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Statistics and Nephrology

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256 papers 100 to 500 followers
By Isabel Acosta-Ochoa Nephrology senior staff. Valladolid. Spain
https://www.readbyqxmd.com/read/28751576/analytic-considerations-for-repeated-measures-of-egfr-in-cohort-studies-of-ckd
#1
Haochang Shou, Jesse Y Hsu, Dawei Xie, Wei Yang, Jason Roy, Amanda H Anderson, J Richard Landis, Harold I Feldman, Afshin Parsa, Christopher Jepson
Repeated measures of various biomarkers provide opportunities for us to enhance understanding of many important clinical aspects of CKD, including patterns of disease progression, rates of kidney function decline under different risk factors, and the degree of heterogeneity in disease manifestations across patients. However, because of unique features, such as correlations across visits and time dependency, these data must be appropriately handled using longitudinal data analysis methods. We provide a general overview of the characteristics of data collected in cohort studies and compare appropriate statistical methods for the analysis of longitudinal exposures and outcomes...
July 27, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/28754551/the-fragility-of-significant-results-underscores-the-need-of-larger-randomized-controlled-trials-in-nephrology
#2
Lani R Shochet, Peter G Kerr, Kevan R Polkinghorne
The Fragility Index is a tool for testing robustness of randomized controlled trial results for dichotomous outcomes. It describes the minimum number of individuals in whom changing an event status would render a statistically significant result nonsignificant. Here we identified all randomized controlled trials in five nephrology and five general journals from 2005-2014. A total of 127 randomized controlled trials reporting at least one dichotomous statistically significant outcome (p less than 0.05) were included and the Fragility Index was calculated...
July 26, 2017: Kidney International
https://www.readbyqxmd.com/read/28738403/developing-consensus-based-priority-outcome-domains-for-trials-in-kidney-transplantation-a-multinational-delphi-survey-with-patients-caregivers-and-health-professionals
#3
Bénédicte Sautenet, Allison Tong, Karine E Manera, Jeremy R Chapman, Anthony N Warrens, David Rosenbloom, Germaine Wong, John Gill, Klemens Budde, Lionel Rostaing, Lorna Marson, Michelle A Josephson, Peter P Reese, Timothy L Pruett, Camilla S Hanson, Donal O'Donoghue, Helen Tam-Tham, Jean-Michel Halimi, Jenny I Shen, John Kanellis, John D Scandling, Kirsten Howard, Martin Howell, Nick Cross, Nicole Evangelidis, Philip Masson, Rainer Oberbauer, Samuel Fung, Shilpa Jesudason, Simon Knight, Sreedhar Mandayam, Stephen P McDonald, Steve Chadban, Tasleem Rajan, Jonathan C Craig
BACKGROUND: Inconsistencies in outcome reporting and frequent omission of patient-centered outcomes can diminish the value of trials in treatment decision making. We identified critically important outcome domains in kidney transplantation based on the shared priorities of patients/caregivers and health professionals. METHODS: In a 3-round Delphi survey, patients/caregivers and health professionals rated the importance of outcome domains for trials in kidney transplantation on a 9-point Likert scale and provided comments...
August 2017: Transplantation
https://www.readbyqxmd.com/read/28729382/recommended-clinical-trial-end-points-for-dialysis-catheters
#4
Michael Allon, Deborah J Brouwer-Maier, Kenneth Abreo, Kevin M Baskin, Kay Bregel, Deepa H Chand, Andrea M Easom, Leonard Mermel, Michele H Mokrzycki, Priti R Patel, Prabir Roy-Chaudhury, Surendra Shenoy, Rudolph P Valentini, Haimanot Wasse
Central venous catheters are used frequently in patients on hemodialysis as a bridge to a permanent vascular access. They are prone to frequent complications, including catheter-related bloodstream infection, catheter dysfunction, and central vein obstruction. There is a compelling need to develop new drugs or devices to prevent central venous catheter complications. We convened a multidisciplinary panel of experts to propose standardized definitions of catheter end points to guide the design of future clinical trials seeking approval from the Food and Drug Administration...
July 20, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/28729383/definitions-and-end-points-for-interventional-studies-for-arteriovenous-dialysis-access
#5
Gerald A Beathard, Charmaine E Lok, Marc H Glickman, Ahmed A Al-Jaishi, Donna Bednarski, David L Cull, Jeffery H Lawson, Timmy C Lee, Vandana D Niyyar, Donna Syracuse, Scott O Trerotola, Prabir Roy-Chaudhury, Surendra Shenoy, Margo Underwood, Haimanot Wasse, Karen Woo, Theodore H Yuo, Thomas S Huber
This paper is part of the Clinical Trial Endpoints for Dialysis Vascular Access Project of the American Society of Nephrology Kidney Health Initiative. The purpose of this project is to promote research in vascular access by clarifying trial end points which would be best suited to inform decisions in those situations in which supportive clinical data are required. The focus of a portion of the project is directed toward arteriovenous access. There is a potential for interventional studies to be directed toward any of the events that may be associated with an arteriovenous access' evolution throughout its life cycle, which has been divided into five distinct phases...
July 20, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/28727250/lack-of-adjustment-for-confounding-could-lead-to-misleading-conclusions
#6
EDITORIAL
S Christakoudi, M P Hernandez-Fuentes
In a recent issue Asare et al. (1) assess the utility of a previously identified signature of tolerance, based on the expression of two B-cell receptor genes (IGKV1D-13 and IGKV4-1). The authors set to determine the prevalence of "tolerance" predictions in treated stable kidney transplant recipients (KTRs) and "tolerance" frequency in patients with different immunosuppressant (IS) regimens. They illustrate (Figure 6), very successfully, that changes in the signature are compatible with known alterations of the B-cell compartment elicited by IS drugs...
July 20, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28716856/statistical-methods-for-recurrent-event-analysis-in-cohort-studies-of-ckd
#7
Wei Yang, Christopher Jepson, Dawei Xie, Jason A Roy, Haochang Shou, Jesse Yenchih Hsu, Amanda Hyre Anderson, J Richard Landis, Jiang He, Harold I Feldman
Cardiovascular events, such as hospitalizations because of congestive heart failure, often occur repeatedly in patients with CKD. Many studies focus on analyses of the first occurrence of these events, and discard subsequent information. In this article, we review a number of statistical methods for analyzing ordered recurrent events of the same type, including Poisson regression and three commonly used survival models that are extensions of Cox proportional hazards regression. We illustrate the models by analyzing data from the Chronic Renal Insufficiency Cohort Study to identify risk factors for congestive heart failure hospitalizations in patients with CKD...
July 17, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/28707701/variable-selection-for-joint-models-of-multivariate-longitudinal-measurements-and-event-time-data
#8
Yuqi Chen, Yuedong Wang
Joint modeling of longitudinal and survival data has attracted a great deal of attention. Some research has been undertaken to extend the joint model to incorporate multivariate longitudinal measurements recently. However, there is a lack of variable selection methods in the joint modeling of multivariate longitudinal measurements and survival time. In this article, we develop penalized likelihood methods for the selection of longitudinal features in the survival submodel. A multivariate linear mixed effect model is used to model multiple longitudinal processes where random intercepts and slopes serve as essential features of the trajectories...
July 14, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/28656892/clinical-trials-during-epidemics
#9
Gerald T Keusch, Keith P W J McAdam
No abstract text is available yet for this article.
June 24, 2017: Lancet
https://www.readbyqxmd.com/read/28586895/data-sharing-statements-for-clinical-trials-a-requirement-of-the-international-committee-of-medical-journal-editors
#10
EDITORIAL
Darren B Taichman, Peush Sahni, Anja Pinborg, Larry Peiperl, Christine Laine, Astrid James, Sung-Tae Hong, Abraham Haileamlak, Laragh Gollogly, Fiona Godlee, Frank A Frizelle, Fernando Florenzano, Jeffrey M Drazen, Howard Bauchner, Christopher Baethge, Joyce Backus
No abstract text is available yet for this article.
June 27, 2017: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/28586883/adjustment-strategies-in-studies-of-therapy
#11
LETTER
Igor Karp
No abstract text is available yet for this article.
June 6, 2017: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/28633144/standardized-renal-endpoints-for-perioperative-clinical-trials-the-standardized-endpoints-in-perioperative-medicine-initiative
#12
David R McIlroy, Andrew D Shaw, Paul S Myles
Perioperative acute kidney injury is a common problem. While clinical trials seek to evaluate the impact of interventions on a variety of primary and secondary endpoints with the aim of implementing this knowledge to improve perioperative outcomes, the use of valid and relevant endpoints within clinical trials is of critical importance to achieving this goal. Suitable endpoints must be validated for the study population and in light of the clinical context under investigation while also considering regulatory requirements that govern the licensing of new therapeutic agents as well as the values of patients whose outcomes we seek to improve...
June 21, 2017: Nephron
https://www.readbyqxmd.com/read/28586802/when-to-adjust-for-potentially-confounding-variables
#13
Johannes M Lehner
No abstract text is available yet for this article.
June 1, 2017: JAMA Internal Medicine
https://www.readbyqxmd.com/read/28605802/computer-aided-systematic-review-screening-comes-of-age
#14
Brian J Hemens, Alfonso Iorio
No abstract text is available yet for this article.
June 13, 2017: Annals of Internal Medicine
https://www.readbyqxmd.com/read/28594153/data-sharing-models
#15
LETTER
John G Sotos, Yentram Huyen, Alice Borrelli
No abstract text is available yet for this article.
June 8, 2017: New England Journal of Medicine
https://www.readbyqxmd.com/read/28591539/data-sharing-models
#16
LETTER
Monica M Bertagnoll, Sean Khozin, Martin J Murphy
New England Journal of Medicine, Volume 376, Issue 23, Page 2305-2306, June 2017.
June 8, 2017: New England Journal of Medicine
https://www.readbyqxmd.com/read/28583149/effect-sizes-in-ongoing-randomized-controlled-critical-care-trials
#17
Elliott E Ridgeon, Rinaldo Bellomo, Scott K Aberegg, Rob Mac Sweeney, Rachel S Varughese, Giovanni Landoni, Paul J Young
BACKGROUND: An important limitation of many critical care trial designs is that they hypothesize large, and potentially implausible, reductions in mortality. Interpretation of trial results could be improved by systematic assessment of the plausibility of trial hypotheses; however, such assessment has not been attempted in the field of critical care medicine. The purpose of this study was to determine clinicians' views about prior probabilities and plausible effect sizes for ongoing critical care trials where the primary endpoint is landmark mortality...
June 5, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/28581902/data-sharing-statements-for-clinical-trials-a-requirement-of-the-international-committee-of-medical-journal-editors
#18
EDITORIAL
Darren B Taichman, Peush Sahni, Anja Pinborg, Larry Peiperl, Christine Laine, Astrid James, Sung-Tae Hong, Abraham Haileamlak, Laragh Gollogly, Fiona Godlee, Frank A Frizelle, Fernando Florenzano, Jeffrey M Drazen, Howard Bauchner, Christopher Baethge, Joyce Backus
New England Journal of Medicine, Volume 376, Issue 23, Page 2277-2279, June 2017.
June 8, 2017: New England Journal of Medicine
https://www.readbyqxmd.com/read/28535904/evidence-and-renovascular-disease-trials-and-mistrials
#19
EDITORIAL
Stephen C Textor, Sandra M Herrmann
No abstract text is available yet for this article.
May 20, 2017: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/28531908/methods-and-reporting-studies-assessing-fecal-microbiota-transplantation-a-systematic-review
#20
REVIEW
Aïda Bafeta, Amelie Yavchitz, Carolina Riveros, Rui Batista, Philippe Ravaud
Background: Fecal microbiota transplantation (FMT) could be a novel treatment option for several chronic diseases associated with altered gut microbiota. Purpose: To examine the conduct and reporting of studies assessing FMT. Data Sources: Cochrane Central Register of Controlled Trials, PubMed, EMBASE, and Web of Science from inception to 31 January 2017. Study Selection: Two reviewers independently examined titles and abstracts to identify all English-language reports of human clinical studies assessing the safety or efficacy of FMT...
July 4, 2017: Annals of Internal Medicine
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