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Biostatistic

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https://www.readbyqxmd.com/read/28441139/empirical-likelihood-in-nonignorable-covariate-missing-data-problems
#1
Yanmei Xie, Biao Zhang
Missing covariate data occurs often in regression analysis, which frequently arises in the health and social sciences as well as in survey sampling. We study methods for the analysis of a nonignorable covariate-missing data problem in an assumed conditional mean function when some covariates are completely observed but other covariates are missing for some subjects. We adopt the semiparametric perspective of Bartlett et al. (Improving upon the efficiency of complete case analysis when covariates are MNAR. Biostatistics 2014;15:719-30) on regression analyses with nonignorable missing covariates, in which they have introduced the use of two working models, the working probability model of missingness and the working conditional score model...
April 20, 2017: International Journal of Biostatistics
https://www.readbyqxmd.com/read/28422593/fundamentals-in-biostatistics-for-investigation-in-pediatric-dentistry-part-ii-biostatistical-methods
#2
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/28414848/-abstract-bodies-concrete-risks-clinical-devices-and-the-health-of-ova-donors-in-argentine-reproductive-medicine
#3
Lucía Ariza
Using a methodological perspective grounded in science and technology studies, this article analyzes two sociotechnical devices used in Argentine reproductive medicine (biostatistical measures and donation registries) with the aim of controlling both the so-called "genetic risk" arising from the use of donated ova as well as the health risks to female donors. By examining how the deployment of monitoring criteria disregards the specificity of ova donation, the article suggests that it is not the absence of control measures and clinical criteria that produces an inadequate monitoring of such risks, but rather the concrete ways in which such measures are implemented that results in potential harms to the health of female donors...
July 2016: Salud Colectiva
https://www.readbyqxmd.com/read/28400629/biostatistics-series-module-8-assessing-risk
#4
Avijit Hazra, Nithya Gogtay
In observational studies, as well as in interventional ones, it is frequently necessary to estimate risk that is the association between an observed outcome or event and exposure to one or more factors that may be contributing to the event. Understanding incidence and prevalence are the starting point in any discussion of risk assessment. Incidence rate uses person-time as the denominator rather than a simple count. Ideally, rates and ratios estimated from samples should be presented with their corresponding 95% confidence intervals (CIs)...
March 2017: Indian Journal of Dermatology
https://www.readbyqxmd.com/read/28381719/practice-of-regulatory-science-drug-development
#5
Toru Kawanishi
 The practice of regulatory science (RS) for drug development is described. In the course material for education in pharmaceutical sciences drafted by the RS Division of the Pharmaceutical Society of Japan, RS for pharmaceuticals is defined as the science of predicting, assessing, and judging the quality, efficacy, and safety of pharmaceutical products throughout their lifespan. RS is also described as an integrated science based on basic and applied biomedical sciences, including analytical chemistry, biochemistry, pharmacology, toxicology, genetics, biostatistics, epidemiology, and clinical trial methodology, and social sciences such as decision science, risk assessment, and communication science...
2017: Yakugaku Zasshi: Journal of the Pharmaceutical Society of Japan
https://www.readbyqxmd.com/read/28379479/experimental-design-and-data-analysis-of-ago-rip-seq-experiments-for-the-identification-of-microrna-targets
#6
Diana Tichy, Julia Maria Anna Pickl, Axel Benner, Holger Sültmann
The identification of microRNA (miRNA) target genes is crucial for understanding miRNA function. Many methods for the genome-wide miRNA target identification have been developed in recent years; however, they have several limitations including the dependence on low-confident prediction programs and artificial miRNA manipulations. Ago-RNA immunoprecipitation combined with high-throughput sequencing (Ago-RIP-Seq) is a promising alternative. However, appropriate statistical data analysis algorithms taking into account the experimental design and the inherent noise of such experiments are largely lacking...
March 31, 2017: Briefings in Bioinformatics
https://www.readbyqxmd.com/read/28345445/the-role-of-patient-financial-assistance-programs-in-reducing-costs-for-cancer-patients
#7
Leah L Zullig, Steven Wolf, Lisa Vlastelica, Veena Shankaran, S Yousuf Zafar
BACKGROUND: Limited transparency exists regarding eligibility and benefits for patient financial assistance programs (PAPs). OBJECTIVE: To describe oral anticancer medication costs, insurance coverage, and the degree of financial assistance provided by PAPs. METHODS: This was a retrospective study of prescription anticancer medication costs and PAP coverage. The study used data from an academic cancer center's specialty pharmacy. Medication, cost, and coverage data were collected from the specialty pharmacy database for prescriptions filled from January 2013 to November 2015...
April 2017: Journal of Managed Care & Specialty Pharmacy
https://www.readbyqxmd.com/read/28338970/woody-plant-ecosystems-under-climate-change-and-air-pollution-response-consistencies-across-zonobiomes
#8
R Matyssek, A R Kozovits, G Wieser, J King, H Rennenberg
Forests store the largest terrestrial pools of carbon (C), helping to stabilize the global climate system, yet are threatened by climate change (CC) and associated air pollution (AP, highlighting ozone (O3) and nitrogen oxides (NOx)). We adopt the perspective that CC-AP drivers and physiological impacts are universal, resulting in consistent stress responses of forest ecosystems across zonobiomes. Evidence supporting this viewpoint is presented from the literature on ecosystem gross/net primary productivity and water cycling...
March 14, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28338852/the-growth-of-biostatistics-and-estimation-of-cancer-risk-estimates-past-current-and-future-challenges
#9
Dale L Preston, Daniel O Stram
There has been a long process of growth and development of statistical approaches to the analysis of cancer incidence and mortality data obtained from the follow-up of radiation exposed populations. The challenges of radiation risk analysis provided impetus for innovative statistical methods, including, the inception and continued improvement of hazard rate regression methods. Key statistical contributions that improved cancer risk estimation include statistical advances pertaining to the measurement error problem...
April 1, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28329653/introducing-public-health-themes-in-clinical-dermatology
#10
Scott A Norton
The ACGME's Core Competencies comprise six domains, which in turn contain dozens of often overlapping milestones. Several competencies explicitly invoke public health topics - but if one wears the right set of lenses, nearly every milestone, nearly every aspect of health and medicine, can be viewed from a public health perspective. Why then is Dermatology generally taught - and practiced - in an Intensive Care manner, where seemingly unlimited diagnostic & therapeutic efforts focus on single individuals, not the community?In this presentation, I argue that topics of public health concern should not be relegated to the minor leagues of GME...
September 15, 2016: Dermatology Online Journal
https://www.readbyqxmd.com/read/28321138/student-preparation-for-pgy1-residency-training-by-us-colleges-of-pharmacy-survey-of-the-residency-program-director-perspective
#11
Alyssa B Mutz, Jacob Beyer, Whitney L Dickson, Irina Gutman, Filiz Yucebay, Marcie Lepkowsky, Juliana Chan, Kristen Carter, Christopher L Shaffer, Patrick D Fuller
Purpose: To evaluate current residents' level of preparation by US colleges of pharmacy for postgraduate year 1 (PGY1) residency training from the perspective of residency program directors (RPDs). Methods: RPDs were asked in an electronic survey questionnaire to rate PGY1 pharmacy residents' abilities in 4 domains: communication, clinical knowledge, interpersonal/time-management skills, and professionalism/leadership. Results: One hundred ninety-seven RPDs of the American Society of Health-System Pharmacists (ASHP)-accredited PGY1 programs completed the survey...
February 2017: Hospital Pharmacy
https://www.readbyqxmd.com/read/28319460/power-and-sample-size-for-the-s-t-repeated-measures-design-combined-with-a-linear-mixed-effects-model-allowing-for-missing-data
#12
Toshiro Tango
Tango (Biostatistics 2016) proposed a new repeated measures design called the S:T repeated measures design, combined with generalized linear mixed-effects models and sample size calculations for a test of the average treatment effect that depend not only on the number of subjects but on the number of repeated measures before and after randomization per subject used for analysis. The main advantages of the proposed design combined with the generalized linear mixed-effects models are (1) it can easily handle missing data by applying the likelihood-based ignorable analyses under the missing at random assumption and (2) it may lead to a reduction in sample size compared with the simple pre-post design...
February 13, 2017: Journal of Biopharmaceutical Statistics
https://www.readbyqxmd.com/read/28315391/quality-assessment-of-vitamin-d-metabolite-assays-used-by-clinical-and-research-laboratories
#13
G D Carter, J Berry, R Durazo-Arvizu, E Gunter, G Jones, J Jones, H L J Makin, P Pattni, K W Phinney, C T Sempos, E L Williams
The Vitamin D External Quality Assessment Scheme (DEQAS) was launched in 1989 and monitors the performance of 25-hydroxyvitamin D (25-OHD) and 1,25- dihydroxyvitamin D (1,25(OH)2D) assays. In April 2015 a pilot scheme for 24,25-dihydroxyvitamin D (24,25(OH)2D) was introduced. The 25-OHD scheme is accuracy - based with target values assigned by the NIST Reference Measurement Procedure (RMP) for 25-OHD2 and 25-OHD3. A similar method is used to assign values for 3-epi-25-OHD. Five samples of human serum are distributed quarterly to over 1000 participants in 58 countries (April 2016) and clinical laboratories are expected to submit results within approximately 5 weeks...
March 14, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28288291/fundamentals-in-biostatistics-for-research-in-pediatric-dentistry-part-i-basic-concepts
#14
J A Garrocho-Rangel, M S Ruiz-Rodríguez, A J Pozos-Guillén
The purpose of this report was to provide the reader with some basic concepts in order to better understand the significance and reliability of the results of any article on Pediatric Dentistry. Currently, Pediatric Dentists need the best evidence available in the literature on which to base their diagnoses and treatment decisions for the children's oral care. Basic understanding of Biostatistics plays an important role during the entire Evidence-Based Dentistry (EBD) process. This report describes Biostatistics fundamentals in order to introduce the basic concepts used in statistics, such as summary measures, estimation, hypothesis testing, effect size, level of significance, p value, confidence intervals, etc...
2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28285484/basic-biostatistics-and-clinical-medicine
#15
Joshua Banting, Tony Meriano
No abstract text is available yet for this article.
2017: Journal of Special Operations Medicine: a Peer Reviewed Journal for SOF Medical Professionals
https://www.readbyqxmd.com/read/28281147/molecular-tumor-boards-ethical-issues-in-the-new-era-of-data-medicine
#16
Henri-Corto Stoeklé, Marie-France Mamzer-Bruneel, Charles-Henry Frouart, Christophe Le Tourneau, Pierre Laurent-Puig, Guillaume Vogt, Christian Hervé
The practice and development of modern medicine requires large amounts of data, particularly in the domain of cancer. The future of personalized medicine lies neither with "genomic medicine" nor with "precision medicine", but with "data medicine" (DM) (big data, data mining). The establishment of this DM has required far-reaching changes, to establish four essential elements connecting patients and doctors: biobanks, databases, bioinformatic platforms and genomic platforms. The "transformation" of scientific research areas, such as genetics, bioinformatics and biostatistics, into clinical specialties has generated a new vision of care...
March 9, 2017: Science and Engineering Ethics
https://www.readbyqxmd.com/read/28262773/metabolomics-for-clinical-use-and-research-in-chronic-kidney-disease
#17
REVIEW
Berthold Hocher, Jerzy Adamski
Chronic kidney disease (CKD) has a high prevalence in the general population and is associated with high mortality; a need therefore exists for better biomarkers for diagnosis, monitoring of disease progression and therapy stratification. Moreover, very sensitive biomarkers are needed in drug development and clinical research to increase understanding of the efficacy and safety of potential and existing therapies. Metabolomics analyses can identify and quantify all metabolites present in a given sample, covering hundreds to thousands of metabolites...
May 2017: Nature Reviews. Nephrology
https://www.readbyqxmd.com/read/28253530/statistics-for-radiology-research
#18
Nancy A Obuchowski, Naveen Subhas, Joshua Polster
Biostatistics is an essential component in most original research studies in imaging. In this article we discuss five key statistical concepts for study design and analyses in modern imaging research: statistical hypothesis testing, particularly focusing on noninferiority studies; imaging outcomes especially when there is no reference standard; dealing with the multiplicity problem without spending all your study power; relevance of confidence intervals in reporting and interpreting study results; and finally tools for assessing quantitative imaging biomarkers...
February 2017: Seminars in Musculoskeletal Radiology
https://www.readbyqxmd.com/read/28242302/the-feature-selection-approach-for-evaluation-of-potential-rheumatoid-arthritis-markers-using-maldi-tof-datasets
#19
Bartosz Urbaniak, Piotr Nowicki, Dorota Sikorska, Włodzimierz Samborski, Zenon J Kokot
BACKGROUND: The selection of the most representative mass profiles, in rheumatoid arthritis (RA) serum samples was developed. This allows for selection and identification of potential biomarkers in RA serum samples. METHODS: The RA and controls samples were analyzed using MALDI-TOF. Two different protein elution procedures utilizing ZipTips (E1 and E2) were examined. The statistical evaluation of data was performed using different feature selection (FS) methods in combination with different classifiers, while identification of selected masses was performed using MALDI-TOF-TOF...
February 24, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/28216720/biostatistics-series-module-7-the-statistics-of-diagnostic-tests
#20
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
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