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likelihood ratios test

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https://www.readbyqxmd.com/read/28226807/detection-of-control-or-idle-state-with-a-likelihood-ratio-test-in-asynchronous-ssvep-based-brain-computer-interface-systems
#1
Lenis M Merino, Tapsya Nayak, Garrett Hall, Daniel J Pack, Yufei Huang, Lenis M Merino, Tapsya Nayak, Garrett Hall, Daniel J Pack, Yufei Huang, Yufei Huang, Lenis M Merino, Garrett Hall, Daniel J Pack, Tapsya Nayak
We consider the detection of the control or idle state in an asynchronous Steady-state visually evoked potential (SSVEP)-based brain computer interface system. We propose a likelihood ratio test using Canonical Correlation Analysis (CCA) scores calculated from the EEG measurements. The test exploits the state-specific distributions of CCA scores. The algorithm was tested on offline measurements from 42 participants and the results should a significant improvement in detection error rate over the support vector machine classifier...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226253/modeling-single-vehicle-run-off-road-crash-severity-in-rural-areas-accounting-for-unobserved-heterogeneity-and-age-difference
#2
Linfeng Gong, Wei David Fan
This study investigates factors that significantly contribute to the severity of driver injuries resulting from single-vehicle run-off-road (SV ROR) crashes. A mixed logit model approach is employed to explore the potential unobserved heterogeneous effects associated with each age group: young (ages 16-24), middle-aged (ages 25-65), and older drivers (ages over 65). Likelihood ratio tests indicated that the development of separate injury severity models for each age group is statistically superior to estimating a single model using all data...
February 19, 2017: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/28225162/mandibular-position-and-movements-suitability-for-diagnosis-of-sleep-apnoea
#3
Jean-Benoit Martinot, Jean-Christian Borel, Valérie Cuthbert, Hervé Jean-Pierre Guénard, Stéphane Denison, Philip E Silkoff, David Gozal, Jean-Louis Pepin
BACKGROUND AND OBJECTIVE: Mandibular movements (MMs) and position during sleep reflect respiratory efforts related to increases in upper airway resistance and micro-arousals. The study objective was to assess whether MM identifies sleep-disordered breathing (SDB) in patients with moderate to high pre-test probability. METHODS: This was a prospective study of 87 consecutive patients referred for an in-laboratory sleep test. Magnetometer-derived MM signals were incorporated into standard polysomnography (PSG)...
November 6, 2016: Respirology: Official Journal of the Asian Pacific Society of Respirology
https://www.readbyqxmd.com/read/28224095/culturally-adapted-pictorial-screening-tool-for-autism-spectrum-disorder-a-new-approach
#4
Hemamali Perera, Kamal Chandima Jeewandara, Sudarshi Seneviratne, Chandima Guruge
AIM: To assess the performance of a newly designed, culturally adapted screening tool for autism spectrum disorder (ASD). METHODS: Items for the screening tool were modeled from already documented checklists and diagnostic criteria for ASD. Each item in text was paired with a photograph that illustrated the written content, which was in the 2 main local languages. The final product had 21 items and was named the pictorial autism assessment schedule (PAAS). Performance of PAAS was tested on a clinical sample of 18-48 mo old children, diagnosis naïve, presenting with developmental deficits...
February 8, 2017: World Journal of Clinical Pediatrics
https://www.readbyqxmd.com/read/28223711/identification-of-novel-cancer-therapeutic-targets-using-a-designed-and-pooled-shrna-library-screen
#5
David Oliver, Hao Ji, Piaomu Liu, Alexander Gasparian, Ellen Gardiner, Samuel Lee, Adrian Zenteno, Lillian O Perinskaya, Mengqian Chen, Phillip Buckhaults, Eugenia Broude, Michael D Wyatt, Homayoun Valafar, Edsel Peña, Michael Shtutman
Targeted cancer therapeutics aim to exploit tumor-specific, genetic vulnerabilities specifically affecting neoplastic cells without similarly affecting normal cells. Here we performed sequencing-based screening of an shRNA library on a panel of cancer cells of different origins as well as normal cells. The shRNA library was designed to target a subset of genes previously identified using a whole genome screening approach. This focused shRNA library was infected into cells followed by analysis of enrichment and depletion of the shRNAs over the course of cell proliferation...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28222775/modification-of-the-association-between-recreational-physical-activity-and-survival-after-breast-cancer-by-promoter-methylation-in-breast-cancer-related-genes
#6
Lauren E McCullough, Jia Chen, Yoon Hee Cho, Nikhil K Khankari, Patrick T Bradshaw, Alexandra J White, Susan L Teitelbaum, Mary Beth Terry, Alfred I Neugut, Hanina Hibshoosh, Regina M Santella, Marilie D Gammon
BACKGROUND: Mechanisms underlying the inverse association between physical activity and survival after breast cancer are unresolved, but DNA methylation may play a role. We hypothesized that promoter methylation of breast cancer-related genes, as well as global methylation, may modify the association between prediagnostic recreational physical activity (RPA) and breast cancer mortality. METHODS: Using a population-based sample of 1254 women diagnosed with first primary breast cancer, we examined modification of the RPA-mortality association by gene-specific promoter methylation and global methylation...
February 21, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/28222769/plasticity-of-host-selection-by-malaria-vectors-of-papua-new-guinea
#7
John B Keven, Lisa Reimer, Michelle Katusele, Gussy Koimbu, Rebecca Vinit, Naomi Vincent, Edward Thomsen, David R Foran, Peter A Zimmerman, Edward D Walker
BACKGROUND: Host selection is an important determinant of vectorial capacity because malaria transmission increases when mosquitoes feed more on humans than non-humans. Host selection also affects the outcome of long-lasting insecticidal nets (LLIN). Despite the recent nationwide implementation of LLIN-based malaria control program in Papua New Guinea (PNG), little is known about the host selection of the local Anopheles vectors. This study investigated the host selection of Anopheles vectors in PNG...
February 21, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28222676/meta-analysis-of-the-utility-of-culture-biopsy-and-direct-koh-examination-for-the-diagnosis-of-onychomycosis
#8
Verónica Velasquez-Agudelo, Jaiberth Antonio Cardona-Arias
BACKGROUND: Onychomycosis is a highly prevalent disease worldwide. There is no standard test for its diagnosis, which remains costly, wasteful, and is sometimes delayed. The diagnostic tests for this disease are few and discordant. The objective was to evaluate the diagnostic validity, performance, and accuracy of culture, nail clipping with Periodic Acid-Schiff -PAS- staining (biopsy), and direct potassium hydroxide (KOH) examination for the study of onychomycosis. METHODS: A systematic review was conducted via meta-analysis using 5 databases and 21 search strategies...
February 22, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28222582/anthropometric-and-performance-measures-to-study-talent-detection-in-youth-volleyball
#9
Giovanni Melchiorri, Valerio Viero, Tamara Triossi, Giuseppe Annino, Elvira Padua, Virginia Tancredi
BACKGROUND: The aim of this work was to study anthropometric and performance measurements in 60 young male volleyball players (YV) and 60 youth not active in the sport (YNA) to assess which of these would be more useful to study the characteristics of potential performers. METHODS: Eight measures to assess anthropometric characteristics, six performance measures and two tests for joint mobility were used. Also relative age and level of maturation were assessed. RESULTS: The anthropometric variables, relative age and level of maturation measured did not show statistically significant differences between groups...
February 21, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28221250/factors-associated-with-discontinuation-of-anti-tnf-inhibitors-among-persons-with-ibd-a-population-based-analysis
#10
Laura E Targownik, Aruni Tennakoon, Stella Leung, Lisa M Lix, Zoann Nugent, Harminder Singh, Charles N Bernstein
INTRODUCTION: Antitumor necrosis factor (anti-TNF) medications are known to be highly efficacious in persons with moderate-to-severe inflammatory bowel disease (IBD). There is a paucity of data from population-based sources to elucidate persistence with these medications in the general population of IBD. Discontinuation of anti-TNF therapy is a marker of lack of effectiveness, intolerance, and patient/physician practice preferences. METHODS: We identified all persons with IBD in Manitoba who were dispensed infliximab (IFX) and adalimumab (ADA) between 2001 and 2014...
March 2017: Inflammatory Bowel Diseases
https://www.readbyqxmd.com/read/28216720/biostatistics-series-module-7-the-statistics-of-diagnostic-tests
#11
Avijit Hazra, Nithya Gogtay
Crucial therapeutic decisions are based on diagnostic tests. Therefore, it is important to evaluate such tests before adopting them for routine use. Although things such as blood tests, cultures, biopsies, and radiological imaging are obvious diagnostic tests, it is not to be forgotten that specific clinical examination procedures, scoring systems based on physiological or psychological evaluation, and ratings based on questionnaires are also diagnostic tests and therefore merit similar evaluation. In the simplest scenario, a diagnostic test will give either a positive (disease likely) or negative (disease unlikely) result...
January 2017: Indian Journal of Dermatology
https://www.readbyqxmd.com/read/28216190/evaluation-of-two-vaccine-education-interventions-to-improve-pertussis-vaccination-among-pregnant-african-american-women-a-randomized-controlled-trial
#12
Jennifer L Kriss, Paula M Frew, Marielysse Cortes, Fauzia A Malik, Allison T Chamberlain, Katherine Seib, Lisa Flowers, Kevin A Ault, Penelope P Howards, Walter A Orenstein, Saad B Omer
BACKGROUND: Vaccination coverage with tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis (Tdap) vaccine in pregnancy or immediately postpartum has been low. Limited data exist on rigorously evaluated interventions to increase maternal vaccination, including Tdap. Tailored messaging based on the Elaboration Likelihood Model (ELM) framework has been successful in improving uptake of some public health interventions. We evaluated the effect of two ELM-based vaccine educational interventions on Tdap vaccination among pregnant African American women, a group of women who tend to have lower vaccine uptake compared with other groups...
February 16, 2017: Vaccine
https://www.readbyqxmd.com/read/28214369/diagnostic-accuracy-of-history-physical-exam-laboratory-tests-and-point-of-care-ultrasound-for-pediatric-acute-appendicitis-in-the-emergency-department-a-systematic-review-and-meta-analysis
#13
Roshanak Benabbas, Mark Hanna, Jay Shah, Richard Sinert
BACKGROUND: Acute appendicitis (AA) is the most common surgical emergency in children. Accurate and timely diagnosis is crucial but challenging due to atypical presentations and the inherent difficulty of obtaining a reliable history and physical examination in younger children. OBJECTIVES: To determine the utility of history, physical exam, laboratory tests, Pediatric Appendicitis Score (PAS) and Emergency Department-Point-of-Care Ultrasound (ED-POCUS) in the diagnosis of AA in ED pediatric patients...
February 18, 2017: Academic Emergency Medicine: Official Journal of the Society for Academic Emergency Medicine
https://www.readbyqxmd.com/read/28211963/a-parametric-model-of-the-brain-vascular-system-for-estimation-of-the-arterial-input-function-aif-at-the-tissue-level
#14
Siamak P Nejad-Davarani, Hassan Bagher-Ebadian, James R Ewing, Douglas C Noll, Tom Mikkelsen, Michael Chopp, Quan Jiang
In this paper, we introduce a novel model of the brain vascular system, which is developed based on laws of fluid dynamics and vascular morphology. This model is used to address dispersion and delay of the arterial input function (AIF) at different levels of the vascular structure and to estimate the local AIF in DCE images. We developed a method based on the simplex algorithm and Akaike information criterion to estimate the likelihood of the contrast agent concentration signal sampled in DCE images belonging to different layers of the vascular tree or being a combination of different signal levels from different nodes of this structure...
February 17, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28203279/a-noninvasive-diagnostic-model-to-assess-nonalcoholic-hepatic-steatosis-in-patients-with-chronic-hepatitis-b
#15
Hongjie Ou, Shaohang Cai, Ying Liu, Muye Xia, Jie Peng
OBJECTIVE: The objective of this study was to develop a noninvasive diagnostic test for nonalcoholic hepatic steatosis in patients with chronic hepatitis B (CHB) by using routinely available clinical markers. METHODS: A retrospective study of patients with CHB, with or without hepatic steatosis (fatty change) who were diagnosed with controlled attenuation parameter (CAP) measured by transient elastography were included. Patient information was analyzed on lifestyle; laboratory tests, including serum lipid levels; blood pressure; blood uric acid; and medical history of type 2 diabetes mellitus (T2DM)...
February 2017: Therapeutic Advances in Gastroenterology
https://www.readbyqxmd.com/read/28201829/impact-of-continuous-two-team-approach-in-autologous-breast-reconstruction
#16
A J Bauermeister, A Zuriarrain, M Newman, S A Earle, M A Medina
Background Autologous breast reconstruction has been noted in the literature to provide superior aesthetic outcomes and patient satisfaction. Additionally, free perforator flap tissue transfer has the potential for lower abdominal donor site morbidity. However, it has been noted that the percentage of women who are undergoing autologous breast reconstruction in the United States is decreasing. Factors related to the technical difficulty, prolonged operative times, and decreasing reimbursement have been implicated as the causes...
February 15, 2017: Journal of Reconstructive Microsurgery
https://www.readbyqxmd.com/read/28197862/influences-of-economic-social-and-cultural-marginalization-on-the-association-between-alcohol-use-and-sexual-risk-among-formerly-incarcerated-latino-men
#17
Miguel Muñoz-Laboy, Omar Martínez, Vincent Guilamo-Ramos, Jeffrey Draine, Karin Eyrich Garg, Ethan Levine, Alexandra Ripkin
Formerly incarcerated Latino men (FILM) have been significantly impacted by the HIV/AIDS and alcohol abuse epidemics in the United States. In this analysis, we examine the role of social, economic and cultural marginalization in the likelihood of alcohol-related sexual risk taking behavior among FILM. We recruited a non-random sample of FILM, ages 18-49 (n = 259). We performed logistic regression modeling to test four hypotheses examining the direct and moderating effects of socio-cultural factors. Drinking before sex was strongly associated with high likelihood of condomless intercourse (adjusted odds ratio, AOR = 2...
February 15, 2017: Journal of Immigrant and Minority Health
https://www.readbyqxmd.com/read/28197269/measuring-b-type-natriuretic-peptide-from-capillary-blood-or-venous-sample-is-it-the-same
#18
Renato De Vecchis, Carmelina Ariano
BACKGROUND: In recent years, several systems have been implemented to achieve quick and non-invasive measurements of B-type natriuretic peptide (BNP). Among them, Alere(TM) Heart Check (AHC) BNP test represents the most recent advancement. It is a rapid point-of-care (POC) immunoassay, projected for measuring BNP directly from a capillary whole blood sample. This study aimed at comparing the analytical and clinical performances of this new POC to our reference method (Abbott Architect System)...
April 2016: Cardiology Research
https://www.readbyqxmd.com/read/28195664/an-adaptive-model-for-rapid-and-direct-estimation-of-extravascular-extracellular-space-in-dynamic-contrast-enhanced-mri-studies
#19
Azimeh N V Dehkordi, Alireza Kamali-Asl, James R Ewing, Ning Wen, Indrin J Chetty, Hassan Bagher-Ebadian
Extravascular extracellular space (ve ) is a key parameter to characterize the tissue of cerebral tumors. This study introduces an artificial neural network (ANN) as a fast, direct, and accurate estimator of ve from a time trace of the longitudinal relaxation rate, ΔR1 (R1  = 1/T1 ), in DCE-MRI studies. Using the extended Tofts equation, a set of ΔR1 profiles was simulated in the presence of eight different signal to noise ratios. A set of gain- and noise-insensitive features was generated from the simulated ΔR1 profiles and used as the ANN training set...
February 14, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28194837/comparison-of-thyroid-function-tests-and-blood-count-in-pregnant-women-with-versus-without-gestational-diabetes-mellitus
#20
Suheyla Gorar, Gul Babacan Abanonu, Aysel Uysal, Onur Erol, Aysun Unal, Seyit Uyar, Ayhan Hilmi Cekin
AIM: The aim of this study was to compare thyroid function and complete blood count parameters in pregnant women with versus without gestational diabetes mellitus (GDM). METHODS: A total of 269 pregnant women patients with (n = 110, GDM group) or without (n = 159, non-GDM group) GDM were included in this study. Data on age, rate of cesarean section, birthweight of neonate, hemogram, and thyroid function tests were collected. Multivariate analysis was performed to determine factors predicting increased risk of GDM...
February 13, 2017: Journal of Obstetrics and Gynaecology Research
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