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https://www.readbyqxmd.com/read/28812323/a-comparison-of-methods-for-estimating-the-temporal-change-in-a-continuous-variable-example-of-hba1c-in-patients-with-diabetes
#1
Therese Sheppard, Robyn Tamblyn, Michal Abrahamowicz, Mark Lunt, Matthew Sperrin, William G Dixon
PURPOSE: To compare the more complex technique, functional principal component analysis (FPCA), to simpler methods of estimating values of sparse and irregularly spaced continuous variables at given time points in longitudinal data using a diabetic patient cohort from UK primary care. METHODS: The setting for this study is the Clinical Practice Research Datalink (CPRD), a UK general practice research database. For 16,034 diabetic patients identified in CPRD, with at least 2 measures in a 30-month period, HbA1c was estimated after temporarily omitting (i) the final and (ii) middle known values using linear interpolation, simple linear regression, arithmetic mean, random effects, and FPCA...
August 15, 2017: Pharmacoepidemiology and Drug Safety
https://www.readbyqxmd.com/read/28811929/dual-energy-computed-tomography-angiography-virtual-calcified-plaque-subtraction-in-a-vascular-phantom
#2
Kwang Nam Jin, Jin Wook Chung, Eun-Ah Park, Whal Lee
BACKGROUND: Material decomposition of dual-energy computed tomography (DECT) enables subtraction of calcified plaque. PURPOSE: To evaluate the accuracy of lumen area measurement in calcified plaque by subtraction of DECT and to determine the effect of contrast material concentration, lumen diameter, density, and thickness of calcified plaque for the measurement. MATERIAL AND METHODS: Vessel phantoms were made with six lumen diameters (5.7, 4...
July 2017: Acta Radiologica Open
https://www.readbyqxmd.com/read/28810680/a-bayesian-approach-for-summarizing-and-modeling-time-series-exposure-data-with-left-censoring
#3
E Andres Houseman, M Abbas Virji
Objective: Direct reading instruments are valuable tools for measuring exposure as they provide real-time measurements for rapid decision making. However, their use is limited to general survey applications in part due to issues related to their performance. Moreover, statistical analysis of real-time data is complicated by autocorrelation among successive measurements, non-stationary time series, and the presence of left-censoring due to limit-of-detection (LOD). A Bayesian framework is proposed that accounts for non-stationary autocorrelation and LOD issues in exposure time-series data in order to model workplace factors that affect exposure and estimate summary statistics for tasks or other covariates of interest...
August 1, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/28810395/rasch-analysis-of-the-perceived-stress-scale-transformation-from-an-ordinal-to-a-linear-measure
#4
Oleg N Medvedev, Christian U Krägeloh, Erin M Hill, Rex Billington, Richard J Siegert, Craig S Webster, Roger J Booth, Marcus A Henning
Rasch analysis was conducted to enhance the precision of the widely used 10-item Perceived Stress Scale using two datasets ( n = 450 each) randomly selected from samples of the New Zealand general population ( n = 1102), New Zealand university students ( n = 479) and US university students ( n = 396). The best Rasch model fit ( χ(2)(27) = 29.92, p = .36), good person separation reliability (.80) and coverage (98%) of the sample by the scale items were achieved when locally dependent items were combined into subtests...
January 1, 2017: Journal of Health Psychology
https://www.readbyqxmd.com/read/28810177/use-of-atypical-antipsychotics-in-pregnancy-and-maternal-gestational-diabetes
#5
Alice Panchaud, Sonia Hernandez-Diaz, Marlene P Freeman, Adele C Viguera, Sarah C MacDonald, Alexandra Z Sosinsky, Lee S Cohen
BACKGROUND: Second generation antipsychotic medications (SGAs) are widely used by reproductive-age women to treat a number of psychiatric illnesses. Some SGAs have been associated with an increased risk of developing diabetes, although information regarding their diabetogenic effect in pregnant women is scarce. OBJECTIVE: To evaluate the risk of gestational diabetes (GDM) among women treated with SGA. METHOD: The Massachusetts General Hospital (MGH) National Pregnancy Registry for Atypical Antipsychotics (NPRAA) collects data on drug use, pregnancy outcomes, and other characteristics from pregnant women, ages 18-45 years, using 3 phone interviews conducted at (1) enrollment during pregnancy, (2) 7 months' gestation, and (3) 2-3 months postpartum...
July 29, 2017: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/28810129/opioid-prescribing-for-chronic-pain-in-a-community-based-healthcare-system
#6
Robert J Romanelli, Laurence I Ikeda, Braden Lynch, Terri Craig, Joseph C Cappelleri, Trevor Jukes, Denis Y Ishisaka
OBJECTIVES: We sought to evaluate opioid prescribing in an ambulatory setting among patients with noncancer chronic pain (CP). STUDY DESIGN: Cross-sectional analysis. METHODS: We identified patients with at least 2 CP encounters at least 30 days apart in 2012 in the electronic health records of a community-based healthcare delivery system in northern California. We used logistic regression models to assess associations of receiving an opioid prescription with respect to number and type of CP conditions and patient demographics and characteristics...
May 1, 2017: American Journal of Managed Care
https://www.readbyqxmd.com/read/28810127/medicaid-prior-authorization-and-opioid-medication-abuse-and-overdose
#7
Gerald Cochran, Adam J Gordon, Walid F Gellad, Chung-Chou H Chang, Wei-Hsuan Lo-Ciganic, Carroline Lobo, Evan Cole, Winfred Frazier, Ping Zheng, David Kelley, Julie M Donohue
OBJECTIVES: The US opioid medication epidemic has resulted in serious health consequences for patients. Formulary management tools adopted by payers, specifically prior authorization (PA) policies, may lower the rates of opioid medication abuse and overdose. We compared rates of opioid abuse and overdose among enrollees in plans that varied in their use of PA from "High PA" (ie, required PA for 17 to 74 opioids), with "Low PA" (ie, required PA for 1 opioid), and "No PA" policies for opioid medications...
May 1, 2017: American Journal of Managed Care
https://www.readbyqxmd.com/read/28809923/generalized-structural-equations-improve-sexual-selection-analyses
#8
Sonia Lombardi, Giacomo Santini, Giovanni Maria Marchetti, Stefano Focardi
Sexual selection is an intense evolutionary force, which operates through competition for the access to breeding resources. There are many cases where male copulatory success is highly asymmetric, and few males are able to sire most females. Two main hypotheses were proposed to explain this asymmetry: "female choice" and "male dominance". The literature reports contrasting results. This variability may reflect actual differences among studied populations, but it may also be generated by methodological differences and statistical shortcomings in data analysis...
2017: PloS One
https://www.readbyqxmd.com/read/28808952/effect-of-reducing-cost-sharing-for-outpatient-care-on-children-s-inpatient-services-in-japan
#9
Hirotaka Kato, Rei Goto
BACKGROUND: Assessing the impact of cost sharing on healthcare utilization is a critical issue in health economics and health policy. It may affect the utilization of different services, but is yet to be well understood. OBJECTIVE: This paper investigates the effects of reducing cost sharing for outpatient services on hospital admissions by exploring a subsidy policy for children's outpatient services in Japan. METHODS: Data were extracted from the Japanese Diagnosis Procedure Combination database for 2012 and 2013...
August 15, 2017: Health Economics Review
https://www.readbyqxmd.com/read/28808829/norwegian-reference-values-for-the-short-form-health-survey-36-development-over-time
#10
Ellisiv L Jacobsen, Asta Bye, Nina Aass, Sophie D Fosså, Kjersti S Grotmol, Stein Kaasa, Jon Håvard Loge, Torbjørn Moum, Marianne J Hjermstad
PURPOSE: Reference values for patient-reported outcome measures are useful for interpretation of results from clinical trials. The study aims were to collect Norwegian SF-36 reference values and compare with data from 1996 to 2002. METHODS: In 2015, SF-36 was sent by mail to a representative sample of the population (N = 6165). Time trends and associations between background variables and SF-36 scale scores were compared by linear regression models. RESULTS: The 2015 response rate was 36% (N = 2118) versus 67% (N = 2323) in 1996 and 56% (N = 5241) in 2002...
August 14, 2017: Quality of Life Research
https://www.readbyqxmd.com/read/28808797/do-carer-s-levels-of-unmet-needs-change-over-time-when-caring-for-patients-diagnosed-with-high-grade-glioma-and-how-are-these-needs-correlated-with-distress
#11
G K B Halkett, E A Lobb, T Shaw, M M Sinclair, L Miller, E Hovey, A K Nowak
PURPOSE: The aim of the current study was to determine how carer needs changed longitudinally and understand associations between unmet needs and distress. METHODS: Family carers of patients with high-grade glioma (HGG) were recruited. Carers completed questionnaires during patients' chemoradiotherapy (T1), 3 months (T2) and 6 months (T3) including the following: the Distress Thermometer, the General Health Questionnaire-12, the Partner and Carer Supportive Care (PCS) Needs Scale and its supplement the Access to Services Needs Scale and the Brain Tumour Specific Supportive Care Needs Scale...
August 14, 2017: Supportive Care in Cancer: Official Journal of the Multinational Association of Supportive Care in Cancer
https://www.readbyqxmd.com/read/28808435/double-cone-of-eigendirections-in-optically-active-ethylenediammonium-selenate-crystals
#12
Alexander T Martin, Shane M Nichols, Sichao Li, Melissa Tan, Bart Kahr
Circular birefringence (CB) is generally responsible for only a small perturbation to the state of light polarization in crystals that also exhibit linear birefringence (LB). As such, the magnetoelectric tensor of gyration, which gives rise to CB and optical activity, is less well determined than the electric permittivity tensor in optical models of the Mueller matrix. To visualize the effect of the magnetoelectric tensor on polarimetric measurements, reported here are experimental mappings of the Mueller matrix and of the CB in a new chiral crystal with accidental null LB at an accessible optical frequency...
August 1, 2017: Journal of Applied Crystallography
https://www.readbyqxmd.com/read/28807870/an-open-multi-vendor-multi-field-strength-brain-mr-dataset-and-analysis-of-publicly-available-skull-stripping-methods-agreement
#13
REVIEW
Roberto Souza, Oeslle Lucena, Julia Garrafa, David Gobbi, Marina Saluzzi, Simone Appenzeller, Letícia Rittner, Richard Frayne, Roberto Lotufo
This paper presents an open, multi-vendor, multi-field strength magnetic resonance (MR) T1-weighted volumetric brain imaging dataset, named Calgary-Campinas-359 (CC-359). The dataset is composed of images of older healthy adults (29-80 years) acquired on scanners from three vendors (Siemens, Philips and General Electric) at both 1.5 T and 3 T. CC-359 is comprised of 359 datasets, approximately 60 subjects per vendor and magnetic field strength. The dataset is approximately age and gender balanced, subject to the constraints of the available images...
August 11, 2017: NeuroImage
https://www.readbyqxmd.com/read/28807285/sarcoptes-scabiei-alters-follicular-dynamics-in-female-iberian-ibex-through-a-reduction-in-body-weight
#14
José Espinosa, José E Granados, Francisco J Cano-Manuel, Jorge R López-Olvera, Arián Ráez-Bravo, Diego Romero, Ramón C Soriguer, Jesús M Pérez, Paulino Fandos
Normal development of the ovarian cycle is a key factor in ensuring female reproductive success. Sarcoptes scabiei has been shown to induce changes in host physiology, although the effects of this mite on the female reproductive cycle are still unknown. In an attempt to clarify this issue, the number of ovarian structures (primary follicles, secondary follicles, Graaf follicles, corpus luteum and corpus albicans) in female Iberian ibex (Capra pyrenaica) affected by sarcoptic mange was explored by histological analysis of samples taken from 102 females selectively harvested in the Sierra Nevada Natural Space, southern Spain...
August 30, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28806930/factors-associated-with-change-in-objectively-measured-physical-activity-in-older-people-data-from-the-physical-activity-cohort-scotland-study
#15
Clare L Clarke, Falko F Sniehotta, Thenmalar Vadiveloo, Ishbel S Argo, Peter T Donnan, Marion E T McMurdo, Miles D Witham
BACKGROUND: Cross-sectional relationships between physical activity and health have been explored extensively, but less is known about how physical activity changes with time in older people. The aim of this study was to assess baseline predictors of how objectively measured physical activity changes with time in older people. METHODS: Longitudinal cohort study using data from the Physical Activity Cohort Scotland. A sample of community-dwelling older people aged 65 and over were recruited in 2009-2011, then followed up 2-3 years later...
August 14, 2017: BMC Geriatrics
https://www.readbyqxmd.com/read/28806692/microplastic-pollution-identified-in-deep-sea-water-and-ingested-by-benthic-invertebrates-in-the-rockall-trough-north-atlantic-ocean
#16
Winnie Courtene-Jones, Brian Quinn, Stefan F Gary, Andrew O M Mogg, Bhavani E Narayanaswamy
Microplastics are widespread in the natural environment and present numerous ecological threats. While the ultimate fate of marine microplastics are not well known, it is hypothesized that the deep sea is the final sink for this anthropogenic contaminant. This study provides a quantification and characterisation of microplastic pollution ingested by benthic macroinvertebrates with different feeding modes (Ophiomusium lymani, Hymenaster pellucidus and Colus jeffreysianus) and in adjacent deep water > 2200 m, in the Rockall Trough, Northeast Atlantic Ocean...
August 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28806681/human-biomonitoring-of-polycyclic-aromatic-hydrocarbonsand-metals-in-the-general-population-residing-near-the-municipal-solid-waste-incinerator-of-modena-italy
#17
Maria Giulia Gatti, Petra Bechtold, Laura Campo, Giovanna Barbieri, Giulia Quattrini, Andrea Ranzi, Sabrina Sucato, Luca Olgiati, Elisa Polledri, Michael Romolo, Laura Iacuzio, Giuliano Carrozzi, Paolo Lauriola, Carlo A Goldoni, Silvia Fustinoni
BACKGROUND AND OBJECTIVES: A cross-sectional biomonitoring study was carried out to investigate exposure to incinerator emission in relation to the body burden of selected biomarkers in the population living around the plant. METHODS: Approximately 500 people, aged 18-69 yrs, living within 4 km from the incinerator were randomly selected form the population register. Exposure was measured through fall-out maps of particulate matter (PM), used as tracer for incinerator emissions...
August 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28805904/higher-dominance-position-does-not-result-in-higher-reproductive-success-in-female-beef-cattle
#18
R Šárová, M Špinka, F Ceacero
The aim of this study was to investigate whether beef cows that achieve higher dominance status than their age-mates have prolonged reproductive life, increased number of offspring born and weaned, and/or heavier BW of the offspring. We also assessed whether maternal dominance rank affects the offspring sex ratio. We recorded data on 309 potential deliveries of female beef cows with known dominance status in a seasonally pastured herd over a 14-yr period and linked them with yearly records of dominance status of the cows assessed around feeding...
August 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28805017/estimating-the-between-farm-transmission-rates-for-highly-pathogenic-avian-influenza-subtype-h5n1-epidemics-in-bangladesh-between-2007-and-2013
#19
A Ssematimba, I Okike, G M Ahmed, M Yamage, G J Boender, T J Hagenaars, B Bett
Highly Pathogenic Avian Influenza (HPAI) is classified by the World Organization for Animal Health as one of the notifiable diseases. Its occurrence is associated with severe socio-economic impacts and is also zoonotic. Bangladesh HPAI epidemic data for the period between 2007 and 2013 were obtained and split into epidemic waves based on the time lag between outbreaks. By assuming the number of newly infected farms to be binomially distributed, we fit a Generalized Linear Model to the data to estimate between-farm transmission rates (β)...
August 14, 2017: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/28804262/effects-of-boundary-conditions-on-bistable-behaviour-in-axisymmetrical-shallow-shells
#20
P M Sobota, K A Seffen
Multistable shells are thin-walled structures that have more than one stable state of self-stress. We consider isotropic axisymmetrical shallow shells of arbitrary polynomial shapes using a Föppl-von Kármán analytical model. By employing a Rayleigh-Ritz approach, we identify stable shapes from local minima in the strain energy formulation, and we formally characterize the level of influence of the boundary conditions on the critical geometry for achieving bistable inversion-an effect not directly answered in the literature...
July 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
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