keyword
MENU ▼
Read by QxMD icon Read
search

Statistical methods

keyword
https://www.readbyqxmd.com/read/28454303/expression-of-er%C3%AE-gene-in-breast-carcinoma-and-the-relevance-in-neoadjuvant-therapy
#1
Jing Chang, Jihong Liu, Huiying Li, Jing Li, Yanling Mu, Bin Feng
In the present study, we examined the expression of the estrogen receptor β (ERβ) gene in breast cancer and its relevance in neoadjuvant therapy. In total, 120 breast cancer patients who were hospitalized in the Departments of Breast Disease and Medical Oncology served as the subjects of this study. The subjects were diagnosed with breast cancer phase II to phase IIIA, as confirmed by aspiration biopsy and iconography. The patients were divided into two groups in a randomized control manner, with 60 patients in each group...
March 2017: Oncology Letters
https://www.readbyqxmd.com/read/28454235/metabolic-profiling-of-hepatitis-b-virus-related-hepatocellular-carcinoma-with-diverse-differentiation-grades
#2
Lei Zhang, Ya Huang, Mingjian Lian, Zhijuan Fan, Yaqiong Tian, Yufan Wang, Hua Kang, Shuang Liu, Shuye Liu, Tong Li, Zhongqiang Shan
The most effective diagnostic tool for the majority of hepatocellular carcinoma (HCC) patients is determining the differentiation grade of their tumors. However liver biopsies, which are currently the most effective way of determining tumor differentiation grade, have several limitations. The present study was designed to select serum characteristic metabolites that correlate with the differentiation grades of hepatitis B virus (HBV)-related HCC, and so could be used in the clinic as a non-invasive method of differentiating patients with different grades of HCC...
March 2017: Oncology Letters
https://www.readbyqxmd.com/read/28454083/comparison-of-long-term-outcome-between-hemicolectomy-and-partial-colectomy-in-the-elderly-a-large-population-based-study
#3
Xu Guan, Hanqing Hu, Wei Chen, Zheng Jiang, Zheng Liu, Zhixun Zhao, Yinggang Chen, Guiyu Wang, Xishan Wang
Due to large progress has been achieved in surgical techniques, anesthesia and perioperative care, it is accepted that the very elderly colon cancer (CC) patient is not contraindication for surgery. However, it is a controversy that an extended or a less aggressive surgical approach should be performed for this population. Here, we identified 28110 CC patients aged ≥80 from Surveillance, Epidemiology, and End-Results (SEER) database. The surgical approaches included extended hemicolectomy (HC) and partial colectomy (PC)...
April 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/28454053/source-identification-and-exchangeability-of-heavy-metals-accumulated-in-vegetable-soils-in-the-coastal-plain-of-eastern-zhejiang-province-china
#4
Xu Qiutong, Zhang Mingkui
Vegetable production in China is suffering increasingly heavy metal damages from various pollution sources including agricultural, industrial and other activities. It is of practical significance to understand the effects of human activities on the accumulation and exchangeability of soil heavy metals in vegetable fields. In this study, seventy-two arable layer samples of vegetable soils were collected from the Shaoxing coastal plain, a representative region of the coastal plain of eastern Zhejiang province, China for characterizing the effects of fertilization methods on accumulation and exchangeable heavy metals in soils (Exchangeable heavy metals in the soil samples were extracted by 0...
April 25, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28453958/the-novel-technique-of-post-hysterectomy-vaginal-vault-prolapse-repair-apical-sling-and-neocervix-formation
#5
Dmitry Shkarupa, Nikita Kubin, Ekaterina Shapovalova, Anastasiya Zaytseva, Alexey Pisarev, Olga Staroseltseva
OBJECTIVE: We primarily aimed to evaluate the effectiveness of the novel technique: bilateral sacrospinous fixation by monofilament polypropylene apical sling combined with "neocervix" formation in surgical treatment of post - hysterectomy vaginal vault prolapse. The secondary objective was to estimate the impact of the surgery on voiding function and quality of life. STUDY DESIGN: This prospective study involved 61 women suffering from post-hysterectomy prolapse...
April 23, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/28453686/the-null-hypothesis-of-gsea-and-a-novel-statistical-model-for-competitive-gene-set-analysis
#6
Birgit Debrabant
Motivation: Competitive gene set analysis intends to assess whether a specific set of genes is more associated with a trait than the remaining genes. However, the statistical models assumed to date to underly these methods do not enable a clear cut formulation of the competitive null hypothesis. This is a major handicap to the interpretation of results obtained from a gene set analysis. Results: This work presents a hierarchical statistical model based on the notion of dependence measures, which overcomes this problem...
May 1, 2017: Bioinformatics
https://www.readbyqxmd.com/read/28453678/chainy-an-universal-tool-for-standardized-relative-quantification-in-real-time-pcr
#7
Izaskun Mallona, Anna Díez-Villanueva, Berta Martín, Miguel A Peinado
Summary: Chainy is a cross-platform web tool providing systematic pipelines and steady criteria to process real-time PCR data, including the calculation of efficiencies from raw data by kinetic methods, evaluation of the suitability of multiple references, standardized normalization using one or more references, and group-wise relative quantification statistical testing. We illustrate the utility of Chainy for differential expression and chromatin immunoprecipitation enrichment (ChIP-QPCR) analysis...
May 1, 2017: Bioinformatics
https://www.readbyqxmd.com/read/28453674/ntcard-a-streaming-algorithm-for-cardinality-estimation-in-genomics-data
#8
Hamid Mohamadi, Hamza Khan, Inanc Birol
Motivation: Many bioinformatics algorithms are designed for the analysis of sequences of some uniform length, conventionally referred to as k -mers. These include de Bruijn graph assembly methods and sequence alignment tools. An efficient algorithm to enumerate the number of unique k -mers, or even better, to build a histogram of k -mer frequencies would be desirable for these tools and their downstream analysis pipelines. Among other applications, estimated frequencies can be used to predict genome sizes, measure sequencing error rates, and tune runtime parameters for analysis tools...
May 1, 2017: Bioinformatics
https://www.readbyqxmd.com/read/28453667/linearity-of-network-proximity-measures-implications-for-set-based-queries-and-significance-testing
#9
Sean Maxwell, Mark R Chance, Mehmet Koyutürk
Motivation: In recent years, various network proximity measures have been proposed to facilitate the use of biomolecular interaction data in a broad range of applications. These applications include functional annotation, disease gene prioritization, comparative analysis of biological systems and prediction of new interactions. In such applications, a major task is the scoring or ranking of the nodes in the network in terms of their proximity to a given set of 'seed' nodes (e.g. a group of proteins that are identified to be associated with a disease, or are deferentially expressed in a certain condition)...
May 1, 2017: Bioinformatics
https://www.readbyqxmd.com/read/28453666/inequalities-in-rural-communities-adapting-national-deprivation-indices-for-rural-settings
#10
D Fecht, A Jones, T Hill, T Lindfield, R Thomson, A L Hansell, R Shukla
Background: Deprivation indices have been widely used in healthcare research and planning in the United Kingdom. Existing indices, however, are dominated by characteristics of urban populations that may be less relevant in capturing the nature of rural deprivation. We explore if deprivation indices can be modified to make them more sensitive to displaying rural disadvantage in England. Methods: The analysis focussed on the 2011 Carstairs Index (Carstairs2011) and the 2010 English Index of Multiple Deprivation (IMD2010)...
April 27, 2017: Journal of Public Health
https://www.readbyqxmd.com/read/28453653/the-bologna-annotation-resource-bar-3-0-improving-protein-functional-annotation
#11
Giuseppe Profiti, Pier Luigi Martelli, Rita Casadio
BAR 3.0 updates our server BAR (Bologna Annotation Resource) for predicting protein structural and functional features from sequence. We increase data volume, query capabilities and information conveyed to the user. The core of BAR 3.0 is a graph-based clustering procedure of UniProtKB sequences, following strict pairwise similarity criteria (sequence identity ≥40% with alignment coverage ≥90%). Each cluster contains the available annotation downloaded from UniProtKB, GO, PFAM and PDB. After statistical validation, GO terms and PFAM domains are cluster-specific and annotate new sequences entering the cluster after satisfying similarity constraints...
April 27, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28453517/a-comparison-of-multiple-testing-adjustment-methods-with-block-correlation-positively-dependent-tests
#12
John R Stevens, Abdullah Al Masud, Anvar Suyundikov
In high dimensional data analysis (such as gene expression, spatial epidemiology, or brain imaging studies), we often test thousands or more hypotheses simultaneously. As the number of tests increases, the chance of observing some statistically significant tests is very high even when all null hypotheses are true. Consequently, we could reach incorrect conclusions regarding the hypotheses. Researchers frequently use multiplicity adjustment methods to control type I error rates-primarily the family-wise error rate (FWER) or the false discovery rate (FDR)-while still desiring high statistical power...
2017: PloS One
https://www.readbyqxmd.com/read/28453472/the-2002-nimh-provisional-diagnostic-criteria-for-depression-of-alzheimer-s-disease-pdc-dad-gauging-their-validity-over-a-decade-later
#13
Amir A Sepehry, Philip E Lee, Ging-Yuek R Hsiung, B Lynn Beattie, Howard H Feldman, Claudia Jacova
Presented herein is evidence for criterion, content, and convergent/discriminant validity of the NIMH-Provisional Diagnostic Criteria for depression of Alzheimer's Disease (PDC-dAD) that were formulated to address depression in Alzheimer's disease (AD). Using meta-analytic and systematic review methods, we examined criterion validity evidence in epidemiological and clinical studies comparing the PDC-dAD to Diagnostic and Statistical Manual of Mental Disorders fourth edition (DSM-IV), and International Classification of Disease (ICD 9) depression diagnostic criteria...
April 28, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28453433/diagnostic-accuracy-of-selective-3-t-mr-neurography-guided-retroperitoneal-genitofemoral-nerve-blocks-for-the-diagnosis-of-genitofemoral-neuralgia
#14
Jan Fritz, A Lee Dellon, Eric H Williams, Gedge D Rosson, Allan J Belzberg, Frederick E Eckhauser
Purpose To determine if 3-T magnetic resonance (MR) neurography-guided retroperitoneal genitofemoral nerve (GFN) blocks are safe and effective for the diagnosis of genitofemoral neuralgia. Materials and Methods Following institutional review board approval and informed consent, 26 subjects (16 men, 10 women; mean age, 42 years [range, 24-78 years]; mean body mass index, 28 kg/m(2) [range, 20-35 kg/m(2)]) with intractable groin pain were included. By using a 3-T MR imaging system, intermediate-weighted turbo spin-echo pulse sequences, and MR-conditional needles, diagnostic MR neurography-guided GFN blocks were performed in the retroperitoneum...
April 28, 2017: Radiology
https://www.readbyqxmd.com/read/28453257/one-filter-one-sample-and-the-n-and-o-glyco-proteo-me-towards-a-system-to-study-disorders-of-protein-glycosylation
#15
Kirsty Skeene, Matthew Walker, Graham Clarke, Ed Bergstrom, Paul Genever, Daniel Ungar, Jane Thomas-Oates
A method has been developed for release/isolation of O-glycans from glycoproteins in whole cell lysates, for mass spectrometric analysis. Cells are lysed in SDS, which is then exchanged for urea and ammonium bicarbonate in a centrifugal filter, before treating with NH4OH to release O-glycans. Following centrifugation, O-glycans are recovered in the filtrate. Sonication achieves O-glycan release in 1 h. Combining the established protocol for filter-aided N-glycan separation, here optimised for enhanced PNGase F efficiency, with the developed O-glycan release method allows analysis of both N- and O-glycans from one sample, in the same filter unit, from 0...
April 28, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28449317/a-comparison-of-individual-based-genetic-distance-metrics-for-landscape-genetics
#16
A J Shirk, E L Landguth, S A Cushman
A major aim of landscape genetics is to understand how landscapes resist gene flow and thereby influence population genetic structure. An empirical understanding of this process provides a wealth of information that can be used to guide conservation and management of species in fragmented landscapes, and also to predict how landscape change may affect population viability. Statistical approaches to infer the true model among competing alternatives are based on the strength of the relationship between pairwise genetic distances and landscape distances among sampled individuals in a population...
April 27, 2017: Molecular Ecology Resources
https://www.readbyqxmd.com/read/28449307/the-efficacy-of-non-narcotic-analgesics-on-postoperative-endodontic-pain-a-systematic-review-and-meta-analysis
#17
REVIEW
Armin Shirvani, Sayna Shamszadeh, Mohammad Jafar Eghbal, Saeed Asgary
The objective of this review was to evaluate the efficacy of non-narcotic analgesics including non-steroidal anti-inflammatory drugs (NSAIDs) and/or paracetamol in the treatment of postoperative endodontic pain. Additionally, we aimed to examine the possible association of study covariates on the pain scores using meta-regression analysis. An electronic search was performed in 2016. After data extraction and quality assessment of the included studies (n=27, representing 2188 patients), meta-analysis was performed using a random-effect inverse-variance method...
April 27, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28449212/predictors-of-success-of-external-cephalic-version-and-cephalic-presentation-at-birth-among-1-253-women-with-non-cephalic-presentation-using-logistic-regression-and-classification-tree-analyses
#18
Eileen K Hutton, Julia C Simioni, Lehana Thabane
INTRODUCTION: Among women with a fetus in non-cephalic presentation, external cephalic version (ECV) has been shown to reduce the rate of breech presentation at birth and cesarean birth. Compared to ECV at term, beginning ECV prior to 37 weeks gestation decreases the number of infants in a non-cephalic presentation at birth. The purpose of this secondary analysis was to investigate factors associated with a successful ECV procedure and to present this in a clinically useful format. MATERIAL AND METHODS: Data were collected as part of the Early ECV Pilot and Early ECV2 Trials, which randomised 1,776 women with a fetus in breech presentation to either early ECV (34 to 36 weeks gestation) or delayed ECV (at or after 37 weeks)...
April 27, 2017: Acta Obstetricia et Gynecologica Scandinavica
https://www.readbyqxmd.com/read/28449169/analysis-of-liver-tumors-using-preoperative-and-intraoperative-contrast-enhanced-ultrasound-ceus-ioceus-by-radiologists-in-comparison-to-magnetic%C3%A2-resonance-imaging-and-histopathology
#19
Severin Huf, Natascha Platz Batista da Silva, Isabel Wiesinger, Matthias Hornung, Marcus N Scherer, Sven Lang, Christian Stroszczynski, Thomas Fischer, Ernst Michael Jung
Purpose To evaluate the diagnostic significance of preoperatively and intraoperatively performed contrast-enhanced ultrasound (CEUS/IOCEUS) in the diagnosis of liver tumors in comparison to magnetic resonance imaging (MRI) and histopathology. Materials and Methods Retrospective analysis of 70/317 patients who underwent surgery for liver tumors between January 2012 and October 2015. Findings of CEUS and IOCEUS were compared to MRI. CEUS and IOCEUS were performed using multifrequency linear probes (1 - 5, 6 - 15 MHz) after bolus injection of 1 - 5 ml sulfur hexafluoride microbubbles...
May 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/28449018/accuracy-of-ethnicity-data-recorded-in-hospital-based-patient-clinical-records-and-the-australia-and-new-zealand-dialysis-and-transplant-registry
#20
Matthew Page, Emma H Wyeth, Ari Samaranayaka, Bronwen McNoe, Rachael Walker, John Schollum, Mark Marshall, Robert Walker, Sarah Derrett
AIM: Sustained health inequities are experienced by indigenous and minority populations. Accurate ethnicity data are fundamental to healthcare planning and provision and monitoring of health outcomes to address such inequities. This study investigated the accuracy of ethnicity data in a large clinical registry of end-stage kidney disease patients (the Australia and New Zealand Dialysis and Transplant Registry; ANZDATA) and hospital-based patient clinical records compared with self-reported ethnicity data collected in the 'Dialysis Outcomes in those aged ≥65 years' (DOS65+) study...
April 28, 2017: New Zealand Medical Journal
keyword
keyword
88235
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"