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Logistic modeling

Koji M Nishiguchi, Yu Yokoyama, Yusuke Fujii, Kosuke Fujita, Yusuke Tomiyama, Ryo Kawasaki, Toshinori Furukawa, Fumiko Ono, Nobuhiro Shimozawa, Mutsumi Togo, Michihiro Suzuki, Toru Nakazawa
Age-dependent formation of macular drusen caused by the focal accumulation of extracellular deposits beneath the retinal pigment epithelium precede the development of age-related macular degeneration (AMD), one of the leading causes of blindness worldwide. It is established that inflammation contributes to the pathogenesis of drusen and AMD. However, development of a preemptive therapeutic strategy targeting macular drusen and AMD has been impeded by the lack of relevant animal models because most laboratory animals lack macula, an anatomic feature present only in humans and a subset of monkeys...
2016: PloS One
Virginia Lope, Nerea Fernández de Larrea, Beatriz Pérez-Gómez, Vicente Martín, Victor Moreno, Laura Costas, Federico Longo, José Juan Jiménez-Moleón, Javier Llorca, Nieves Ascunce, Rosana Peiró-Pérez, Jone M Altzibar, Adonina Tardón, Juan Alguacil, Carmen Navarro, Ángeles Sierra, Ana Belén Vega, Amaya Villafañe, Gemma Castaño-Vinyals, Manolis Kogevinas, Marina Pollán, Nuria Aragonés
BACKGROUND: Sex hormones play a role in gastric cancer and colorectal cancer etiology, however, epidemiological evidence is inconsistent. This study examines the influence of menstrual and reproductive factors over the risk of both tumors. METHODS: In this case-control study 128 women with gastric cancer and 1293 controls, as well as 562 female and colorectal cancer cases and 1605 controls were recruited in 9 and 11 Spanish provinces, respectively. Population controls were frequency matched to cases by age and province...
2016: PloS One
Saad Mohamad, Abdelhamid Bouchachia, Moamar Sayed-Mouchaweh
Active learning (AL) is a promising way to efficiently build up training sets with minimal supervision. A learner deliberately queries specific instances to tune the classifier's model using as few labels as possible. The challenge for streaming is that the data distribution may evolve over time, and therefore the model must adapt. Another challenge is the sampling bias where the sampled training set does not reflect the underlying data distribution. In the presence of concept drift, sampling bias is more likely to occur as the training set needs to represent the whole evolving data...
October 21, 2016: IEEE Transactions on Neural Networks and Learning Systems
Jamie Perin, John S Preisser
Alternating logistic regressions is an estimating equations procedure used to model marginal means of correlated binary outcomes while simultaneously specifying a within-cluster association model for log odds ratios of outcome pairs. A recent generalization of alternating logistic regressions, known as orthogonalized residuals, is extended to incorporate finite sample adjustments in the estimation of the log odds ratio model parameters for when there is a moderately small number of clusters. Bias adjustments are made both in the sandwich variance estimators and in the estimating equations for the association parameters...
October 24, 2016: Biometrics
Eliza C Miller, Hajere J Gatollari, Gloria Too, Amelia K Boehme, Lisa Leffert, Mitchell S V Elkind, Joshua Z Willey
Importance: Older age is associated with increased risk of pregnancy-associated stroke (PAS). Data are limited on age-specific incidence ratios of PAS compared with stroke risk in nonpregnant women. Objectives: To assess the risk of stroke by age group in pregnant and postpartum women compared with their nonpregnant contemporaries and to compare risk factors across age groups in the exposed (pregnant/postpartum) and unexposed (nonpregnant) populations. Design, Setting, and Participants: International Classification of Diseases, Ninth Revision, billing codes from the calendar year 2003-2012 New York State Department of Health inpatient database and population data were used to identify all women aged 12 to 55 years with cerebrovascular events, including transient ischemic attack, ischemic and hemorrhagic stroke, cerebral venous thrombosis, and nonspecified PAS...
October 24, 2016: JAMA Neurology
Zhenjie Wang, Gong Chen, Chao Guo, Lihua Pang, Xiaoying Zheng
Socioeconomic inequalities associated with multiple disabilities have not been explored in China. This is the first study to explore changes in multiple disabilities among persons aged 15-64 years in China. Data were derived from the 1987 and 2006 China National Sample Surveys on Disability, which are nationally representative population-based surveys. Both surveys used multistage, stratified, cluster random sampling with probability proportional to size to derive nationally representative samples. We used standard weighting procedures to construct sample weights considering the multistage stratified cluster sampling survey scheme...
October 21, 2016: International Journal of Environmental Research and Public Health
Ricardo Dias de Castro, Marianne de Lucena Rangel, Marcos André Azevedo da Silva, Brunna Thaís Lucwu de Lucena, Alessandro Leite Cavalcanti, Paulo Rogério Ferreti Bonan, Julyana de Araújo Oliveira
The Specialized Dental Clinics (SDCs) represent the first government initiative in Latin America aimed at providing specialized oral health services. This study sought to evaluate the organizational accessibility to specialized oral health care services in Brazil and to understand the factors that may be associated with accessibility from the user's perspective. This epidemiological, cross-sectional and quantitative study was conducted by means of interviews with individuals who sought specialized public oral health services in the city of João Pessoa, Paraíba, Brazil, and consisted of a sample of 590 individuals...
October 19, 2016: International Journal of Environmental Research and Public Health
Nancy M Heddle, Richard J Cook, Donald M Arnold, Yang Liu, Rebecca Barty, Mark A Crowther, P J Devereaux, Jack Hirsh, Theodore E Warkentin, Kathryn E Webert, David Roxby, Magdalena Sobieraj-Teague, Andrea Kurz, Daniel I Sessler, Priscilla Figueroa, Martin Ellis, John W Eikelboom
Background Randomized, controlled trials have suggested that the transfusion of blood after prolonged storage does not increase the risk of adverse outcomes among patients, although most of these trials were restricted to high-risk populations and were not powered to detect small but clinically important differences in mortality. We sought to find out whether the duration of blood storage would have an effect on mortality after transfusion in a general population of hospitalized patients. Methods In this pragmatic, randomized, controlled trial conducted at six hospitals in four countries, we randomly assigned patients who required a red-cell transfusion to receive blood that had been stored for the shortest duration (short-term storage group) or the longest duration (long-term storage group) in a 1:2 ratio...
October 24, 2016: New England Journal of Medicine
Martin Bohner, Sabrina Streipert
In this paper, we establish the exploitation of a single population modeled by the Beverton--Holt difference equation with periodic coefficients. We begin our investigation with the harvesting of a single autonomous population with logistic growth and show that the harvested logistic equation with periodic coefficients has a unique positive periodic solution which globally attracts all its solutions. Further, we approach the investigation of the optimal harvesting policy that maximizes the annual sustainable yield in a novel and powerful way; it serves as a foundation for the analysis of the exploitation of the discrete population model...
August 1, 2016: Mathematical Biosciences and Engineering: MBE
Jalie A Tucker, JeeWon Cheong, Susan D Chandler, Brice H Lambert, Brittney Pietrzak, Heather Kwok, Susan L Davies
BACKGROUND: As interventions have expanded beyond clinical treatment to include brief interventions for persons with less severe alcohol problems, predicting who can achieve stable moderation drinking has gained importance. Recent behavioral economic (BE) research on natural recovery has shown that active problem drinkers who allocate their monetary expenditures on alcohol and saving for the future over longer time horizons tend to have better subsequent recovery outcomes, including maintenance of stable moderation drinking...
October 24, 2016: Alcoholism, Clinical and Experimental Research
R F Schlenk, F Stegelmann, A Reiter, E Jost, N Gattermann, H Hebart, C Waller, A Hochhaus, U Platzbecker, P Schafhausen, I W Blau, W Verbeek, F H Heidel, M Werner, H Kreipe, V Teleanu, A Benner, H Döhner, M Grießhammer, K Döhner
MPN-associated myelofibrosis is a myeloproliferative neoplasm characterized by bone marrow fibrosis, cytopenias, splenomegaly and constitutional symptoms. Pomalidomide, an immune-modifying drug, is reported to improve anaemia and thrombocytopenia in some patients with MPN-associated myelofibrosis. We designed a phase-2 study of pomalidomide in patients with MPN-associated myelofibrosis and anaemia and/or thrombocytopenia and/or neutropenia. Subjects received pomalidomide 2.0 mg/d in cohort-1 (n=38) or 0.5 mg/d in cohort-2 (n=58)...
October 24, 2016: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
Andrés Palacio Chaverra
OBJECTIVE(S): Colombia has the third largest black population in the Americas after Brazil and the USA. In 2005 mortality rate under 5 in Colombia was 21.5 per 1000, with a reduction of 82% between 2005 and 1955. That rate is not in line with rates for Cuba (6.8), Chile (9.1) or Costa Rica (10.4). Here we aim to provide evidence that a further reduction of child mortality relates to the unspoken racial gap in a pioneering country in family planning and praised in the 2000 WHO report as having the world's fairest health care reform in terms of coverage and financial access...
October 24, 2016: Ethnicity & Health
Brian Downer, Cesar González-González, Noreen Goldman, Anne R Pebley, Rebeca Wong
OBJECTIVE: The increased risk for poor physical and mental health outcomes for older parents in Mexico who have an adult child living in the United States may contribute to an increased risk for cognitive impairment in this population. The objective of this study was to examine if older adults in Mexico who have one or more adult children living in the United States are more or less likely to develop cognitive impairment over an 11-year period compared to older adults who do not have any adult children living in the United States...
October 24, 2016: Ethnicity & Health
Sungwoo Lim, Valerie Meausoone, Christina Norman, Carol Quinlan, Cynthia R Driver
OBJECTIVE: Neighborhood-level factors such as ethnic densities and social cohesion have been negatively associated with psychological distress among Latino Americans. Yet, existing evidence is based on either specific neighborhood factors or particular Latino subgroups. The objective of the study was to assess difference in psychological distress between each of four Latino subgroups (Puerto Ricans, Dominicans, Mexicans, other Latinos) and non-Latino white adults in New York City, and quantify total neighborhood-level influence on these differences...
October 24, 2016: Ethnicity & Health
H L Cole, S Pennycook, P C Hayes
BACKGROUND: Proton pump inhibitor (PPI) therapy has been reported to be an independent mortality risk factor in patients with cirrhosis. AIMS: To identify the prevalence of PPI prescription, the appropriateness of this therapy and to investigate the relationship between PPI therapy and overall survival in patients with liver disease. METHODS: This retrospective cohort study used patient data for 2012 to 2014 collected from the Scottish Liver Transplant Unit and the Hepatology Ward at the New Royal Infirmary of Edinburgh...
October 23, 2016: Alimentary Pharmacology & Therapeutics
Lihan Yan, Yongmin Sun, Michael R Boivin, Paul O Kwon, Yuanzhang Li
This paper reviews several common challenges encountered in statistical analyses of epidemiological data for epidemiologists. We focus on the application of linear regression, multivariate logistic regression, and log-linear modeling to epidemiological data. Specific topics include: (a) deletion of outliers, (b) heteroscedasticity in linear regression, (c) limitations of principal component analysis in dimension reduction, (d) hazard ratio vs. odds ratio in a rate comparison analysis, (e) log-linear models with multiple response data, and (f) ordinal logistic vs...
2016: Frontiers in Public Health
Ibrahim F Shatat, Suparna Qanungo, Shannon Hudson, Marilyn A Laken, Susan M Hailpern
BACKGROUND: Approximately 20% of children with sickle cell disease (SCD) have microalbuminuria (MA). Very little is known about the progression of MA in children and young adults with SCD. METHODS: In this study, we analyzed 5-year EMR data of 373 children [with ≥2 microalbumin-to-creatinine (MA/Cr) ratio measurements] followed at the Medical University of South Carolina to determine the rate, direction, magnitude, and predictors of MA/Cr change over time. RESULTS: Age range was 1-22 years; mean 10...
2016: Frontiers in Pediatrics
Arlener D Turner, Andrew S Lim, Sue E Leurgans, David A Bennett, Aron S Buchman, Lisa L Barnes
OBJECTIVE: Assess the relationship of self-reported sleep quality and possible sleep disorders with disability in a racially diverse sample of community-dwelling older adults. METHODS: Participants included 943 non-demented older African Americans (n=452) and Whites (n=491) from two cohort studies, the Minority Aging Research Study (MARS) and the Rush Memory and Aging Project (MAP). Participants completed a 32-item questionnaire assessing sleep quality and the possible presence of three sleep disorders (sleep apnea, restless leg syndrome [RLS] and REM behavior disorder [RBD])...
October 20, 2016: Ethnicity & Disease
Marc Aerts, Girma Minalu, Stefan Bösner, Frank Buntinx, Bernard Burnand, Jörg Haasenritter, Lilli Herzig, J André Knottnerus, Staffan Nilsson, Walter Renier, Carol Sox, Harold Sox, Norbert Donner-Banzhoff
OBJECTIVE: To construct a clinical prediction rule for coronary artery disease (CAD) presenting with chest pain in primary care. STUDY DESIGN: Meta-Analysis using 3099 patients from 5 studies. To identify candidate predictors, we used random forest trees, multiple imputation of missing values and logistic regression within individual studies. To generate a prediction rule on the pooled data, we applied a regression model that took account of the differing standard data sets collected by the 5 studies...
October 20, 2016: Journal of Clinical Epidemiology
Tania M Alarcon Falconi, Alexandra V Kulinkina, Venkata Raghava Mohan, Mark R Francis, Deepthi Kattula, Rajiv Sarkar, Honorine Ward, Gagandeep Kang, Vinohar Balraj, Elena N Naumova
Municipal water sources in India have been found to be highly contaminated, with further water quality deterioration occurring during household storage. Quantifying water quality deterioration requires knowledge about the exact source tap and length of water storage at the household, which is not usually known. This study presents a methodology to link source and household stored water, and explores the effects of spatial assumptions on the association between tap-to-household water quality deterioration and enteric infections in two semi-urban slums of Vellore, India...
October 3, 2016: International Journal of Hygiene and Environmental Health
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