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Statistical methods

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https://www.readbyqxmd.com/read/27915433/does-the-tnm-classification-of-solitary-internal-mammary-lymph-node-metastases-in-breast-cancer-still-apply
#1
V Habraken, T J A van Nijnatten, L de Munck, M Moossdorff, E M Heuts, M B I Lobbes, M L Smidt
PURPOSE: TNM classification of solitary internal mammary lymph node metastases (IMLNMs) in breast cancer varies depending on their method of detection: sentinel lymph node biopsy (pN1b) or clinical examination including radiological and/or physical examination (pN2b). This study aimed to evaluate whether there is a difference in prognosis between both groups. METHODS: Data of all patients diagnosed with primary invasive epithelial breast cancer between 2005 and 2008 were obtained from the Netherlands Cancer Registry...
December 3, 2016: Breast Cancer Research and Treatment
https://www.readbyqxmd.com/read/27915417/retrospective-analysis-of-10-000-implants-from-insertion-up-to-20%C3%A2-years-analysis-of-implantations-using-augmentative-procedures
#2
Wolfram Knöfler, Thomas Barth, Reinhard Graul, Dietmar Krampe
BACKGROUND: A sufficient amount of bone is essential to ensure long-term stability of dental implants. To support the bone regeneration process, different techniques and materials are available. It has been questioned whether these techniques and materials may compromise implant survival compared to pristine bone. To properly answer this question, long-term stability up to 20.2 years after insertion of implants placed in augmented or non-augmented sites was retrospectively analysed. METHODS: Retrospective analysis included 10,158 implants from 3095 patients in three private practices who underwent implant therapy with or without bone augmentation procedures...
December 2016: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/27915284/dna-extraction-protocols-may-influence-biodiversity-detected-in-the-intestinal-microbiome-a-case-study-from-wild-prussian-carp-carassius-gibelio
#3
Elena N Kashinskaya, Karl B Andree, Evgeniy P Simonov, Mikhail M Solovyev
In this investigation, we examined the influence of different DNA extraction protocols on results obtained for intestinal microbiota of Prussian carp. We showed that significant differences were observed in numbers of reads, OTU's, Shannon index and taxonomic composition between two different DNA extraction protocols for intestine of Prussian carp (Carassius gibelio), and differences were also evident between microbial communities in the intestinal mucosa and intestinal content. Statistical analyses of 25 published articles also revealed a significant relationship between methods of DNA extraction and bacterial diversity in fish intestine of freshwater species...
December 2, 2016: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/27915188/combined-cluster-and-discriminant-analysis-an-efficient-chemometric-approach-in-diesel-fuel-characterization
#4
Márton Novák, Dóra Palya, Zsolt Bodai, Zoltán Nyiri, Norbert Magyar, József Kovács, Zsuzsanna Eke
Combined cluster and discriminant analysis (CCDA) as a chemometric tool in compound specific isotope analysis of diesel fuels was studied. The stable carbon isotope ratios (δ(13)C) of n-alkanes in diesel fuel can be used to characterize or differentiate diesels originating from different sources. We investigated 25 diesel fuel samples representing 20 different brands. The samples were collected from 25 different service stations in 11 European countries over a 2 year period. The n-alkane fraction of diesel fuels was separated using solid-state urea clathrate formation combined with silica gel fractionation...
November 23, 2016: Forensic Science International
https://www.readbyqxmd.com/read/27915121/predicting-individual-brain-functional-connectivity-using-a-bayesian-hierarchical-model
#5
Tian Dai, Ying Guo
Network-oriented analysis of functional magnetic resonance imaging (fMRI), especially resting-state fMRI, has revealed important association between abnormal connectivity and brain disorders such as schizophrenia, major depression and Alzheimer's disease. Imaging-based brain connectivity measures have become a useful tool for investigating the pathophysiology, progression and treatment response of psychiatric disorders and neurodegenerative diseases. Recent studies have started to explore the possibility of using functional neuroimaging to help predict disease progression and guide treatment selection for individual patients...
November 30, 2016: NeuroImage
https://www.readbyqxmd.com/read/27915112/a-wavelet-filtering-method-for-cumulative-gamma-spectroscopy-used-in-wear-measurements
#6
Davide Bianchi, Claudia Lenauer, Gerhard Betz, András Vernes
Continuous ultra-mild wear quantification using radioactive isotopes involves measuring very low amounts of activity in limited time intervals. This results in gamma spectra with poor signal-to-noise ratio and hence very scattered wear data, especially during running-in, where wear is intrinsically low. Therefore, advanced filtering methods reducing the wear data scattering and making the calculation of the main peak area more accurate are mandatory. An energy-time dependent threshold for wavelet detail coefficients based on Poisson statistics and using a combined Barwell law for the estimation of the average photon counting rate is then introduced...
November 26, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/27914765/operative-morbidity-and-survival-following-hepatectomy-for-colorectal-liver-metastasis-in-octogenarians-a-contemporary-case-matched-series
#7
Julie N Leal, Eran Sadot, Mithat Gonen, Stuart Lichtman, T Peter Kingham, Peter J Allen, Ronald P DeMatteo, William R Jarnagin, Michael I D'Angelica
BACKGROUND: Clinical outcomes of octogenarians undergoing hepatectomy for colorectal liver metastases (CRLM) are poorly characterized. The current study evaluated operative morbidity, mortality and survival outcomes among a contemporary cohort of octogenarians. METHODS: Patients undergoing their first hepatectomy for CRLM were identified from institutional databases and those ≥80 years old (y) were matched 1:1 to a group of patients <80 y. Data pertaining to surgical morbidity/mortality and survival were compared using standard statistical methods...
November 30, 2016: HPB: the Official Journal of the International Hepato Pancreato Biliary Association
https://www.readbyqxmd.com/read/27914715/prostate-cancer-in-young-adults-seventeen-year-clinical-experience-of-a-single-center
#8
Tzu-Hao Huang, Junne-Yih Kuo, Yi-Hsiu Huang, Hsiao-Jen Chung, William J S Huang, Howard H H Wu, Yen-Hwa Chang, Alex T L Lin, Kuang-Kuo Chen
BACKGROUND: In the general population, prostate adenocarcinoma affects predominately older men. If fact, most current guidelines suggest that males over the age of 50 years should undergo prostate cancer screening. However, the clinical behavior and prognosis of prostate cancer in young adults is not well defined. The aim of this study was to evaluate the clinical behavior, pathological characteristics, and prognosis of prostate cancer in young adults. METHODS: We retrospectively reviewed the records of young patients (age, ≤50 years) in our hospital with prostate adenocarcinoma between 1997 and 2013...
November 30, 2016: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/27914711/proteomic-based-research-strategy-identified-laminin-subunit-alpha-2-as-a-potential-urinary-specific-biomarker-for-the-medullary-sponge-kidney-disease
#9
Antonia Fabris, Maurizio Bruschi, Laura Santucci, Giovanni Candiano, Simona Granata, Alessandra Dalla Gassa, Nadia Antonucci, Andrea Petretto, Gian Marco Ghiggeri, Giovanni Gambaro, Antonio Lupo, Gianluigi Zaza
Medullary sponge kidney (MSK) disease, a rare kidney malformation featuring recurrent renal stones and nephrocalcinosis, continues to be diagnosed using expensive and time-consuming clinical/instrumental tests (mainly urography). Currently, no molecular diagnostic biomarkers are available. To identify such we employed a proteomic-based research strategy utilizing urine from 22 patients with MSK and 22 patients affected by idiopathic calcium nephrolithiasis (ICN) as controls. Notably, two patients with ICN presented cysts...
November 30, 2016: Kidney International
https://www.readbyqxmd.com/read/27914666/reprint-of-spatial-modeling-of-cutaneous-leishmaniasis-in-iran-from-1983-to-2013
#10
Kourosh Holakouie-Naieni, Ehsan Mostafavi, Ali Darvishi Boloorani, Mehdi Mohebali, Reza Pakzad
INTRODUCTION: Cutaneous Leshmaniasis (CL), a parasitic skin infection caused by Leishmania species, is endemic in some regions of Iran. In this study, the effect of location on the incidence and distribution of CL in Iran was studied. METHODS: We collected datas including the number of Cutaneous Leishmaniasis cases and populations at-risk of disease in Iran's different provinces reported by the Iranian ministry of health and the National Bureau of Statistics, respectively...
November 30, 2016: Acta Tropica
https://www.readbyqxmd.com/read/27914660/radiographic-and-clinical-results-of-tension-suture-fixation-using-two-washers-with-philos-plate-for-proximal-humeral-fractures
#11
Chul-Hyun Cho, Du Han Kim, Beom-Soo Kim
INTRODUCTION: The purpose of this study was to evaluate the radiographic and clinical results of tension suture fixation using two washers with PHILOS plate (Synthes, West Chester, PA, USA) for proximal humeral fractures. PATIENTS AND METHODS: Consecutive 39 patients were included and divided into two groups of adequate and inadequate medial support (MS (+) group vs MS (-) group). The mean follow-up period was 45months (range: 26-69 months). The mean age at the time of surgery was 59 years (range: 17-86 years) and there were 12 men and 27 women...
November 28, 2016: Injury
https://www.readbyqxmd.com/read/27914277/accurate-assessment-of-the-weight-of-evidence-for-dna-mixtures-by-integrating-the-likelihood-ratio
#12
Klaas Slooten
Several methods exist for weight of evidence calculations on DNA mixtures. Especially if dropout is a possibility, it may be difficult to estimate mixture specific parameters needed for the evaluation. For semi-continuous models, the LR for a person to have contributed to a mixture depends on the specified number of contributors and the probability of dropout for each. We show here that, for the semi-continuous model that we consider, the weight of evidence can be accurately obtained by applying the standard statistical technique of integrating the likelihood ratio against the parameter likelihoods obtained from the mixture data...
November 16, 2016: Forensic Science International. Genetics
https://www.readbyqxmd.com/read/27914275/inter-observer-agreement-of-the-general-movements-assessment-with-infants-following-surgery
#13
Cathryn Crowle, Claire Galea, Catherine Morgan, Iona Novak, Karen Walker, Nadia Badawi
BACKGROUND: The General Movements Assessment (GMA) is a validated and reliable method of identifying infants at risk of adverse neurodevelopmental outcomes, however there is minimal data available on the use of the GMA with infants following surgery. AIMS: The aim of this study was to investigate the inter-observer agreement for the GMA with this infant population. STUDY DESIGN: Reliability and agreement study. SUBJECTS: This was a prospective cohort study of 190 infants (male n=112) born at term (mean 38weeks, SD 2weeks)...
November 30, 2016: Early Human Development
https://www.readbyqxmd.com/read/27914265/automated-quantification-of-three-dimensional-organization-of-fiber-like-structures-in-biological-tissues
#14
Zhiyi Liu, Dimitra Pouli, Disha Sood, Aswin Sundarakrishnan, Carrie K Hui Mingalone, Lisa M Arendt, Carlo Alonzo, Kyle P Quinn, Charlotte Kuperwasser, Li Zeng, Thomas Schnelldorfer, David L Kaplan, Irene Georgakoudi
Fiber-like structures are prevalent in biological tissues, yet quantitative approaches to assess their three-dimensional (3D) organization are lacking. We develop 3D directional variance, as a quantitative biomarker of truly 3D fibrillar organization by extending the directional statistics formalism developed for describing circular data distributions (i.e. when 0° and 360° are equivalent) to axial ones (i.e. when 0° and 180° are equivalent). Significant advantages of this analysis include its time efficiency, sensitivity and ability to provide quantitative readouts of organization over different size scales of a given data set...
November 25, 2016: Biomaterials
https://www.readbyqxmd.com/read/27914102/examining-temporal-effects-on-cancer-risk-in-the-international-nuclear-workers-study-inworks
#15
Robert D Daniels, Stephen J Bertke, David B Richardson, Elisabeth Cardis, Michael Gillies, Jacqueline A O'Hagan, Richard Haylock, Dominique Laurier, Klervi Leuraud, Monika Moissonnier, Isabelle Thierry-Chef, Ausrele Kesminiene, Mary K Schubauer-Berigan
The paper continues the series of publications from the International Nuclear Workers Study cohort (INWORKS) that comprises 308,297 workers from France, the United Kingdom and the United States, providing 8.2 million person-years of observation from a combined follow-up period (at earliest 1944 to at latest 2005). These workers' external radiation exposures were primarily to photons, resulting in an estimated average career absorbed dose to the colon of 17.4 milligray. The association between cumulative ionizing radiation dose and cancer mortality was evaluated in general relative risk models that describe modification of the excess relative risk (ERR) per gray (Gy) by time since exposure and age at exposure...
December 3, 2016: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/27914053/computational-protein-design-under-a-given-backbone-structure-with-the-abacus-statistical-energy-function
#16
Peng Xiong, Quan Chen, Haiyan Liu
An important objective of computational protein design is to identify amino acid sequences that stably fold into a given backbone structure. A general approach to this problem is to minimize an energy function in the sequence space. We have previously reported a method to derive statistical energies for fixed-backbone protein design and showed that it led to de novo proteins that fold as expected. Here, we present the usage of the program that implements this method, which we now name as ABACUS (A Backbone-based Amino aCid Usage Survey)...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27913929/-inpatient-multimodal-pain-therapy-additive-value-of-neuromuscular-core-stability-exercises-for-chronic-back-pain
#17
F Giesche, H Streicher, M Maiwald, P Wagner
INTRODUCTION: The medical and healthcare economic burden caused by chronic lumbar back pain (CLBP) requires the use of interdisciplinary treatment approaches. The present study aimed to evaluate whether the effectiveness of inpatient multimodal pain therapy (MPT, operations and procedures (OPS) coding 8-918.02), can be increased by implementing additional neuromuscular core stability exercises (NCSE). MATERIAL AND METHODS: As part of a prospective controlled study, subjects with CLBP (n = 48, 17 males, 58...
December 2, 2016: Der Schmerz
https://www.readbyqxmd.com/read/27913880/forensic-3d-documentation-of-skin-injuries
#18
Chiara Villa
An accurate and precise documentation of injuries is fundamental in a forensic pathological context. Photographs and manual measurements are taken of all injuries during autopsies, but ordinary photography projects a 3D wound on a 2D space. Using technologies such as photogrammetry, it is possible to create 3D detailed, to-scale, true-color documentation of skin injuries from 2D pictures. A comparison between the measurements of 165 lesions taken during autopsies and on photogrammetrically processed pictures was performed...
December 2, 2016: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/27913729/qsea-modelling-of-genome-wide-dna-methylation-from-sequencing-enrichment-experiments
#19
Matthias Lienhard, Sabrina Grasse, Jana Rolff, Steffen Frese, Uwe Schirmer, Michael Becker, Stefan Börno, Bernd Timmermann, Lukas Chavez, Holger Sültmann, Gunda Leschber, Iduna Fichtner, Michal R Schweiger, Ralf Herwig
Genome-wide enrichment of methylated DNA followed by sequencing (MeDIP-seq) offers a reasonable compromise between experimental costs and genomic coverage. However, the computational analysis of these experiments is complex, and quantification of the enrichment signals in terms of absolute levels of methylation requires specific transformation. In this work, we present QSEA, Quantitative Sequence Enrichment Analysis, a comprehensive workflow for the modelling and subsequent quantification of MeDIP-seq data...
December 1, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27913371/multiview-convolutional-neural-networks-for-multidocument-extractive-summarization
#20
Yong Zhang, Meng Joo Er, Rui Zhao, Mahardhika Pratama
Multidocument summarization has gained popularity in many real world applications because vital information can be extracted within a short time. Extractive summarization aims to generate a summary of a document or a set of documents by ranking sentences and the ranking results rely heavily on the quality of sentence features. However, almost all previous algorithms require hand-crafted features for sentence representation. In this paper, we leverage on word embedding to represent sentences so as to avoid the intensive labor in feature engineering...
November 28, 2016: IEEE Transactions on Cybernetics
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