keyword
MENU ▼
Read by QxMD icon Read
search

Invalid performance

keyword
https://www.readbyqxmd.com/read/28906173/diagnosing-prosopagnosia-in-east-asian-individuals-norms-for-the-cambridge-face-memory-test-chinese
#1
Elinor McKone, Lulu Wan, Rachel Robbins, Kate Crookes, Jia Liu
The Cambridge Face Memory Test (CFMT) is widely accepted as providing a valid and reliable tool in diagnosing prosopagnosia (inability to recognize people's faces). Previously, large-sample norms have been available only for Caucasian-face versions, suitable for diagnosis in Caucasian observers. These are invalid for observers of different races due to potentially severe other-race effects. Here, we provide large-sample norms (N = 306) for East Asian observers on an Asian-face version (CFMT-Chinese). We also demonstrate methodological suitability of the CFMT-Chinese for prosopagnosia diagnosis (high internal reliability, approximately normal distribution, norm-score range sufficiently far above chance)...
September 14, 2017: Cognitive Neuropsychology
https://www.readbyqxmd.com/read/28903832/validation-of-modifications-to-the-ansr-for-listeria-method-for-improved-internal-positive-control-performance
#2
Susan Alles, Evan Meister, Edan Hosking, Eric Tovar, Rebecca Shaulis, Mark Schonfeld, Lei Zhang, Lin Li, Preetha Biswas, Mark Mozola, Robert Donofrio
A study was conducted to validate a minor reagent formulation change to the ANSR for Listeria method, Performance Tested Method(SM) 101202. This change involves increasing the master mix volume prelyophilization by 40% and addition of salmon sperm DNA (nontarget DNA) to the master mix. These changes improve the robustness of the internal positive control response and reduce the possibility of obtaining invalid results due to weak-positive control curves. When three foods (hot dogs, Mexican-style cheese, and cantaloupe) and sponge samples taken from a stainless steel surface were tested, no significant differences in performance between the ANSR and U...
September 14, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28882171/application-of-random-survival-forests-in-understanding-the-determinants-of-under-five-child-mortality-in-uganda-in-the-presence-of-covariates-that-satisfy-the-proportional-and-non-proportional-hazards-assumption
#3
Justine B Nasejje, Henry Mwambi
BACKGROUND: Uganda just like any other Sub-Saharan African country, has a high under-five child mortality rate. To inform policy on intervention strategies, sound statistical methods are required to critically identify factors strongly associated with under-five child mortality rates. The Cox proportional hazards model has been a common choice in analysing data to understand factors strongly associated with high child mortality rates taking age as the time-to-event variable. However, due to its restrictive proportional hazards (PH) assumption, some covariates of interest which do not satisfy the assumption are often excluded in the analysis to avoid mis-specifying the model...
September 7, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28882102/monte-carlo-simulation-based-estimation-for-the-minimum-mortality-temperature-in-temperature-mortality-association-study
#4
Whanhee Lee, Ho Kim, Sunghee Hwang, Antonella Zanobetti, Joel D Schwartz, Yeonseung Chung
BACKGROUND: Rich literature has reported that there exists a nonlinear association between temperature and mortality. One important feature in the temperature-mortality association is the minimum mortality temperature (MMT). The commonly used approach for estimating the MMT is to determine the MMT as the temperature at which mortality is minimized in the estimated temperature-mortality association curve. Also, an approximate bootstrap approach was proposed to calculate the standard errors and the confidence interval for the MMT...
September 7, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28874717/correcting-for-photodestruction-in-super-resolution-optical-fluctuation-imaging
#5
Yves Peeters, Wim Vandenberg, Sam Duwé, Arno Bouwens, Tomáš Lukeš, Cyril Ruckebusch, Theo Lasser, Peter Dedecker
Super-resolution optical fluctuation imaging overcomes the diffraction limit by analyzing fluctuations in the fluorophore emission. A key assumption of the imaging is that the fluorophores are independent, though this is invalidated in the presence of photodestruction. In this work, we evaluate the effect of photodestruction on SOFI imaging using theoretical considerations and computer simulations. We find that photodestruction gives rise to an additional signal that does not present an easily interpretable view of the sample structure...
September 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28861216/simultaneous-estimation-of-diet-composition-and-calibration-coefficients-with-fatty-acid-signature-data
#6
Jeffrey F Bromaghin, Suzanne M Budge, Gregory W Thiemann, Karyn D Rode
Knowledge of animal diets provides essential insights into their life history and ecology, although diet estimation is challenging and remains an active area of research. Quantitative fatty acid signature analysis (QFASA) has become a popular method of estimating diet composition, especially for marine species. A primary assumption of QFASA is that constants called calibration coefficients, which account for the differential metabolism of individual fatty acids, are known. In practice, however, calibration coefficients are not known, but rather have been estimated in feeding trials with captive animals of a limited number of model species...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28855305/field-evaluation-of-the-performance-of-alere-and-cepheid-qualitative-hiv-assays-for-paediatric-point-of-care-testing-in-a-soweto-academic-hospital-south-africa
#7
Tanya Y Murray, Gayle G Sherman, Firdose Nakwa, William B MacLeod, Nosisa Sipambo, Sithembiso Velaphi, Sergio Carmona
Point-of-care (POC) technologies for HIV diagnosis in infants have the potential to overcome logistical challenges that delay treatment initiation and prevent improvements in morbidity and mortality. This study aimed to evaluate the performance of two POC technologies against the current standard of care (SOC) laboratory-based assay in South Africa, when operated by nurses in a hospital environment. Children <18 months of age that were treatment naïve (excluding prophylaxis) and in whom an HIV PCR test was indicated, were eligible for the study...
August 30, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28854189/a-dynamic-model-for-estimating-adult-female-mortality-from-ovarian-dissection-data-for-the-tsetse-fly-glossina-pallidipes-austen-sampled-in-zimbabwe
#8
Sarah F Ackley, John W Hargrove
Human and animal trypanosomiasis, spread by tsetse flies (Glossina spp), is a major public health concern in much of sub-Saharan Africa. The basic reproduction number of vector-borne diseases, such as trypanosomiasis, is a function of vector mortality rate. Robust methods for estimating tsetse mortality are thus of interest for understanding population and disease dynamics and for optimal control. Existing methods for estimating mortality in adult tsetse, from ovarian dissection data, often use invalid assumptions of the existence of a stable age distribution, and age-invariant mortality and capture probability...
August 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28851293/precis%C3%A3-o-e-confiabilidade-de-um-teste-imuno-cromatogr%C3%A3-fico-r%C3%A3-pido-ns1-para-diagn%C3%A3-stico-denv-1-no-ponto-de-atendimento-e-no-laborat%C3%A3-rio
#9
Verónica Elizabeth Mata, Sonia Regina Lambert Passos, Yara Hahr Marques Hökerberg, Guilherme Miguéis Berardinelli, Maria Angelica Borges Dos Santos, Levy Vilas Boas Fukuoka, Anna Carolina Fontoura Seixas Rangel Maciel, Cintia Damasceno Dos Santos Rodrigues, Aline da Silva Santos, Raquel de Vasconcellos Carvalhaes de Oliveira
BACKGROUND: Rapid immunochromatographic tests (ICT) for dengue non-structural protein 1 (NS1) have shown good performance for diagnosing acute-phase dengue in serum in laboratory settings, but rarely have been assessed in whole blood and at point of care (POC). This study compare the accuracy and inter- and intra-observer reliability of the NS1 Bioeasy™ ICT in whole blood at POC versus serum in the laboratory, during a DENV-1 epidemic. METHODS: Cross-sectional study involving 144 adults spontaneously demanding care in an emergency department within 4 days of onset of acute febrile illness...
August 29, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28846743/evaluation-of-two-4th-generation-point-of-care-assays-for-the-detection-of-human-immunodeficiency-virus-infection
#10
Chrysovalantis Stafylis, Jeffrey D Klausner
BACKGROUND: Fourth generation assays detect simultaneously antibodies for HIV and the p24 antigen, identifying HIV infection earlier than previous generation tests. Previous studies have shown that the Alere Determine HIV-1/2 Combo has lower than anticipated performance in detecting antibodies for HIV and the p24 antigen. Furthermore, there are currently very few studies evaluating the performance of Standard Diagnostics BIOLINE HIV Ag/Ab Combo. OBJECTIVE: To evaluate the performance of the Alere Determine HIV-1/2 Combo and the Standard Diagnostics BIOLINE HIV Ag/Ab Combo in a panel of frozen serum samples...
2017: PloS One
https://www.readbyqxmd.com/read/28836246/-clinical-experience-of-combined-laparoscopic-endoscopic-heller-myotomy-and-modified-dor-fundoplication-for-cardiochalasia
#11
Xiaofang Qiao, Jinlong Li, Hua Xu, Xin Wan, Jiaming Zhu
OBJECTIVE: To investigate the efficacy of combined laparoscopic-endoscopic lower esophageal sphincterotomy and modified Dor fundoplication for cardiochalasia patients. METHODS: Clinical data of 11 cardiochalasia patients who underwent combined laparoscopic-endoscopic lower esophageal sphincterotomy and modified Dor fundoplication by the same medical team from January 2015 to December 2016 at The Second Hospital of Jilin University were retrospectively analyzed. The procedure was as follows: an incision was made in the anterior wall of esophagus and dissection of esophageal muscular layer was performed, then the bulged esophageal mucosa was covered by the fundus after 180 degrees fold to the right (fundoplication), finally the gastric fundus was joined to the right diaphragmatic foot by 3 to 5 knotted suture...
August 25, 2017: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/28829779/diagnostic-utility-of-a-line-probe-assay-for-multidrug-resistant-tb-in-smear-negative-pulmonary-tuberculosis
#12
Binit Kumar Singh, Surendra K Sharma, Rohini Sharma, Vishnubhatla Sreenivas, Vithal P Myneedu, Mikashmi Kohli, Dinkar Bhasin, Sanjay Sarin
OBJECTIVE: To evaluate the performance of Genotype MTBDRplus VER 2.0 in the diagnosis of Mycobacterium tuberculosis (MTB) in sputum smear-negative pulmonary TB cases. METHODS: A total of 572 Ziehl-Neelsen sputum smear-negative samples were selected and subjected to line probe assay (Genotype MTBDRplus VER 2.0), and culture in mycobacterial growth indicator tube (MGIT-960). Immunochromatographic test was used to confirm the MTB-complex (MTBC) in culture-positive samples and phenotypic drug-susceptibility testing was done using MGIT-960...
2017: PloS One
https://www.readbyqxmd.com/read/28826306/performance-on-the-test-of-memory-malingering-is-predicted-by-the-number-of-errors-on-its-first-10-items-on-an-inpatient-epilepsy-monitoring-unit
#13
Jonathan M Grabyan, Robert L Collins, W Alexander Alverson, David K Chen
OBJECTIVE: Performance validity testing is an increasingly vital component of neuropsychological evaluation, though administration of stand-alone performance validity tests (PVTs) can be time-consuming. As the Test of Memory Malingering (TOMM) is among the most commonly used and researched PVTs, much work has focused on creating abbreviated versions while preserving diagnostic accuracy. A recent addition to this effort, errors on the first 10 items of Trial 1 (TOMMe10), was analyzed for its utility in predicting TOMM performance...
August 22, 2017: Clinical Neuropsychologist
https://www.readbyqxmd.com/read/28819735/-evaluation-of-the-onsite-malaria-rapid-test-performance-in-miandrivazo-madagascar
#14
E Ravaoarisoa, T Andriamiandranoro, R Raherinjafy, M Jahevitra, S Razanatsiorimalala, V Andrianaranjaka, M Randrianarivelojosia
The performance of the malaria rapid diagnostic test OnSite-for detecting pan specific pLDH and Plasmodium falciparum specific HRP2 - was assessed during the malaria transmission peak period in Miandrivazo, in the southwestern part of Madagascar from April 20 to May 6, 2010. At the laboratory, the quality control OnSite Malaria Rapid Test according to the WHO/TDR/FIND method demonstrated that the test had good sensitivity. Of the 218 OnSite tests performed at the Miandrivazo Primary Health Center on patients with fever or a recent history of fever, four (1...
August 17, 2017: Bulletin de la Société de Pathologie Exotique
https://www.readbyqxmd.com/read/28818424/interlaboratory-study-for-the-establishment-of-brazilian-bothrops-reference-venom-and-antivenom-for-potency-evaluation-of-bothrops-antivenom
#15
Humberto Pinheiro de Araújo, Elizabeth Porto Reis Lucas, Wlamir Corrêa de Moura, Celia de Fátima Barbosa, Raquel Joane Rodrigues, Josefina Farina Morais, Joseana Zaja Almada, Barbara Carino Guimarães, Antonio Eugenio Castro Cardoso de Almeida, Maria Aparecida Affonso Boller
A collaborative study was performed for the establishment of the 5th lot of Brazilian Bothrops Reference Venom and the 1st lot of Brazilian Bothrops Reference Antivenom. All Brazilian manufacturers of Antibothrops Immunoglobulins and the National Control Laboratory participated of the study. The declared potency of the 5th lot of the Bothrops Reference Venom is 40.29 μg/0.5 ml, and the potency of the 1st lot of Bothrops Reference Antivenom is 6.51 mg/ml. For the potency evaluation of Bothrops Reference Venom the inter assay precision (gCV) was 3...
September 2017: Biologicals: Journal of the International Association of Biological Standardization
https://www.readbyqxmd.com/read/28818260/transcranial-doppler-monitoring-for-microemboli-a-marker-of-a-high-risk-carotid-plaque
#16
REVIEW
J David Spence
In the United States, 90% of carotid intervention is being performed for asymptomatic carotid stenosis, even though 90% of patients would be better treated with intensive medical therapy. This is being justified by comparing risks of stroke or death with medical therapy during clinical trials completed decades ago (approximately 2% per year) with risks of intervention with carotid artery stenting (CAS) versus carotid endarterectomy in recent trials that did not have a medical arm. Such extrapolations are, simply put, invalid...
March 2017: Seminars in Vascular Surgery
https://www.readbyqxmd.com/read/28817643/peripheral-clinic-versus-centralized-laboratory-based-xpert-mtb-rif-performance-experience-gained-from-a-pragmatic-stepped-wedge-trial-in-botswana
#17
Tefera Agizew, Rosanna Boyd, Ndwapi Ndwapi, Andrew Auld, Joyce Basotli, Sambayawo Nyirenda, Zegabriel Tedla, Anikie Mathoma, Unami Mathebula, Chawangwa Lesedi, Sherri Pals, Anand Date, Heather Alexander, Thomas Kuebrich, Alyssa Finlay
BACKGROUND: In 2011, the Botswana National Tuberculosis Program adopted World Health Organization guidelines and introduced Xpert MTB/RIF (Xpert) assay to support intensified case finding among people living with HIV enrolling in care. An evaluation was designed to assess performance under operational conditions to inform the national Xpert scale-up. METHODS: Xpert was implemented from August 2012 through November 2014 with 13 GeneXpert instruments (GeneXpert) deployed in a phased approach over nine months: nine centralized laboratory and four point-of-care (POC) peripheral clinics...
2017: PloS One
https://www.readbyqxmd.com/read/28816482/same-location-costs-in-peripheral-cueing-the-role-of-cue-awareness-and-feature-changes
#18
Tobias Schoeberl, Thomas Ditye, Ulrich Ansorge
Prior studies using the peripheral cueing paradigm have shown that singleton cues that do not match to the top-down search settings of the observer can impair performance in visual search when the cue appears at the target location (in valid conditions) compared with when the cue appears at a location away from the target (in invalid conditions). This pattern, the same-location cost (SLC), has recently been suggested to originate from an awareness-dependent updating of object files in working memory. It has also been argued that the processes underlying the SLC could have obscured results of prior studies by masking attentional capture effects by peripheral cues under certain conditions...
August 17, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28797447/evaluation-of-the-xpert%C3%A2-hpv-assay-in-the-detection-of-human-papillomavirus-in-formalin-fixed-paraffin-embedded-oropharyngeal-carcinomas
#19
Maria Gabriella Donà, Francesca Rollo, Barbara Pichi, Giuseppe Spriano, Raul Pellini, Renato Covello, Edoardo Pescarmona, Giulia Fabbri, Manuela Scalfari, Tarik Gheit, Maria Benevolo
OBJECTIVES: The increasing incidence of HPV-related Oropharyngeal Squamous Cell Carcinoma (OPSCC) and the improved survival of HPV-positive OPSCC highlight the need for effective tools in evaluating HPV status on formalin-fixed paraffin-embedded (FFPE) cancers. To date, there is no agreement regarding the most appropriate method for HPV testing on FFPE materials. We aimed to investigate the performance of the Xpert® HPV assay (Cepheid) on crude lysates from OPSCC FFPE tissues. MATERIALS AND METHODS: Crude lysates were obtained by proteinase K digestion of FFPE tissues that had already been analyzed by the INNO-LiPA HPV assay and p16(ink4a) immunostaining...
September 2017: Oral Oncology
https://www.readbyqxmd.com/read/28783375/errors-using-observational-methods-for-ergonomics-assessment-in-real-practice
#20
Jose-Antonio Diego-Mas, Jorge Alcaide-Marzal, Rocio Poveda-Bautista
OBJECTIVE: The degree in which practitioners use the observational methods for musculoskeletal disorder risks assessment correctly was evaluated. BACKGROUND: Ergonomics assessment is a key issue for the prevention and reduction of work-related musculoskeletal disorders in workplaces. Observational assessment methods appear to be better matched to the needs of practitioners than direct measurement methods, and for this reason, they are the most widely used techniques in real work situations...
August 1, 2017: Human Factors
keyword
keyword
80671
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"