series-analysis
#19
John W Scott, Jeanne D'Arc Nyinawankusi, Samuel Enumah, Rebecca Maine, Eric Uwitonze, Yihan Hu, Ignace Kabagema, Jean Claude Byiringiro, Robert Riviello, Sudha Jayaraman
INTRODUCTION: Injury is a major cause of premature death and disability in East Africa, and high-quality pre-hospital care is essential for optimal trauma outcomes. The Rwandan pre-hospital emergency care service (SAMU) uses an electronic database to evaluate and optimize pre-hospital care through a continuous quality improvement programme (CQIP), beginning March 2014. MATERIALS AND METHODS: The SAMU database was used to assess pre-hospital quality metrics including supplementary oxygen for hypoxia (O2), intravenous fluids for hypotension (IVF), cervical collar placement for head injuries (c-collar), and either splinting (splint) or administration of pain medications (pain) for long bone fractures...
April 5, 2017: Injury
https://www.readbyqxmd.com/read/28420035/prospective-series-of-reconstruction-of-complex-composite-mandibulectomy-defects-with-double-island-free-fibula-flap
#20
Edward I Chang, Peirong Yu
BACKGROUND: A double island free fibula (DIFF) flap can be used for reconstruction of through-and-through or complex mandibulectomy defects, but prospective studies are lacking. METHODS: Prospective analysis of all double skin paddle fibula flaps performed from 2010 to 2016. RESULTS: Overall, 16 patients underwent reconstruction with a DIFF flap (average age: 59.1 years). One patient, who underwent a DIFF flap and developed osteoradionecrosis, requiring a second flap...
April 18, 2017: Journal of Surgical Oncology
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