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Statistical model

Feng Peng, Yingzi Liu, Chenjie He, Yi Kong, Qianying Ouyang, Xiaonv Xie, Tong Liu, Zhaoqian Liu, Jingbo Peng
Lung cancer is the common cause of cancer-related death worldwide. Platinum-based chemotherapy is the cornerstone of treatment for lung cancer. Platinum sensitivity is a major possibility for effective cancer treatment. In this study, several potential biomarkers were identified for evaluating and predicting the response to platinum-based chemotherapy. LC-MS-based metabolomics was performed on plasma samples from 43 lung cancer patients with different chemotherapy efficacy. By combing multivariate statistical analysis, pathway analysis with correlation analysis, 8 potential biomarkers were significantly associated with platinum chemotherapy response...
February 23, 2018: Journal of Pharmaceutical and Biomedical Analysis
Yeon Jung Kim, Rafael Rafael de Molon, Fausto Rioiti Horiguti, Guilherme Piragine Contador, Marco Antonio Coelho, Vinicius Ibiapina Mascarenhas, Ana Paula de Souza Faloni, Joni Augusto Cirelli, Wilson Roberto Sendyk
PURPOSE: The objective of this investigation was to assess vertical bone augmentation using deproteinized bovine bone mineral (DBBM) infused or not with recombinant human bone morphogenetic protein (rhBMP-2) in rabbit tibiae. MATERIALS AND METHODS: A total of 18 female rabbits (New Zealand) received two blocks of DBBM in each tibia. The DBBM blocks were randomly assigned into four experimental groups: DBBM (only the bone graft); DBBM associated with absorbable collagen sponge (ACS); DBBM plus rhBMP-2 (1...
March 15, 2018: International Journal of Oral & Maxillofacial Implants
Minah Han, Byeongjoon Kim, Jongduk Baek
We investigate the detectability of breast cone beam computed tomography images using human and model observers and the variations of exponent, β, of the inverse power-law spectrum for various reconstruction filters and interpolation methods in the Feldkamp-Davis-Kress (FDK) reconstruction. Using computer simulation, a breast volume with a 50% volume glandular fraction and a 2mm diameter lesion are generated and projection data are acquired. In the FDK reconstruction, projection data are apodized using one of three reconstruction filters; Hanning, Shepp-Logan, or Ram-Lak, and back-projection is performed with and without Fourier interpolation...
2018: PloS One
Arran Hamlet, Kévin Jean, William Perea, Sergio Yactayo, Joseph Biey, Maria Van Kerkhove, Neil Ferguson, Tini Garske
BACKGROUND: Yellow fever virus (YFV) is a vector-borne flavivirus endemic to Africa and Latin America. Ninety per cent of the global burden occurs in Africa where it is primarily transmitted by Aedes spp, with Aedes aegypti the main vector for urban yellow fever (YF). Mosquito life cycle and viral replication in the mosquito are heavily dependent on climate, particularly temperature and rainfall. We aimed to assess whether seasonal variations in climatic factors are associated with the seasonality of YF reports...
March 2018: PLoS Neglected Tropical Diseases
Kamil E Barbour, Susan Moss, Janet B Croft, Charles G Helmick, Kristina A Theis, Teresa J Brady, Louise B Murphy, Jennifer M Hootman, Kurt J Greenlund, Hua Lu, Yan Wang
PROBLEM/CONDITION: Doctor-diagnosed arthritis is a common chronic condition affecting an estimated 23% (54 million) of adults in the United States, greatly influencing quality of life and costing approximately $300 billion annually. The geographic variations in arthritis prevalence, health-related characteristics, and management among states and territories are unknown. Therefore, public health professionals need to understand arthritis in their areas to target dissemination of evidence-based interventions that reduce arthritis morbidity...
March 16, 2018: MMWR. Surveillance Summaries: Morbidity and Mortality Weekly Report. Surveillance Summaries
Justyna Bartoszko, Duminda N Wijeysundera, Keyvan Karkouti, Jeannie Callum, Vivek Rao, Mark Crowther, Hilary P Grocott, Ruxandra Pinto, Damon C Scales, Blaine Achen, Sukhpal Brar, Doug Morrison, David Wong, Jean S Bussières, Tonya de Waal, Christopher Harle, Étienne de Médicis, Charles McAdams, Summer Syed, Diem Tran, Terry Waters
BACKGROUND: Research into major bleeding during cardiac surgery is challenging due to variability in how it is scored. Two consensus-based clinical scores for major bleeding: the Universal definition of perioperative bleeding and the European Coronary Artery Bypass Graft (E-CABG) bleeding severity grade, were compared in this substudy of the Transfusion Avoidance in Cardiac Surgery (TACS) trial. METHODS: As part of TACS, 7,402 patients underwent cardiac surgery at 12 hospitals from 2014 to 2015...
March 15, 2018: Anesthesiology
So Yoon Han, Nan Hee Kim, Do Hoon Kim, Kyungdo Han, Seon Mee Kim
BACKGROUND: The prevalence of childhood obesity has significantly increased in Korea. This study aimed to use data from the 2010 Korea National Health and Nutrition Examination Survey (KNHANES) to investigate the association between sodium (Na) intake and insulin resistance in children and adolescents with obesity. METHODS: The study population consisted of 578 adolescents aged 12-18 years who were enrolled in the 2010 KNHANES. Subjects were classified into the following four groups based on their body mass index (BMI) and homeostatic model assessment-insulin resistance (HOMA-IR) values: normal BMI and HOMA-IR (Group 1), normal BMI and ≥75% HOMA-IR (Group 2), ≥85% BMI and normal HOMA-IR (Group 3) and ≥85% BMI and ≥75% HOMA-IR (Group 4)...
March 15, 2018: Journal of Pediatric Endocrinology & Metabolism: JPEM
Efrat L Amitay, Agne Krilaviciute, Hermann Brenner
Colorectal cancer (CRC) is a leading cause of cancer morbidity and mortality. Dysbiosis in the gut microbiota may be associated with CRC. This systematic review focuses on differences in gut microbial community between people diagnosed with CRC or adenoma and healthy individuals using fecal samples, emphasizing non-invasive fecal microbiome models for CRC early diagnosis. Nineteen studies were identified in a systematic literature search of Pubmed, Web of Science and ScienceDirect. Several bacteria were reported to differ in abundance between CRC and adenoma cases and healthy controls, with Fusobacterium the most common...
March 15, 2018: Gut Microbes
Farzad Jalali, Seyedeh Fatemeh Hashemi
BACKGROUND: From one hand, depression is one of the symptoms that occur after abstinence from methamphetamine. On the other people living with HIV/AIDS are in isolation due to the nature of their illness and depression is one of the most common mental health problems they experience. OBJECTIVES: This study was aimed at determining the effectiveness of saffron on reducing depression among recovered consumers of methamphetamine living with HIV/AIDS. METHODS: The design of this study was semi-experimental with pre-test, post-test and control (placebo) groups...
March 15, 2018: Substance Use & Misuse
Jong Pil Yoon, Chang-Hwa Lee, Jae Wook Jung, Hyun-Joo Lee, Yong-Soo Lee, Ja-Yeon Kim, Ga Young Park, Jin Hyun Choi, Seok Won Chung
BACKGROUND: The failure rate for healing after rotator cuff repair is relatively high. PURPOSE: To establish a system for sustained release of transforming growth factor β1 (TGF-β1) using an alginate scaffold and evaluate the effects of the sustained release of TGF-β1 on rotator cuff healing in a rabbit model. STUDY DESIGN: Controlled laboratory study. METHODS: Before the in vivo animal study, a standard MTS assay was performed to evaluate cell proliferation and metabolic activity on the alginate scaffold...
March 1, 2018: American Journal of Sports Medicine
Kimberley Lau, Joseph Wilkinson, Ram Moorthy
OBJECTIVE: Following the announcement of the NHS Cancer Plan in 2000, anyone suspected of having cancer has to be seen by a specialist within two weeks of referral. Since this introduction, studies have shown that only 6.3-14.6% of 2-week referrals were diagnosed with a head and neck cancer and that majority of the cancer diagnoses were via other referral routes. These studies suggest that the referral scheme is not currently cost effective. Our aim is to develop a scoring system that determines the risk of head and neck cancer in a patient, which can then be used to aid GP referrals...
March 15, 2018: Clinical Otolaryngology
Zachary H Marion, James A Fordyce, Benjamin M Fitzpatrick
Recently there have been major theoretical advances in the quantification and partitioning of diversity within and among communities, regions, and ecosystems. However, applying those advances to real data remains a challenge. Ecologists often end up describing their samples rather than estimating the diversity components of an underlying study system, and existing approaches do not easily provide statistical frameworks for testing ecological questions. Here we offer one avenue to do all of the above using a hierarchical Bayesian approach...
March 15, 2018: Ecology
Lawrence Mj Best, Yemisi Takwoingi, Sulman Siddique, Abiram Selladurai, Akash Gandhi, Benjamin Low, Mohammad Yaghoobi, Kurinchi Selvan Gurusamy
BACKGROUND: Helicobacter pylori (H pylori) infection has been implicated in a number of malignancies and non-malignant conditions including peptic ulcers, non-ulcer dyspepsia, recurrent peptic ulcer bleeding, unexplained iron deficiency anaemia, idiopathic thrombocytopaenia purpura, and colorectal adenomas. The confirmatory diagnosis of H pylori is by endoscopic biopsy, followed by histopathological examination using haemotoxylin and eosin (H & E) stain or special stains such as Giemsa stain and Warthin-Starry stain...
March 15, 2018: Cochrane Database of Systematic Reviews
M Portelli, A Lucchese, A Lo Giudice, A Militi, P Spinuzza, A M Bellocchio, R Nucera, S Croce, G Ghilardi, M Manuelli
In straight-wire mechanics, friction can significantly influence the forces expressed by wires. The aim of this study is to assess whether the aging and the sum of elastomeric ligatures affect the static friction during orthodontic space closure. A 0.017x 0.025-in SS was drawn throughout a 3-bracket experimental model and engaged with elastomeric ligatures. Before performing the test, the ligatures were soaked in artificial saliva for 48 hours (Group 1), 2 weeks (Group 2) and 4 weeks (Group 3); brand-new ligatures were also tested as control group (Group 4)...
March 15, 2018: Journal of Biological Regulators and Homeostatic Agents
Ethan Leng, Benjamin Spilseth, Lin Zhang, Jin Jin, Joseph S Koopmeiners, Gregory J Metzger
PURPOSE: Computer-aided detection/diagnosis (CAD) of prostate cancer (PCa) on multipara-metric MRI (mpMRI) is an active area of research. In the literature, the performance of predictive models trained to detect PCa on mpMRI has typically been reported in terms of voxel-wise mea-sures such as sensitivity and specificity and/or area under the receiver operating curve (AUC).However, it is unclear whether models that score higher by these measures are actually superior.Here, we propose a novel method for lesion identification as well as novel measures that assess the quality of the detected lesions...
March 15, 2018: Medical Physics
John W Garrett, Yinsheng Li, Ke Li, Guang-Hong Chen
PURPOSE: Digital breast tomosynthesis (DBT) has been shown to somewhat alleviate the breast tissue overlapping issues of two dimensional (2D) mammography.However, the improvement in current DBT systems over mammography is still limited.Statistical image reconstruction (SIR) methods have the potential to reduce through-plane artifacts in DBT, and thus may be used to further reduce anatomical clutter. The purpose of this work was to study the impact of SIR on anatomical clutter in the reconstructed DBT image volumes...
March 15, 2018: Medical Physics
Reşat Duman, Ayhan Vurmaz
PURPOSE: The exact etiopathogenesis of steroid-induced cataracts (SIC) is not known. Although oxidative stress is one of the most acceptable hypotheses, the exact molecular events in steroid-induced oxidative events in the lens need to be clarified. In addition, to the best of our knowledge, the innate immune system components in SIC formation have not been studied previously. The aim of the present study was to study the oxidative system and the innate immune system components in the cataractous lenses of a developing chick embryo SIC model...
March 15, 2018: Cutaneous and Ocular Toxicology
Xiaobo Wang, Yinan Wang, Ronggang Xi, Yuanyuan Wang, Xiaobo Yang
The optimization of process parameters of spray-dried powder containing fanhuncaoin, a newly discovered antiinflammatorily active phenolic acid isolated from Chinese herb, was conducted using response surface methodology (RSM). The experimental results were fitted into partial cubic polynomial model to describe and predict the response quality in terms of the final angle of repose, aerodynamic diameter, respirable fraction (RF) and yield. The recommended optimum spray-drying parameters for development of fanhuncaoin powder with optimum quality were 110 °C inlet temperature, 0...
March 15, 2018: Drug Development and Industrial Pharmacy
Baek Gyu Jun, Woong Cheul Lee, Jae Young Jang, Soung Won Jeong, Young Don Kim, Gab Jin Cheon, Yun Nah Lee, Sang Gyune Kim, Young Seok Kim, Young Sin Cho, Sae Hwan Lee, Hong Soo Kim
BACKGROUND: Spontaneous bacterial peritonitis (SBP) is one of the severe complications of liver cirrhosis. Early detection of high-risk patients is essential for prognostic improvement. The aim of this study is to investigate the predictive factors related to in-hospital mortality in patients with SBP. METHODS: This was a retrospective study of 233 SBP patients (181 males, 52 females) who were admitted to four tertiary referral hospitals between August 2002 and February 2013...
March 19, 2018: Journal of Korean Medical Science
Sezen Cekic, Didier Grandjean, Olivier Renaud
This article proposes a systematic methodological review and an objective criticism of existing methods enabling the derivation of time, frequency, and time-varying Granger-causality statistics in neuroscience. The capacity to describe the causal links between signals recorded at different brain locations during a neuroscience experiment is indeed of primary interest for neuroscientists, who often have very precise prior hypotheses about the relationships between recorded brain signals. The increasing interest and the huge number of publications related to this topic calls for this systematic review, which describes the very complex methodological aspects underlying the derivation of these statistics...
March 15, 2018: Statistics in Medicine
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