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Calibration logistic regression

Daniel Schwarzkopf, Carolin Fleischmann-Struzek, Hendrik Rüddel, Konrad Reinhart, Daniel O Thomas-Rüddel
BACKGROUND: Sepsis is a major cause of preventable deaths in hospitals. Feasible and valid methods for comparing quality of sepsis care between hospitals are needed. The aim of this study was to develop a risk-adjustment model suitable for comparing sepsis-related mortality between German hospitals. METHODS: We developed a risk-model using national German claims data. Since these data are available with a time-lag of 1.5 years only, the stability of the model across time was investigated...
2018: PloS One
Farzad Masoudkabir, Ali Vasheghani-Farahani, Elham Hakki, Hamidreza Poorhosseini, Saeed Sadeghian, Seyed Hesameddin Abbasi, Shahram Bahmanyar, Seyed Ebrahim Kassaian
A major diagnostic challenge for cardiologists is to distinguish cardiac syndrome X (CSX) from obstructive coronary artery disease in women with typical angina and a positive exercise tolerance test (ETT). We performed this study to develop a scoring system that more accurately predicts CSX in this patient population. Data on 976 women with typical angina and a positive ETT who underwent coronary angiography at our center were randomly divided into derivation and validation datasets. We developed a backward stepwise logistic regression model that predicted the presence of CSX, and a scoring system was derived from it...
February 2018: Texas Heart Institute Journal
Vincent Auffret, Yves Cottin, Guillaume Leurent, Martine Gilard, Jean-Claude Beer, Amer Zabalawi, Frédéric Chagué, Emanuelle Filippi, Damien Brunet, Jean-Philippe Hacot, Philippe Brunel, Mourad Mejri, Luc Lorgis, Gilles Rouault, Philippes Druelles, Jean-Christophe Cornily, Romain Didier, Emilie Bot, Bertrand Boulanger, Isabelle Coudert, Aurélie Loirat, Marc Bedossa, Dominique Boulmier, Maud Maza, Marielle Le Guellec, Rishi Puri, Marianne Zeller, Hervé Le Breton
Aims: To derive and validate a readily useable risk score to identify patients at high-risk of in-hospital ST-segment elevation myocardial infarction (STEMI)-related cardiogenic shock (CS). Methods and results: In all, 6838 patients without CS on admission and treated by primary percutaneous coronary intervention (pPCI), included in the Observatoire Régional Breton sur l'Infarctus (ORBI), served as a derivation cohort, and 2208 patients included in the obseRvatoire des Infarctus de Côte-d'Or (RICO) constituted the external validation cohort...
March 15, 2018: European Heart Journal
Yawei Gu, Yunlang She, Chenyang Dai, Yijiu Ren, Ziwen Fan, Huiyuan Zhu, Xiwen Sun, Huikang Xie, Gening Jiang, Dong Xie, Chang Chen
BACKGROUND: Some clinical N0 lung adenocarcinoma have been pathologically diagnosed as N1 or N2. To improve the preoperative diagnostic accuracy of lymph node (LN) disease, we developed a prediction model for LN metastasis in cT1N0M0 lung adenocarcinoma based on computed tomography (CT) texture analysis and clinical characteristics to estimate the probability of LN metastasis. METHODS: The records of 501 consecutive patients with cT1N0M0 lung adenocarcinoma who underwent CT scan and pulmonary resection with systematic lymph nodes dissection or lymph nodes sampling were reviewed...
March 14, 2018: Annals of Thoracic Surgery
Yuhong Xiang, Jean Donley, Elena Seletskaia, Sonal Shingare, John Kamerud, Boris Gorovits
In ligand binding assays (LBA), the concentration to response data is a nonlinear relationship driven by the law of mass action. Four parameter logistic (4PL) and five parameter logistic (5PL) curve fitting models are two widely accepted and validated models for LBA calibration curve data. Selection of the appropriate regression model and weighting function are key components of LBA development. Assessment of selected model and weighting function should be performed during assay development and confirmed later during validation...
March 13, 2018: AAPS Journal
Clark DuMontier, Kerri M Clough-Gorr, Rebecca A Silliman, Andreas E Stuck, André Moser
OBJECTIVES: To develop a predictive model and risk score for 10-year mortality using health-related quality of life (HRQOL) in a cohort of older women with early-stage breast cancer. DESIGN: Prospective cohort. SETTING: Community. PARTICIPANTS: U.S. women aged 65 and older diagnosed with Stage I to IIIA primary breast cancer (N=660). MEASUREMENTS: We used medical variables (age, comorbidity), HRQOL measures (10-item Physical Function Index and 5-item Mental Health Index from the Medical Outcomes Study (MOS) 36-item Short-Form Survey; 8-item Modified MOS Social Support Survey), and breast cancer variables (stage, surgery, chemotherapy, endocrine therapy) to develop a 10-year mortality risk score using penalized logistic regression models...
March 13, 2018: Journal of the American Geriatrics Society
Xiaohan Liu, Pei Shen, Xiangyu Wang, Shanyong Zhang, Jiawei Zheng, Chi Yang
This study aimed to establish an effective prognostic nomogram for predicting the probability of postoperative bone remodeling of patients with anterior disc displacement without reduction (ADDWoR). The nomogram was based on a retrospective study on patients underwent surgical approaches for ADDWoR at Shanghai Ninth People's Hospital, Shanghai Jiao Tong University from January, 2007 to January, 2017. A multivariate logistic regression analysis was used to develop variables suitable for probability estimation model...
March 12, 2018: Scientific Reports
Jejo D Koola, Sharon E Davis, Omar Al-Nimri, Sharidan K Parr, Daniel Fabbri, Bradley A Malin, Samuel B Ho, Michael E Matheny
OBJECTIVE: Hepatorenal Syndrome (HRS) is a devastating form of acute kidney injury (AKI) in advanced liver disease patients with high morbidity and mortality, but phenotyping algorithms have not yet been developed using large electronic health record (EHR) databases. We evaluated and compared multiple phenotyping methods to achieve an accurate algorithm for HRS identification. MATERIALS AND METHODS: A national retrospective cohort of patients with cirrhosis and AKI admitted to 124 Veterans Affairs hospitals was assembled from electronic health record data collected from 2005 to 2013...
March 9, 2018: Journal of Biomedical Informatics
Maria Thor, Andrew Jackson, Michael J Zelefsky, Gunnar Steineck, Asa Karlsdòttir, Morten Høyer, Mitchell Liu, Nicola J Nasser, Stine E Petersen, Vitali Moiseenko, Joseph O Deasy
PURPOSE: To investigate whether inter-institutional cohort analysis uncovers more reliable dose-response relationships exemplified for late rectal bleeding (LRB) following prostate radiotherapy. MATERIAL AND METHODS: Data from five institutions were used. Rectal dose-volume histograms (DVHs) for 989 patients treated with 3DCRT or IMRT to 70-86.4 Gy@1.8-2.0 Gy/fraction were obtained, and corrected for fractionation effects (α/β = 3 Gy). Cohorts with best-fit Lyman-Kutcher-Burman volume-effect parameter a were pooled after calibration adjustments of the available LRB definitions...
March 9, 2018: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
Nampet Jampathong, Malinee Laopaiboon, Siwanon Rattanakanokchai, Porjai Pattanittum
BACKGROUND: Prognostic models have been increasingly developed to predict complete recovery in ischemic stroke. However, questions arise about the performance characteristics of these models. The aim of this study was to systematically review and synthesize performance of existing prognostic models for complete recovery in ischemic stroke. METHODS: We searched journal publications indexed in PUBMED, SCOPUS, CENTRAL, ISI Web of Science and OVID MEDLINE from inception until 4 December, 2017, for studies designed to develop and/or validate prognostic models for predicting complete recovery in ischemic stroke patients...
March 9, 2018: BMC Neurology
Iris Veen, D Killian, L Vlaminck, J C M Vernooij, W Back
BACKGROUND: Debate surrounds the use of high rein tension for obtaining different head and neck positions in the training of sport horses on account of possible welfare issues. OBJECTIVES: To compare auxiliary rein tension in two methods for obtaining a standardized head and neck position on a hard and a soft surface; Draw Reins and Concord Leader. STUDY DESIGN: Intervention study. METHODS: Left and right rein tensions were measured in 11 base-level trained client-owned sport horses (mean age ± standard deviation: 10 ± 3...
March 8, 2018: Equine Veterinary Journal
Ingrid Roscher, Ragnhild S Falk, Linda Vos, Ole P F Clausen, Per Helsing, Petter Gjersvik, Trude E Robsahm
Importance: Cutaneous squamous cell carcinoma (cSCC) has metastatic potential, but the prognostic value of current staging systems in nonselected patients is uncertain. Objective: To assess the effect of risk factors for metastasis and to evaluate validity and usefulness of 4 staging systems for cSCC using population-based data. Design, Setting, and Participants: This was a nationwide, population-based, nested case-control study. The Cancer Registry of Norway, which receives compulsory data on all cancers in the Norwegian population of approximately 5...
March 7, 2018: JAMA Dermatology
Kali S Thomas, Jessica A Ogarek, Joan M Teno, Pedro L Gozalo, Vincent Mor
Purpose: To develop a score to predict mortality using the Minimum Data Set 3.0 (MDS 3.0) that can be readily calculated from items collected during nursing home (NH) residents' admission assessments. Participants: We developed a training cohort of Medicare beneficiaries newly admitted to U.S. NHs during 2012 (N=1,426,815) and a testing cohort from 2013 (N=1,160,964). Methods: Data came from the MDS 3.0 assessments linked to the Medicare Beneficiary Summary File...
March 5, 2018: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
Joshua Myers, Joseph Kei, Sreedevi Aithal, Venkatesh Aithal, Carlie Driscoll, Asaduzzaman Khan, Alehandrea Manuel, Anjali Joseph, Alicja N Malicka
OBJECTIVES: Wideband acoustic immittance (WAI) is an emerging test of middle-ear function with potential applications for neonates in screening and diagnostic settings. Previous large-scale diagnostic accuracy studies have assessed the performance of WAI against evoked otoacoustic emissions, but further research is needed using a more stringent reference standard. Research into suitable quantitative techniques to analyze the large volume of data produced by WAI is still in its infancy...
March 3, 2018: Ear and Hearing
R Constance Wiener, Chan Shen, Patricia Findley, Xi Tan, Usha Sambamoorthi
Purpose: Excessive fluoride ingestion has been associated with dental fluorosis. The purpose of this study was to determine if there was a difference in dental fluorosis prevalence comparing National Health and Nutrition Examination Survey (NHANES) trend data for adolescents, aged 16 and 17 years, when compared to data collected in 2001-2002 to data from 2011-2012. Methods: The sample included 875 participants. Data analyses included Chi square tests and logistic regressions. The data were from a nationally representative survey by calibrated dental examiners using the modified Dean's fluorosis classification system...
February 2018: Journal of Dental Hygiene: JDH
V Schetinin, L Jakaite, W Krzanowski
INTRODUCTION: For making reliable decisions, practitioners need to estimate uncertainties that exist in data and decision models. In this paper we analyse uncertainties of predicting survival probability for patients in trauma care. The existing prediction methodology employs logistic regression modelling of Trauma and Injury Severity Score (TRISS), which is based on theoretical assumptions. These assumptions limit the capability of TRISS methodology to provide accurate and reliable predictions...
April 2018: International Journal of Medical Informatics
T O Omóbòwálé, B N Ogunro, E A Odigie, P I Otuh, B O Olugasa
Accurate determination of temperature is crucial in the diagnosis of febrile conditions. Although fewer techniques have proven as useful and reliable a predictor of core body temperature as the rectal thermometry, the process of obtaining the rectal temperature could be stressful in dogs. The infrared thermometry is a noncontact device used for measuring body temperature, with advantages which include speed, convenience, and reduced stress to the animals and reduced occupational risks to the animal handler...
December 30, 2017: Nigerian Journal of Physiological Sciences: Official Publication of the Physiological Society of Nigeria
Eliza W Beal, Dmitry Tumin, Jeffery Chakedis, Erica Porter, Dimitrios Moris, Xu-Feng Zhang, Sherif Abdel-Misih, Mary Dillhoff, Andrei Manilchuk, Jordan Cloyd, Carl R Schmidt, Timothy M Pawlik
BACKGROUND: The objective of the current study was to define risk factors associated with the 30-day post-operative risk of VTE after HPB surgery and create a model to identify patients at highest risk of post-discharge VTE. METHODS: Patients who underwent hepatectomy or pancreatectomy in the ACS-NSQIP Participant Use Files 2011-2015 were identified. Logistic regression modeling was used; a model to predict post-discharge VTE was developed. Model discrimination was tested using area under the curve (AUC)...
February 19, 2018: HPB: the Official Journal of the International Hepato Pancreato Biliary Association
Cesar Garriga, Maria T Sanchez-Santos, Andrew Judge, Thomas Perneger, Didier Hannouche, Anne Lübbeke, Nigel K Arden
We aimed to develop a predictive model for non-satisfaction following primary total knee replacement (TKR) and to assess its transportability to another health care system. Data for model development were obtained from two UK tertiary hospitals. Model transportation data were collected from Geneva University Hospitals in Switzerland. Participants were individuals undergoing primary TKR with non-satisfaction with surgery after one year the outcome of interest. Multiple imputation and logistic regression modelling with bootstrap backward selection were used to identify predictors of outcome...
February 21, 2018: Scientific Reports
Frances Chandler, Joyce Kane, Amanda Blackford, Margaux Weinberger, Kavitha Wagner, Ivana Gojo, Melanie Cohen, Colleen Apostol
OBJECTIVES: To identify predictive signs and symptoms occurring in hospitalized adults with hematologic malignancies with intracranial hemorrhage (IH).
. SAMPLE & SETTING: In a National Cancer Institute (NCI)-designated comprehensive cancer center, a retrospective matched case-control design included adult inpatients with hematologic malignancies with (n = 39) and without (n = 39) IH.
. METHODS & VARIABLES: Conditional logistic regression, t test, and Fisher's exact tests were used to assess increased risks for IH and the development of a prognostic nomogram with signs, symptoms, and laboratory values relevant to IH...
March 1, 2018: Oncology Nursing Forum
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