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Douglas Altman

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https://www.readbyqxmd.com/read/29337092/germline-brca-mutation-and-outcome-in-young-onset-breast-cancer-posh-a-prospective-cohort-study
#1
Ellen R Copson, Tom C Maishman, Will J Tapper, Ramsey I Cutress, Stephanie Greville-Heygate, Douglas G Altman, Bryony Eccles, Sue Gerty, Lorraine T Durcan, Louise Jones, D Gareth Evans, Alastair M Thompson, Paul Pharoah, Douglas F Easton, Alison M Dunning, Andrew Hanby, Sunil Lakhani, Ros Eeles, Fiona J Gilbert, Hisham Hamed, Shirley Hodgson, Peter Simmonds, Louise Stanton, Diana M Eccles
BACKGROUND: Retrospective studies provide conflicting interpretations of the effect of inherited genetic factors on the prognosis of patients with breast cancer. The primary aim of this study was to determine the effect of a germline BRCA1 or BRCA2 mutation on breast cancer outcomes in patients with young-onset breast cancer. METHODS: We did a prospective cohort study of female patients recruited from 127 hospitals in the UK aged 40 years or younger at first diagnosis (by histological confirmation) of invasive breast cancer...
January 11, 2018: Lancet Oncology
https://www.readbyqxmd.com/read/29325598/influence-of-peer-review-on-the-reporting-of-primary-outcome-s-and-statistical-analyses-of-randomised-trials
#2
Sally Hopewell, Claudia M Witt, Klaus Linde, Katja Icke, Olubusola Adedire, Shona Kirtley, Douglas G Altman
BACKGROUND: Selective reporting of outcomes in clinical trials is a serious problem. We aimed to investigate the influence of the peer review process within biomedical journals on reporting of primary outcome(s) and statistical analyses within reports of randomised trials. METHODS: Each month, PubMed (May 2014 to April 2015) was searched to identify primary reports of randomised trials published in six high-impact general and 12 high-impact specialty journals. The corresponding author of each trial was invited to complete an online survey asking authors about changes made to their manuscript as part of the peer review process...
January 11, 2018: Trials
https://www.readbyqxmd.com/read/29273309/the-satisfactory-growth-and-development-at-2-years-of-age-of-the%C3%A2-intergrowth-21st-fetal-growth-standards-cohort-support-its%C3%A2-appropriateness-for-constructing-international-standards
#3
José Villar, Leila Cheikh Ismail, Eleonora Staines Urias, Francesca Giuliani, Eric O Ohuma, Cesar G Victora, Aris T Papageorghiou, Douglas G Altman, Cutberto Garza, Fernando C Barros, Fabien Puglia, Roseline Ochieng, Yasmin A Jaffer, Julia A Noble, Enrico Bertino, Manorama Purwar, Ruyan Pang, Ann Lambert, Cameron Chumlea, Alan Stein, Michelle Fernandes, Zulfiqar A Bhutta, Stephen H Kennedy
BACKGROUND: The World Health Organization recommends that human growth should be monitored with the use of international standards. However, in obstetric practice, we continue to monitor fetal growth using numerous local charts or equations that are based on different populations for each body structure. Consistent with World Health Organization recommendations, the INTERGROWTH-21st Project has produced the first set of international standards to date pregnancies; to monitor fetal growth, estimated fetal weight, Doppler measures, and brain structures; to measure uterine growth, maternal nutrition, newborn infant size, and body composition; and to assess the postnatal growth of preterm babies...
December 19, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29260229/guidelines-for-the-content-of-statistical-analysis-plans-in-clinical-trials
#4
Carrol Gamble, Ashma Krishan, Deborah Stocken, Steff Lewis, Edmund Juszczak, Caroline Doré, Paula R Williamson, Douglas G Altman, Alan Montgomery, Pilar Lim, Jesse Berlin, Stephen Senn, Simon Day, Yolanda Barbachano, Elizabeth Loder
Importance: While guidance on statistical principles for clinical trials exists, there is an absence of guidance covering the required content of statistical analysis plans (SAPs) to support transparency and reproducibility. Objective: To develop recommendations for a minimum set of items that should be addressed in SAPs for clinical trials, developed with input from statisticians, previous guideline authors, journal editors, regulators, and funders. Design: Funders and regulators (n = 39) of randomized trials were contacted and the literature was searched to identify existing guidance; a survey of current practice was conducted across the network of UK Clinical Research Collaboration-registered trial units (n = 46, 1 unit had 2 responders) and a Delphi survey (n = 73 invited participants) was conducted to establish consensus on SAPs...
December 19, 2017: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/29233242/preflight-in-flight-and-postflight-imaging-of-the-cervical-and-lumbar-spine-in-astronauts
#5
Michael F Harrison, Kathleen M Garcia, Ashot E Sargsyan, Douglas Ebert, Roy F Riascos-Castaneda, Scott A Dulchavsky
BACKGROUND: Back pain is a common complaint during spaceflight that is commonly attributed to intervertebral disc swelling in microgravity. Ultrasound (US) represents the only imaging modality on the International Space Station (ISS) to assess its etiology. The present study investigated: 1) The agreement and correlation of spinal US assessments as compared to results of pre- and postflight MRI studies; and 2) the trend in intervertebral disc characteristics over the course of spaceflight to ISS...
January 1, 2018: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/29203419/flaws-in-the-application-and-interpretation-of-statistical-analyses-in-systematic-reviews-of-therapeutic-interventions-were-common-a-cross-sectional-analysis
#6
Matthew J Page, Douglas G Altman, Joanne E McKenzie, Larissa Shamseer, Nadera Ahmadzai, Dianna Wolfe, Fatemeh Yazdi, Ferrán Catalá-López, Andrea C Tricco, David Moher
OBJECTIVES: To investigate the application and interpretation of statistical analyses in a cross-section of systematic reviews (SRs) of therapeutic interventions, without restriction by journal, clinical condition, or specialty. STUDY DESIGN AND SETTING: We evaluated a random sample of SRs assembled previously, which were indexed in MEDLINE® during February 2014, focused on a treatment or prevention question, and reported at least one meta-analysis. The reported statistical methods used in each SR were extracted from articles and online appendices by one author, with a 20% random sample extracted in duplicate...
December 1, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/29159946/extracellular-volume-with-bolus-only-technique-in-amyloidosis-patients-diagnostic-accuracy-correlation-with-other-clinical-cardiac-measures-and-ability-to-track-changes-in-amyloid-load-over-time
#7
Giulia Zumbo, Sharon V Barton, Douglas Thompson, Min Sun, Amna Abdel-Gadir, Thomas A Treibel, Daniel Knight, Ana Martinez-Naharro, Lane Thirusha, Julian D Gillmore, James C Moon, Philip N Hawkins, Marianna Fontana
BACKGROUND: Extracellular volume (ECV) by T1 mapping requires the contrast agent distribution to be at equilibrium. This can be achieved either definitively with a primed contrast infusion (infusion ECV), or sufficiently with a delay postbolus (bolus-only ECV). For large ECV, the bolus-only approach measures higher than the infusion ECV, causing some uncertainty in diseases such as amyloidosis. PURPOSE: To characterize the relationship between the bolus-only and current gold-standard infusion ECV in patients with amyloidosis...
November 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29150467/interventions-to-improve-adherence-to-reporting-guidelines-in-health-research-a-scoping-review-protocol
#8
David Blanco, Jamie J Kirkham, Douglas G Altman, David Moher, Isabelle Boutron, Erik Cobo
INTRODUCTION: There is evidence that the use of some reporting guidelines, such as the Consolidated Standards for Reporting Trials, is associated with improved completeness of reporting in health research. However, the current levels of adherence to reporting guidelines are suboptimal. Over the last few years, several actions aiming to improve compliance with reporting guidelines have been taken and proposed. We will conduct a scoping review of interventions to improve adherence to reporting guidelines in health research that have been evaluated or suggested, in order to inform future interventions...
November 16, 2017: BMJ Open
https://www.readbyqxmd.com/read/29145404/core-outcome-set-standards-for-development-the-cos-stad-recommendations
#9
Jamie J Kirkham, Katherine Davis, Douglas G Altman, Jane M Blazeby, Mike Clarke, Sean Tunis, Paula R Williamson
BACKGROUND: The use of core outcome sets (COS) ensures that researchers measure and report those outcomes that are most likely to be relevant to users of their research. Several hundred COS projects have been systematically identified to date, but there has been no formal quality assessment of these studies. The Core Outcome Set-STAndards for Development (COS-STAD) project aimed to identify minimum standards for the design of a COS study agreed upon by an international group, while other specific guidance exists for the final reporting of COS development studies (Core Outcome Set-STAndards for Reporting [COS-STAR])...
November 2017: PLoS Medicine
https://www.readbyqxmd.com/read/29113936/reproducible-research-practices-are-underused-in-systematic-reviews-of-biomedical-interventions
#10
Matthew J Page, Douglas G Altman, Larissa Shamseer, Joanne E McKenzie, Nadera Ahmadzai, Dianna Wolfe, Fatemeh Yazdi, Ferrán Catalá-López, Andrea C Tricco, David Moher
OBJECTIVES: To evaluate how often reproducible research practices, which allow others to recreate the findings of studies, given the original data, are used in systematic reviews (SRs) of biomedical research. STUDY DESIGN AND SETTING: We evaluated a random sample of SRs indexed in MEDLINE® during February 2014, which focused on a therapeutic intervention and reported at least one meta-analysis. Data on reproducible research practices in each SR were extracted using a 26-item form by one author, with a 20% random sample extracted in duplicate...
November 4, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/29096787/structural-and-functional-phenotyping-of-the-failing-heart-is-the-left-ventricular-ejection-fraction-obsolete
#11
REVIEW
Michael R Bristow, David P Kao, Khadijah K Breathett, Natasha L Altman, John Gorcsan, Edward A Gill, Brian D Lowes, Edward M Gilbert, Robert A Quaife, Douglas L Mann
Diagnosis, prognosis, treatment, and development of new therapies for diseases or syndromes depend on a reliable means of identifying phenotypes associated with distinct predictive probabilities for these various objectives. Left ventricular ejection fraction (LVEF) provides the current basis for combined functional and structural phenotyping in heart failure by classifying patients as those with heart failure with reduced ejection fraction (HFrEF) and those with heart failure with preserved ejection fraction (HFpEF)...
November 2017: JACC. Heart Failure
https://www.readbyqxmd.com/read/29040525/beta-blockers-for-heart-failure-with-reduced-mid-range-and-preserved-ejection-fraction-an-individual-patient-level-analysis-of-double-blind-randomized-trials
#12
John G F Cleland, Karina V Bunting, Marcus D Flather, Douglas G Altman, Jane Holmes, Andrew J S Coats, Luis Manzano, John J V McMurray, Frank Ruschitzka, Dirk J van Veldhuisen, Thomas G von Lueder, Michael Böhm, Bert Andersson, John Kjekshus, Milton Packer, Alan S Rigby, Giuseppe Rosano, Hans Wedel, Åke Hjalmarson, John Wikstrand, Dipak Kotecha
Aims: Recent guidelines recommend that patients with heart failure and left ventricular ejection fraction (LVEF) 40-49% should be managed similar to LVEF ≥ 50%. We investigated the effect of beta-blockers according to LVEF in double-blind, randomized, placebo-controlled trials. Methods and results: Individual patient data meta-analysis of 11 trials, stratified by baseline LVEF and heart rhythm (Clinicaltrials.gov: NCT0083244; PROSPERO: CRD42014010012). Primary outcomes were all-cause mortality and cardiovascular death over 1...
October 10, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28830195/is-liver-perfusion-ct-reproducible-a-study-on-intra-and-interobserver-agreement-of-normal-hepatic-haemodynamic-parameters-obtained-with-two-different-software-packages
#13
COMPARATIVE STUDY
Elisa Almeida Sathler Bretas, Ulysses S Torres, Lucas Rios Torres, Daniel Bekhor, Celso Fernando Saito Filho, Douglas Jorge Racy, Lorenzo Faggioni, Giuseppe D'Ippolito
OBJECTIVE: To evaluate the agreement between the measurements of perfusion CT parameters in normal livers by using two different software packages. METHODS: This retrospective study was based on 78 liver perfusion CT examinations acquired for detecting suspected liver metastasis. Patients with any morphological or functional hepatic abnormalities were excluded. The final analysis included 37 patients (59.7 ± 14.9 y). Two readers (1 and 2) independently measured perfusion parameters using different software packages from two major manufacturers (A and B)...
October 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28817867/false-reassurance-based-on-non-significant-results
#14
Douglas G Altman
No abstract text is available yet for this article.
August 18, 2017: Clinical Endoscopy
https://www.readbyqxmd.com/read/28814563/statistics-notes-percentage-differences-symmetry-and-natural-logarithms
#15
Tim J Cole, Douglas G Altman
No abstract text is available yet for this article.
August 16, 2017: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/28814561/statistics-notes-what-is-a-percentage-difference
#16
Tim J Cole, Douglas G Altman
No abstract text is available yet for this article.
August 16, 2017: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/28783754/cardiac-arrest-risk-standardization-using-administrative-data-compared-to-registry-data
#17
COMPARATIVE STUDY
Anne V Grossestreuer, David F Gaieski, Michael W Donnino, Joshua I M Nelson, Eric L Mutter, Brendan G Carr, Benjamin S Abella, Douglas J Wiebe
BACKGROUND: Methods for comparing hospitals regarding cardiac arrest (CA) outcomes, vital for improving resuscitation performance, rely on data collected by cardiac arrest registries. However, most CA patients are treated at hospitals that do not participate in such registries. This study aimed to determine whether CA risk standardization modeling based on administrative data could perform as well as that based on registry data. METHODS AND RESULTS: Two risk standardization logistic regression models were developed using 2453 patients treated from 2000-2015 at three hospitals in an academic health system...
2017: PloS One
https://www.readbyqxmd.com/read/28756393/invited-commentary-methodological-issues-in-the-design-and-analysis-of-randomised-trials
#18
EDITORIAL
Mohammad Ali Mansournia, Douglas G Altman
No abstract text is available yet for this article.
July 29, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28729459/enhancing-the-usability-of-systematic-reviews-by-improving-the-consideration-and-description-of-interventions
#19
Tammy C Hoffmann, Andrew D Oxman, John Pa Ioannidis, David Moher, Toby J Lasserson, David I Tovey, Ken Stein, Katy Sutcliffe, Philippe Ravaud, Douglas G Altman, Rafael Perera, Paul Glasziou
No abstract text is available yet for this article.
July 20, 2017: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/28720117/systematic-review-adherence-to-methodological-or-reporting-quality
#20
Kusala Pussegoda, Lucy Turner, Chantelle Garritty, Alain Mayhew, Becky Skidmore, Adrienne Stevens, Isabelle Boutron, Rafael Sarkis-Onofre, Lise M Bjerre, Asbjørn Hróbjartsson, Douglas G Altman, David Moher
BACKGROUND: Guidelines for assessing methodological and reporting quality of systematic reviews (SRs) were developed to contribute to implementing evidence-based health care and the reduction of research waste. As SRs assessing a cohort of SRs is becoming more prevalent in the literature and with the increased uptake of SR evidence for decision-making, methodological quality and standard of reporting of SRs is of interest. The objective of this study is to evaluate SR adherence to the Quality of Reporting of Meta-analyses (QUOROM) and PRISMA reporting guidelines and the A Measurement Tool to Assess Systematic Reviews (AMSTAR) and Overview Quality Assessment Questionnaire (OQAQ) quality assessment tools as evaluated in methodological overviews...
July 19, 2017: Systematic Reviews
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