keyword
MENU ▼
Read by QxMD icon Read
search

Ioannidis

keyword
https://www.readbyqxmd.com/read/28445470/the-credibility-crisis-in-research-can-economics-tools-help
#1
Thomas Gall, John P A Ioannidis, Zacharias Maniadis
The issue of nonreplicable evidence has attracted considerable attention across biomedical and other sciences. This concern is accompanied by an increasing interest in reforming research incentives and practices. How to optimally perform these reforms is a scientific problem in itself, and economics has several scientific methods that can help evaluate research reforms. Here, we review these methods and show their potential. Prominent among them are mathematical modeling and laboratory experiments that constitute affordable ways to approximate the effects of policies with wide-ranging implications...
April 2017: PLoS Biology
https://www.readbyqxmd.com/read/28435099/a-meta-analysis-but-not-a-systematic-review-an-evaluation-of-the-global-bmi-mortality-collaboration
#2
Katherine M Flegal, John P A Ioannidis
Meta-analyses of individual participant data (MIPDs) offer many advantages and are considered the highest level of evidence. However, MIPDs can be seriously compromised when they are not solidly founded upon a systematic review. These data-intensive collaborative projects may be led by experts who already have deep knowledge of the literature in the field and of the results of published studies and how these results vary based on different analytical approaches. If investigators tailor the searches, eligibility criteria and analysis plan of the MIPD, they run the risk of reaching foregone conclusions...
April 20, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28419203/selective-cutoff-reporting-in-studies-of-diagnostic-test-accuracy-a-comparison-of-conventional-and-individual-patient-data-meta-analyses-of-the-patient-health-questionnaire-9-depression-screening-tool
#3
Brooke Levis, Andrea Benedetti, Alexander W Levis, John P A Ioannidis, Ian Shrier, Pim Cuijpers, Simon Gilbody, Lorie A Kloda, Dean McMillan, Scott B Patten, Russell J Steele, Roy C Ziegelstein, Charles H Bombardier, Flavia de Lima Osório, Jesse R Fann, Dwenda Gjerdingen, Femke Lamers, Manote Lotrakul, Sonia R Loureiro, Bernd Löwe, Juwita Shaaban, Lesley Stafford, Henk C P M van Weert, Mary A Whooley, Linda S Williams, Karin A Wittkampf, Albert S Yeung, Brett D Thombs
In studies of diagnostic test accuracy, authors sometimes report results only for a range of cutoff points around data-driven "optimal" cutoffs. We assessed selective cutoff reporting in studies of the diagnostic accuracy of the Patient Health Questionnaire-9 (PHQ-9) depression screening tool. We compared conventional meta-analysis of published results only with individual-patient-data meta-analysis of results derived from all cutoff points, using data from 13 of 16 studies published during 2004-2009 that were included in a published conventional meta-analysis...
April 13, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28411080/a-meta-analysis-of-individual-participant-data-constructed-to-align-with-prior-expert-views-comments-on-bhupathiraju-et-al
#4
Katherine M Flegal, John P A Ioannidis
No abstract text is available yet for this article.
April 11, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28407061/lifetime-abuse-and-perceived-social-support-among-the-elderly-a-study-from-seven-european-countries
#5
Bahareh Eslami, Mirko Di Rosa, Henrique Barros, Mindaugas Stankunas, Francisco Torres-Gonzalez, Elisabeth Ioannidi-Kapolou, Jutta Lindert, Maria Gabriella Melchiorre
Being a victim of abuse during one's life course may affect social relations in later life. The aims of this study were to: (i) examine the association between lifetime abuse and perceived social support and (ii) identify correlates of perceived social support among older persons living in seven European countries. A sample of 4467 women and men aged 60-84 years living in Germany, Greece, Italy, Lithuania, Portugal, Spain and Sweden was collected through a cross-sectional population-based study. Abuse (psychological, physical, sexual, financial and injury) was assessed through interviews or interviews/self-response questionnaire based on the Conflict Tactics Scale-2 and the UK study on elder abuse...
April 11, 2017: European Journal of Public Health
https://www.readbyqxmd.com/read/28397612/adolescent-friendships-predict-later-resilient-functioning-across-psychosocial-domains-in-a-healthy-community-cohort
#6
A-L van Harmelen, R A Kievit, K Ioannidis, S Neufeld, P B Jones, E Bullmore, R Dolan, P Fonagy, I Goodyer
BACKGROUND: Adolescence is a key time period for the emergence of psychosocial and mental health difficulties. To promote adolescent adaptive ('resilient') psychosocial functioning (PSF), appropriate conceptualisation and quantification of such functioning and its predictors is a crucial first step. Here, we quantify resilient functioning as the degree to which an individual functions better or worse than expected given their self-reported childhood family experiences, and relate this to adolescent family and friendship support...
April 11, 2017: Psychological Medicine
https://www.readbyqxmd.com/read/28380001/changes-in-circulating-microrna-levels-can-be-identified-as-early-as-day-8-of-pregnancy-in-cattle
#7
Jason Ioannidis, F Xavier Donadeu
Poor reproductive performance remains a major issue in the dairy industry, with low conception rates having a significant impact on milk production through extended calving intervals. A major limiting factor is the lack of reliable methods for early pregnancy diagnosis. Identification of animals within a herd that fail to conceive within 3 weeks after insemination would allow early re-insemination and shorten calving intervals. In a previous study, we found an increase in plasma miR-26a levels in Day 16-pregnant relative to non-pregnant heifers, however changes in miRNA levels that early during pregnancy were very small which likely prevented the identification of robust biomarkers...
2017: PloS One
https://www.readbyqxmd.com/read/28368475/the-adequate-corpus-luteum-mir-96-promotes-luteal-cell-survival-and-progesterone-production
#8
Bushra T Mohammed, Sadanand D Sontakke, Jason Ioannidis, W Colin Duncan, F Xavier Donadeu
Context: Inadequate progesterone production from the corpus luteum is associated with pregnancy loss. Data available in model species suggest important roles of miRNAs in luteal development and maintenance. Objective: To comprehensively investigate the involvement of miRNAs during the ovarian follicle-luteal transition. Design: The effects of specific miRNAs on survival and steroid production by human luteinized granulosa cells (hLGCs) were tested using specific miRNA inhibitors...
March 20, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28365627/corrigendum-headache-in-an-hiv-positive-patient-diagnostic-challenges-and-approach-to-treatment
#9
Andrew Creamer, Stefanos Ioannidis, Thomas Wilhelm, Tabitha Mahungu, Marc Lipman
No abstract text is available yet for this article.
April 2017: Clinical Medicine: Journal of the Royal College of Physicians of London
https://www.readbyqxmd.com/read/28358823/genome-wide-association-screens-for-achilles-tendon-and-acl-tears-and-tendinopathy
#10
Stuart K Kim, Thomas R Roos, Andrew K Roos, John P Kleimeyer, Marwa A Ahmed, Gabrielle T Goodlin, Michael Fredericson, John P A Ioannidis, Andrew L Avins, Jason L Dragoo
Achilles tendinopathy or rupture and anterior cruciate ligament (ACL) rupture are substantial injuries affecting athletes, associated with delayed recovery or inability to return to competition. To identify genetic markers that might be used to predict risk for these injuries, we performed genome-wide association screens for these injuries using data from the Genetic Epidemiology Research on Adult Health and Aging (GERA) cohort consisting of 102,979 individuals. We did not find any single nucleotide polymorphisms (SNPs) associated with either of these injuries with a p-value that was genome-wide significant (p<5x10-8)...
2017: PloS One
https://www.readbyqxmd.com/read/28357835/identification-of-world-health-organisation-ship-s-medicine-chest-contents-by-anatomical-therapeutic-chemical-atc-classification-codes
#11
Seyed Khorsow Tayebati, Giulio Nittari, Syed Sarosh Mahdi, Nicholas Ioannidis, Fabio Sibilio, Francesco Amenta
BACKGROUND: Ships should carry mandatory given amounts of medicinal products and basic first aid items, collectively known as the ship's medicine chest. Type and quantities of these products/items are suggested by the World Health Organisation (WHO) and regulated by individual flag states. In countries that lack national legislation, it is assumed that ships should follow WHO indications. An objective difficulty mainly involving vessels of international long-haul routes could be to recognise medicinal compounds obtained in other countries for replacing products used or expired...
2017: International Maritime Health
https://www.readbyqxmd.com/read/28321561/ethics-and-epistemology-in-big-data-research
#12
Wendy Lipworth, Paul H Mason, Ian Kerridge, John P A Ioannidis
Biomedical innovation and translation are increasingly emphasizing research using "big data." The hope is that big data methods will both speed up research and make its results more applicable to "real-world" patients and health services. While big data research has been embraced by scientists, politicians, industry, and the public, numerous ethical, organizational, and technical/methodological concerns have also been raised. With respect to technical and methodological concerns, there is a view that these will be resolved through sophisticated information technologies, predictive algorithms, and data analysis techniques...
March 20, 2017: Journal of Bioethical Inquiry
https://www.readbyqxmd.com/read/28320937/meta-assessment-of-bias-in-science
#13
Daniele Fanelli, Rodrigo Costas, John P A Ioannidis
Numerous biases are believed to affect the scientific literature, but their actual prevalence across disciplines is unknown. To gain a comprehensive picture of the potential imprint of bias in science, we probed for the most commonly postulated bias-related patterns and risk factors, in a large random sample of meta-analyses taken from all disciplines. The magnitude of these biases varied widely across fields and was overall relatively small. However, we consistently observed a significant risk of small, early, and highly cited studies to overestimate effects and of studies not published in peer-reviewed journals to underestimate them...
April 4, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28306144/exclusion-of-elderly-people-from-randomized-clinical-trials-of-drugs-for-ischemic-heart-disease
#14
Florence T Bourgeois, Liat Orenstein, Sarita Ballakur, Kenneth D Mandl, John P A Ioannidis
OBJECTIVES: To measure exclusion of elderly adults from randomized trials studying drug interventions for ischemic heart disease (IHD) and describe the characteristics of these trials. DESIGN: Cross-sectional analysis. SETTING: Interventional clinical trials studying a drug intervention for IHD that started in 2006 and after were identified in ClinicalTrials.gov. Data were extracted on study features, including age-based inclusion criteria...
March 17, 2017: Journal of the American Geriatrics Society
https://www.readbyqxmd.com/read/28298413/the-reproducibility-wars-successful-unsuccessful-uninterpretable-exact-conceptual-triangulated-contested-replication
#15
John P A Ioannidis
No abstract text is available yet for this article.
March 15, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28286545/erratum-to-iroa-international-register-of-open-abdomen-preliminary-results
#16
Federico Coccolini, Giulia Montori, Marco Ceresoli, Fausto Catena, Rao Ivatury, Michael Sugrue, Massimo Sartelli, Paola Fugazzola, Davide Corbella, Francesco Salvetti, Ionut Negoi, Monica Zese, Savino Occhionorelli, Stefano Maccatrozzo, Sergei Shlyapnikov, Christian Galatioto, Massimo Chiarugi, Zaza Demetrashvili, Daniele Dondossola, Yovcho Yovtchev, Orestis Ioannidis, Giuseppe Novelli, Mirco Nacoti, Desmond Khor, Kenji Inaba, Demetrios Demetriades, Torsten Kaussen, Asri Che Jusoh, Wagih Ghannam, Boris Sakakushev, Ohad Guetta, Agron Dogjani, Stefano Costa, Sandeep Singh, Dimitrios Damaskos, Arda Isik, Kuo-Ching Yuan, Francesco Trotta, Stefano Rausei, Aleix Martinez-Perez, Giovanni Bellanova, Vinicius Cordeiro Fonseca, Fernando Hernández, Athanasios Marinis, Wellington Fernandes, Martha Quiodettis, Miklosh Bala, Andras Vereczkei, Rafael L Curado, Gustavo Pereira Fraga, Bruno M Pereira, Mahir Gachabayov, Guillermo Perez Chagerben, Miguel Leon Arellano, Sefa Ozyazici, Gianluca Costa, Tugan Tezcaner, Luca Ansaloni
[This corrects the article DOI: 10.1186/s13017-017-0123-8.].
2017: World Journal of Emergency Surgery: WJES
https://www.readbyqxmd.com/read/28282605/variations-of-renal-tissue-oxygenation-during-abdominal-compartment-syndrome-and-sepsis
#17
Stavros Kalfadis, Vaia Nalbanti, Orestis Ioannidis, George Porfiriou, Dimitrios Botsios, Konstantinos Tsalis
PURPOSE: This experimental study was designed to evaluate the renal tissue oxygenation under the coexistence of abdominal compartment syndrome and sepsis. MATERIAL AND METHODS: Fourteen non-breed dogs were divided into two groups: the control group (8) and the study group (6). Sepsis was established with intravenous endotoxin infusion at 100μg/kg for over 30min. Insufflation of CO2 in the peritoneal cavity was used for the increase in intra-abdominal pressure (IAP)...
March 7, 2017: Advances in Medical Sciences
https://www.readbyqxmd.com/read/28282371/increasing-efficiency-of-preclinical-research-by-group-sequential-designs
#18
Konrad Neumann, Ulrike Grittner, Sophie K Piper, Andre Rex, Oscar Florez-Vargas, George Karystianis, Alice Schneider, Ian Wellwood, Bob Siegerink, John P A Ioannidis, Jonathan Kimmelman, Ulrich Dirnagl
Despite the potential benefits of sequential designs, studies evaluating treatments or experimental manipulations in preclinical experimental biomedicine almost exclusively use classical block designs. Our aim with this article is to bring the existing methodology of group sequential designs to the attention of researchers in the preclinical field and to clearly illustrate its potential utility. Group sequential designs can offer higher efficiency than traditional methods and are increasingly used in clinical trials...
March 2017: PLoS Biology
https://www.readbyqxmd.com/read/28273140/a-simulation-study-of-the-strength-of-evidence-in-the-recommendation-of-medications-based-on-two-trials-with-statistically-significant-results
#19
Don van Ravenzwaaij, John P A Ioannidis
A typical rule that has been used for the endorsement of new medications by the Food and Drug Administration is to have two trials, each convincing on its own, demonstrating effectiveness. "Convincing" may be subjectively interpreted, but the use of p-values and the focus on statistical significance (in particular with p < .05 being coined significant) is pervasive in clinical research. Therefore, in this paper, we calculate with simulations what it means to have exactly two trials, each with p < .05, in terms of the actual strength of evidence quantified by Bayes factors...
2017: PloS One
https://www.readbyqxmd.com/read/28270433/waste-leaks-and-failures-in-the-biomarker-pipeline
#20
REVIEW
John P A Ioannidis, Patrick M M Bossuyt
BACKGROUND: The large, expanding literature on biomarkers is characterized by almost ubiquitous significant results, with claims about the potential importance, but few of these discovered biomarkers are used in routine clinical care. CONTENT: The pipeline of biomarker development includes several specific stages: discovery, validation, clinical translation, evaluation, implementation (and, in the case of nonutility, deimplementation). Each of these stages can be plagued by problems that cause failures of the overall pipeline...
March 7, 2017: Clinical Chemistry
keyword
keyword
13715
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"