Search Results - "Walter, Stephen"

SciFinder by Gabrielson, Stephen Walter

“…SciFinder, a resource from the Chemical Abstracts Service (CAS), is a curated database of chemical and bibliographic information that covers several scientific…”
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Estimation of diagnostic test accuracy: A “Rule of Three” for data with repeated observations but without a gold standard by Walter, Stephen D.

“…This article considers how to estimate the accuracy of a diagnostic test when there are repeated observations, but without the availability of a gold standard…”
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A method was developed for correcting the bias in the usual study weights in meta-analyses: author’s reply by Walter, Stephen D., Balakrishnan, Narayanaswamy, Song, Ge

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The fragility of trial results involves more than statistical significance alone by Walter, Stephen D., Thabane, Lehana, Briel, Matthias

“…The fragility of clinical trial findings has been previously defined as the number of changes in outcomes that are required to change their statistical…”
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Reply to Cochrane Statistical Methods Group by Walter, Stephen D, Balakrishnan, Narayanaswamy, Song, Ge

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Shifting the focus away from binary thinking of statistical significance and towards education for key stakeholders: revisiting the debate on whether it's time to de-emphasize or get rid of statistical significance by Li, Guowei, Walter, Stephen D, Thabane, Lehana

“…•The debate regarding the appropriate use of P-values and statistical significance in clinical research has resurfaced through recent calls to modify the…”
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A method was developed for correcting the bias in the usual study weights in meta-analyses by Walter, Stephen D., Balakrishnan, Narayanaswamy

“…Our goal was to evaluate the bias in the usual method of estimating study weights in a meta-analysis and to develop a suitable bias correction. In…”
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Correction to Walter SD, Turner RM, Macaskill P. Optimising the two‐stage randomised trial design when some participants are indifferent in their treatment preferences (2019). Statistics in Medicine 38, 2317‐2331 by Walter, Stephen D.

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Vitamin D deficiency and depression in adults: systematic review and meta-analysis by Anglin, Rebecca E. S., Samaan, Zainab, Walter, Stephen D., McDonald, Sarah D.

“…There is conflicting evidence about the relationship between vitamin D deficiency and depression, and a systematic assessment of the literature has not been…”
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GRADE approach to rate the certainty from a network meta-analysis: avoiding spurious judgments of imprecision in sparse networks by Brignardello-Petersen, Romina, Murad, M. Hassan, Walter, Stephen D., McLeod, Shelley, Carrasco-Labra, Alonso, Rochwerg, Bram, Schünemann, Holger J., Tomlinson, George, Guyatt, Gordon H.

“…When direct and indirect estimates of treatment effects are coherent, network meta-analysis (NMA) estimates should have increased precision (narrower…”
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Total Hip Arthroplasty or Hemiarthroplasty for Hip Fracture by Bhandari, Mohit, Einhorn, Thomas A, Guyatt, Gordon, Schemitsch, Emil H, Zura, Robert D, Sprague, Sheila, Frihagen, Frede, Guerra-Farfán, Ernesto, Kleinlugtenbelt, Ydo V, Poolman, Rudolf W, Rangan, Amar, Bzovsky, Sofia, Heels-Ansdell, Diane, Thabane, Lehana, Walter, Stephen D, Devereaux, P J

“…Patients who were 50 years of age or older and had a displaced femoral neck fracture were randomly assigned to total hip arthroplasty or hemiarthroplasty…”
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High-Frequency Oscillation in Early Acute Respiratory Distress Syndrome by Ferguson, Niall D, Cook, Deborah J, Guyatt, Gordon H, Mehta, Sangeeta, Hand, Lori, Austin, Peggy, Zhou, Qi, Matte, Andrea, Walter, Stephen D, Lamontagne, Francois, Granton, John T, Arabi, Yaseen M, Arroliga, Alejandro C, Stewart, Thomas E, Slutsky, Arthur S, Meade, Maureen O

“…In this trial, high-frequency oscillatory ventilation was compared with conventional ventilation with a lung-protective protocol. When the study was stopped…”
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The statistical significance of randomized controlled trial results is frequently fragile: a case for a Fragility Index by Walsh, Michael, Srinathan, Sadeesh K, McAuley, Daniel F, Mrkobrada, Marko, Levine, Oren, Ribic, Christine, Molnar, Amber O, Dattani, Neil D, Burke, Andrew, Guyatt, Gordon, Thabane, Lehana, Walter, Stephen D, Pogue, Janice, Devereaux, P.J

“…Abstract Objectives A P -value <0.05 is one metric used to evaluate the results of a randomized controlled trial (RCT). We wondered how often statistically…”
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Estimation of standard deviations and inverse‐variance weights from an observed range by Walter, Stephen D., Rychtář, Jan, Taylor, Dewey, Balakrishnan, Narayanaswamy

“…A variety of methods have been proposed to estimate a standard deviation, when only a sample range has been observed or reported. This problem occurs in the…”
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Design and analysis of factorial clinical trials: The impact of one treatment's effectiveness on the statistical power and required sample size of the other by Walter, Stephen D., Belo, Ian J.

“…Factorial allow for the simultaneous evaluation of more than one treatment, by randomizing patients to their possible combinations, including control. However,…”
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Randomized Trial of Reamed and Unreamed Intramedullary Nailing of Tibial Shaft Fractures by Bhandari, Mohit, Guyatt, Gordon, Tornetta, 3rd, Paul, Schemitsch, Emil H, Swiontkowski, Marc, Sanders, David, Walter, Stephen D

“…BackgroundThere remains a compelling biological rationale for both reamed and unreamed intramedullary nailing for the treatment of tibial shaft fractures…”
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GRADE guidelines: 13. Preparing Summary of Findings tables and evidence profiles—continuous outcomes by Guyatt, Gordon H, Thorlund, Kristian, Oxman, Andrew D, Walter, Stephen D, Patrick, Donald, Furukawa, Toshi A, Johnston, Bradley C, Karanicolas, Paul, Akl, Elie A, Vist, Gunn, Kunz, Regina, Brozek, Jan, Kupper, Lawrence L, Martin, Sandra L, Meerpohl, Joerg J, Alonso-Coello, Pablo, Christensen, Robin, Schunemann, Holger J

“…Abstract Presenting continuous outcomes in Summary of Findings tables presents particular challenges to interpretation. When each study uses the same outcome…”
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Inconsistent definitions for intention-to-treat in relation to missing outcome data: systematic review of the methods literature by Alshurafa, Mohamad, Briel, Matthias, Akl, Elie A, Haines, Ted, Moayyedi, Paul, Gentles, Stephen J, Rios, Lorena, Tran, Chau, Bhatnagar, Neera, Lamontagne, Francois, Walter, Stephen D, Guyatt, Gordon H

“…Authors of randomized trial reports seem to hold a variety of views regarding the relationship between missing outcome data (MOD) and intention to treat (ITT)…”
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Effects of health literacy, screening, and participant choice on action plans for reducing unhealthy snacking in Australia: A randomised controlled trial by Ayre, Julie, Cvejic, Erin, Bonner, Carissa, Turner, Robin M, Walter, Stephen D, McCaffery, Kirsten J

“…Low health literacy is associated with poorer health outcomes. A key strategy to address health literacy is a universal precautions approach, which recommends…”
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Higher vs Lower Positive End-Expiratory Pressure in Patients With Acute Lung Injury and Acute Respiratory Distress Syndrome: Systematic Review and Meta-analysis by Briel, Matthias, Meade, Maureen, Mercat, Alain, Brower, Roy G, Talmor, Daniel, Walter, Stephen D, Slutsky, Arthur S, Pullenayegum, Eleanor, Zhou, Qi, Cook, Deborah, Brochard, Laurent, Richard, Jean-Christophe M, Lamontagne, Francois, Bhatnagar, Neera, Stewart, Thomas E, Guyatt, Gordon

“…CONTEXT Trials comparing higher vs lower levels of positive end-expiratory pressure (PEEP) in adults with acute lung injury or acute respiratory distress…”
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