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Sample size calculation

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https://www.readbyqxmd.com/read/27925004/appropriate-osmotic-balance-duration-for-different-volumes-of-ovarian-tissue-in-vitrification-solution-a-study-of-ovary-tissue-vitrification-and-transplantation-in-sheep
#1
L Dang, X Zheng, Q Chang, Y Yang, Y Wang, Y Cai, C Hei, H Wang, C Zhao, W Zhu, Y Wang
:   BACKGROUND: Auto-transplantation of cryopreserved ovarian tissue has become a promising method for fertility preservation and standardization of the process is crucial for practical applications. OBJECTIVE: Here we used different size of large sheep ovarian cortex to study the most suitable osmotic balance durations in the vitrification solution for large piece ovary cortex. MATERIALS AND METHODS: The ovarian cortices from six-month old female sheep were divided into 40 cubic mm, 80 cubic mm and 160 cubic mm volume, A two-step osmotic balance method was used based on the results from morphological and histological study, we detected the expression of VEGF after thawing, the percentage of follicles that survived and serum E2 levels,together with apoptosis test by TUNEL...
September 2016: Cryo Letters
https://www.readbyqxmd.com/read/27923955/measles-outbreak-among-previously-immunized-healthcare-workers-the-netherlands-2014
#2
Susan J M Hahné, Laura M Nic Lochlainn, Nathalie D van Burgel, Jeroen Kerkhof, Jussi Sane, Kioe Bing Yap, Rob S van Binnendijk
BACKGROUND:  We investigated a measles outbreak among healthcare workers (HCWs) by assessing laboratory characteristics, measles vaccine effectiveness, and serological correlates for protection. METHODS:  Cases were laboratory-confirmed measles in HCWs from hospital X during weeks 12-20 of 2014. We assessed cases' severity and infectiousness by using a questionnaire. We tested cases' sera for measles immunoglobulin M, immunoglobulin G, avidity, and plaque reduction neutralization (PRN)...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27923401/effectiveness-of-the-who-safe-childbirth-checklist-program-in-reducing-severe-maternal-fetal-and-newborn-harm-in-uttar-pradesh-india-study-protocol-for-a-matched-pair-cluster-randomized-controlled-trial
#3
Katherine E A Semrau, Lisa R Hirschhorn, Bhala Kodkany, Jonathan M Spector, Danielle E Tuller, Gary King, Stuart Lipsitz, Narender Sharma, Vinay Pratap Singh, Bharath Kumar, Neelam Dhingra-Kumar, Rebecca Firestone, Vishwajeet Kumar, Atul A Gawande
BACKGROUND: Effective, scalable strategies to improve maternal, fetal, and newborn health and reduce preventable morbidity and mortality are urgently needed in low- and middle-income countries. Building on the successes of previous checklist-based programs, the World Health Organization (WHO) and partners led the development of the Safe Childbirth Checklist (SCC), a 28-item list of evidence-based practices linked with improved maternal and newborn outcomes. Pilot-testing of the Checklist in Southern India demonstrated dramatic improvements in adherence by health workers to essential childbirth-related practices (EBPs)...
December 7, 2016: Trials
https://www.readbyqxmd.com/read/27923329/identification-of-critical-intensity-from-a-single-lactate-measure-during-a-3-min-submaximal-cycle-ergometer-test
#4
Federico Y Fontana, Alessandro L Colosio, Daniel A Keir, Juan M Murias, Silvia Pogliaghi
We tested the hypothesis that critical intensity in cycling can be determined from a single delta blood lactate in the third minute of a submaximal cycle ergometer trial. Fourteen healthy young men performed four to six constant-power-output trials on a cycle ergometer to the limit of tolerance. Critical intensity was calculated via a linear model and subsequently validated. Lactate was measured at baseline and at 3 min from exercise onset. Delta lactate was the difference between these measures. Based on individual trials, we obtained the delta lactate-% validated critical intensity relationship and thereafter an estimate of critical intensity was computed...
December 6, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27922922/a-sleep-hygiene-and-relaxation-intervention-for-children-with-acute-lymphoblastic-leukemia-a-pilot-randomized-controlled-trial
#5
Sue Zupanec, Heather Jones, Lyndsey McRae, Efrosini Papaconstantinou, Julie Weston, Robyn Stremler
BACKGROUND: Sleep disturbance and fatigue are common and distressing pediatric cancer-related outcomes. Sleep hygiene education and relaxation techniques are recommended to improve sleep in healthy children and adult cancer survivors. No studies have tested these interventions to improve sleep and fatigue for children with acute lymphoblastic leukemia (ALL) in the home setting. OBJECTIVES: The aim of this study is to establish the feasibility and acceptability of a sleep hygiene and relaxation intervention to improve sleep and fatigue for children receiving maintenance chemotherapy for ALL...
December 5, 2016: Cancer Nursing
https://www.readbyqxmd.com/read/27919588/diagnostic-accuracy-of-the-berlin-questionnaire-stop-bang-stop-and-epworth-sleepiness-scale-in-detecting-obstructive-sleep-apnea-a-bivariate-meta-analysis
#6
REVIEW
Hsiao-Yean Chiu, Pin-Yuan Chen, Li-Pang Chuang, Ning-Hung Chen, Yu-Kang Tu, Yu-Jung Hsieh, Yu-Chi Wang, Christian Guilleminault
Obstructive sleep apnea (OSA) is a highly prevalent sleep disorder; however, it remains underdiagnosed and undertreated. Although screening tools such as the Berlin questionnaire (BQ), STOP-BANG questionnaire (SBQ), STOP questionnaire (STOP), and Epworth sleepiness scale (ESS) are widely used for OSA, the findings regarding their diagnostic accuracy are controversial. Therefore, this meta-analysis investigated and compared the summary sensitivity, specificity, and diagnostic odds ratio (DOR) among the BQ, SBQ, STOP, and ESS according to the severity of OSA...
November 5, 2016: Sleep Medicine Reviews
https://www.readbyqxmd.com/read/27919523/adjunctive-minocycline-for-schizophrenia-a-meta-analysis-of-randomized-controlled-trials
#7
Ying-Qiang Xiang, Wei Zheng, Shi-Bin Wang, Xin-Hu Yang, Dong-Bin Cai, Chee H Ng, Gabor S Ungvari, Deanna L Kelly, Wei-Ying Xu, Yu-Tao Xiang
This study aimed to conduct a meta-analysis of the efficacy and safety of adjunctive minocycline for schizophrenia. Randomized controlled trials (RCTs) comparing adjunctive minocycline with placebo in patients with schizophrenia were included in the meta-analysis. Two independent investigators extracted and synthesized data. Standard mean differences (SMDs), risk ratio (RR) ±95% confidence intervals (CIs) and the number-needed-to-harm (NNH) were calculated. Eight RCTs with 548 schizophrenia patient including 286 (52...
December 2, 2016: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27919389/older-patients-use-of-technology-for-a-post-discharge-nutritional-intervention-a-mixed-methods-feasibility-study
#8
T Lindhardt, M H Nielsen
BACKGROUND: Malnutrition is frequent in older people and a precursor for morbidity and hospitalisation; furthermore low intake and weight loss during and after hospitalisation is well-described. Such patients are often excluded from technology projects on account of lack of skills. This is a barrier for their access to many current and future health care offers. OBJECTIVES: To test the acceptability, feasibility and preliminary efficacy of technology-supported energy- and protein-enforced homedelivered meals for older patients discharged from hospital...
January 2017: International Journal of Medical Informatics
https://www.readbyqxmd.com/read/27914167/statistical-considerations-for-reporting-and-planning-heart-rate-variability-case-control-studies
#9
Daniel S Quintana
The calculation of heart rate variability (HRV) is a popular tool used to investigate differences in cardiac autonomic control between population samples. When interpreting effect sizes to quantify the magnitude of group differences, researchers typically use Cohen's guidelines of small (0.2), medium (0.5), and large (0.8) effects. However, these guidelines were originally proposed as a fallback for when the effect size distribution (ESD) was unknown. Despite the availability of effect sizes from hundreds of HRV studies, researchers still largely rely on Cohen's guidelines to interpret effect sizes and to perform power analyses to calculate required sample sizes for future research...
December 3, 2016: Psychophysiology
https://www.readbyqxmd.com/read/27913929/-inpatient-multimodal-pain-therapy-additive-value-of-neuromuscular-core-stability-exercises-for-chronic-back-pain
#10
F Giesche, H Streicher, M Maiwald, P Wagner
INTRODUCTION: The medical and healthcare economic burden caused by chronic lumbar back pain (CLBP) requires the use of interdisciplinary treatment approaches. The present study aimed to evaluate whether the effectiveness of inpatient multimodal pain therapy (MPT, operations and procedures (OPS) coding 8-918.02), can be increased by implementing additional neuromuscular core stability exercises (NCSE). MATERIAL AND METHODS: As part of a prospective controlled study, subjects with CLBP (n = 48, 17 males, 58...
December 2, 2016: Der Schmerz
https://www.readbyqxmd.com/read/27913831/high-transport-efficiency-of-nanoparticles-through-a-total-consumption-sample-introduction-system-and-its-beneficial-application-for-particle-size-evaluation-in-single-particle-icp-ms
#11
Shin-Ichi Miyashita, Hiroaki Mitsuhashi, Shin-Ichiro Fujii, Akiko Takatsu, Kazumi Inagaki, Toshiyuki Fujimoto
In order to facilitate reliable and efficient determination of both the particle number concentration (PNC) and the size of nanoparticles (NPs) by single-particle ICP-MS (spICP-MS) without the need to correct for the particle transport efficiency (TE, a possible source of bias in the results), a total-consumption sample introduction system consisting of a large-bore, high-performance concentric nebulizer and a small-volume on-axis cylinder chamber was utilized. Such a system potentially permits a particle TE of 100 %, meaning that there is no need to include a particle TE correction when calculating the PNC and the NP size...
December 2, 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27913280/neuropsychological-functioning-and-chronic-methadone-use-a-systematic-review-and-meta-analysis
#12
REVIEW
A Baldacchino, M Armanyous, D J K Balfour, G Humphris, K Matthews
INTRODUCTION: There is a presumption that neurocognition is commonly impaired in chronic methadone exposed individuals (CM) when compared with healthy controls (HP). Additionally, it remains unclear if short term (<1year) abstinence (AP) is associated with an altered cognitive profile when compared with CM. METHOD: A random effect model approach was used on data assembled into the Comprehensive Meta-Analysis programme. Cohen's d effect sizes and a significance levels of p<0...
November 29, 2016: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/27911892/authorization-of-animal-experiments-is-based-on-confidence-rather-than-evidence-of-scientific-rigor
#13
Lucile Vogt, Thomas S Reichlin, Christina Nathues, Hanno Würbel
Accumulating evidence indicates high risk of bias in preclinical animal research, questioning the scientific validity and reproducibility of published research findings. Systematic reviews found low rates of reporting of measures against risks of bias in the published literature (e.g., randomization, blinding, sample size calculation) and a correlation between low reporting rates and inflated treatment effects. That most animal research undergoes peer review or ethical review would offer the possibility to detect risks of bias at an earlier stage, before the research has been conducted...
December 2016: PLoS Biology
https://www.readbyqxmd.com/read/27910970/exploration-of-hydrogen-bond-networks-and-potential-energy-surfaces-of-methanol-clusters-using-a-two-stage-clustering-algorithm
#14
Po-Jen Hsu, Kun-Lin Ho, Sheng-Hsien Lin, Jer-Lai Kuo
The potential energy surface (PES), structures and thermal properties of methanol clusters (MeOH)n with n = 8-15 were explored by replica-exchange molecular dynamics (REMD) simulations with an empirical model and refined using density functional theory (DFT) methods. For a given size, local minima structures were sampled from REMD trajectories and archived by a newly developed molecular database via a two-stage clustering algorithm (TSCA). Our TSCA utilizes both the topology of O-HO hydrogen bonding networks and the similarity of the shapes to filter out duplicates...
December 2, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27909808/clinical-validation-of-a-novel-urine-based-metabolomic-test-for-the-detection-of-colonic-polyps-on-chinese-population
#15
Lu Deng, Hong Fang, Victor K Tso, Yuanyuan Sun, Rae R Foshaug, Spencer C Krahn, Fen Zhang, Yujie Yan, Huilin Xu, David Chang, Yong Zhang, Richard N Fedorak
PURPOSE: Colorectal cancer is the fifth leading cause of cancer-related deaths in China. When detected early, with the removal of adenomatous polyps, precursors of colorectal cancer, it is preventable. The aim of this study was to evaluate a novel urine-based metabolomic diagnostic test for the detection of adenomatous polyps, PolypDx™, that was originally developed and validated using 1000 samples from Canadian Cohort, on Chinese population. METHODS: Prospective urine samples were collected from 1000 participants undergoing colonoscopy examination, from March 2013 to July 2014 at Minhang District, Shanghai Centre for Disease Control and Prevention...
December 1, 2016: International Journal of Colorectal Disease
https://www.readbyqxmd.com/read/27908118/free-energy-calculations-along-entropic-pathways-i-homogeneous-vapor-liquid-nucleation-for-atomic-and-molecular-systems
#16
Caroline Desgranges, Jerome Delhommelle
Using the entropy S as a reaction coordinate, we determine the free energy barrier associated with the formation of a liquid droplet from a supersaturated vapor for atomic and molecular fluids. For this purpose, we develop the μVT-S simulation method that combines the advantages of the grand-canonical ensemble, that allows for a direct evaluation of the entropy, and of the umbrella sampling method, that is well suited to the study of an activated process like nucleation. Applying this approach to an atomic system such as Ar allows us to test the method...
November 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27905339/association-between-the-p53-codon-72-polymorphism-and-primary-open-angle-glaucoma-risk-meta-analysis-based-on-11-case-control-studies
#17
Mohsen Gohari, Hossein Neámatzadeh, Mohammad Ali Jafari, Mahta Mazaheri, Masoud Zare-Shehneh, Elahe Abbasi-Shavazi
The TP53 is important in functions of cell cycle control, apoptosis, and maintenance of DNA integrity. Studies on the association between p53 codon 72 polymorphism and primary open-angle glaucoma (POAG) risk have yielded conflicting results. Published literature from PubMed and Web of Science databases was retrieved. All studies evaluating the association between p53 codon 72 polymorphisms and POAG were included. Pooled odds ratio (OR) and 95% confidence interval (CI) were calculated. Eleven separate studies including 2541 cases and 1844 controls were pooled in the meta-analysis...
October 2016: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/27904554/effect-of-helicobacter-pylori-eradication-on-insulin-resistance-among-prediabetic-patients-a-pilot-study-and-single-blind-randomized-controlled-clinical-trial
#18
Ali Kachuei, Masoud Amini, Vahid Sebghatollahi, Awat Feizi, Pooria Hamedani, Bijan Iraj
BACKGROUND: Type II diabetes mellitus (T2DM) is the prevalent type of diabetes in the world. Prediabetic patients are the most probable group to get diabetes. Several studies have mentioned the role of inflammation in the incidence of diabetes. The origin of inflammation can be infection such as Helicobacter pylori (HP) infection. This study was designed to explore the effect of HP eradication on insulin resistance. MATERIALS AND METHODS: This single-blind randomized controlled clinical trial was conducted in 2014-2015...
2016: Journal of Research in Medical Sciences: the Official Journal of Isfahan University of Medical Sciences
https://www.readbyqxmd.com/read/27904087/push-out-bond-strength-of-a-new-post-system-after-various-post-space-treatments
#19
Melek Akman, Ayçe Unverdi Eldeniz, Selen Ince, Mehmet Burak Guneser
To assess the effect of post-space treatment with chelating agents on the push-out bond-strength of a glass fiber post-system. Fortyeight human teeth were decoronated. The roots were prepared to size 40 and obturated. The post-spaces were prepared with PeesoReamer drills. The post-spaces were irrigated with (i) NaOCl and EDTA with chlorhexidine (QMix), (ii) NaOCl and EDTA, (iii) NaOCl and Citric acid, (iv) NaOCl and saline as a control group. i-TFC glass fiber posts were then luted with i-TFC bond system. The samples were horizontally sectioned...
2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27902751/exploration-of-a-polygenic-risk-score-for-alcohol-consumption-a-longitudinal-analysis-from-the-alspac-cohort
#20
Michelle Taylor, Andrew J Simpkin, Philip C Haycock, Frank Dudbridge, Luisa Zuccolo
BACKGROUND: Uncertainty remains about the true extent by which alcohol consumption causes a number of health outcomes. Genetic variants, or combinations of variants built into a polygenic risk score (PGRS), can be used in an instrumental variable framework to assess causality between a phenotype and disease outcome of interest, a method known as Mendelian randomisation (MR). We aimed to identify genetic variants involved in the aetiology of alcohol consumption, and develop a PGRS for alcohol...
2016: PloS One
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