Sampling Studies

抽样研究
  • 文章类型: Journal Article
    受访者驱动的抽样(RDS)是从难以接触的人群中招募参与者的一种越来越流行的方法,传统上用于估计边缘化人群中的艾滋病毒流行率。2015年发布了STROBE-RDS指南,以改善这些研究的报告。我们旨在确定RDS的当前应用以及这些研究的报告质量。
    扫射,PubMed,和CINAHL数据库用于查找2017年发表的与RDS相关的论文。根据研究结果和目标人群对符合使用RDS的横断面研究纳入标准的论文进行分类。选择25篇论文的随机样本来评估使用STROBE-RDS指南的报告质量。
    和男人发生性关系的男人,注射毒品的人,在RDS研究中,女性性工作者是最常见的人群;超过一半的研究检查了艾滋病毒的流行。报告质量相对于原始的STROBE指南是好的,但在研究的RDS特定方面通常较弱。包括招聘和统计分析。
    大多数作者都在适当地使用RDS,并意识到需要对RDS数据进行统计调整。尽管如此,应更广泛地传播STROBE-RDS指南,以促进更好地报告RDS研究的关键方面.
    Respondent-driven sampling (RDS) is an increasingly popular method of recruiting participants from hard-to-reach populations and has traditionally been used to estimate the prevalence of HIV among marginalized people. The STROBE-RDS guidelines were published in 2015 to improve the reporting of these studies. We aim to determine the current applications of RDS and the quality of reporting of these studies.
    The SCOPUS, PubMed, and CINAHL databases were used to find papers published in 2017, relating to RDS. Papers meeting the inclusion criteria of cross-sectional studies using RDS were classified according to the study outcome and target population. A random sample of 25 papers was selected to evaluate the quality of reporting using the STROBE-RDS guidelines.
    Men who have sex with men, people who inject drugs, and female sex workers were the most common populations for RDS studies; over half of the studies examined the HIV epidemic. Quality of reporting is good with respect to the original STROBE guidelines but is generally weaker with respect to RDS-specific aspects of the study, including recruitment and statistical analysis.
    Most authors are using RDS appropriately and aware of the need for statistical adjustments to RDS data. Nonetheless, the STROBE-RDS guidelines should be more widely disseminated to promote better reporting of key aspects of RDS studies.
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  • 文章类型: Journal Article
    我探讨了定性研究中达到理论饱和所需的样本量。我将种群概念化为由包含不同类型的信息源的子种群组成,这些信息源包含许多代码。在样品中观察到群体中的所有代码一次后达到理论饱和。我描绘了三种不同的场景来采样信息源:“随机机会,“这是基于概率抽样的,\"最少的信息,“每个采样步骤至少产生一个新代码,和“最大信息,\",每个采样步骤产生最大数量的新代码。接下来,我使用模拟来评估每个方案的最小样本量,以系统地变化的假设人群。我表明,理论饱和度更多地取决于观察代码的平均概率,而不是总体中的代码数量。此外,最小和最大信息场景比随机机会有效得多,但每个代码的重复次数更少,以验证结果。我制定了有目的的抽样指南,并建议研究人员遵循最少的信息情景。
    I explore the sample size in qualitative research that is required to reach theoretical saturation. I conceptualize a population as consisting of sub-populations that contain different types of information sources that hold a number of codes. Theoretical saturation is reached after all the codes in the population have been observed once in the sample. I delineate three different scenarios to sample information sources: \"random chance,\" which is based on probability sampling, \"minimal information,\" which yields at least one new code per sampling step, and \"maximum information,\" which yields the largest number of new codes per sampling step. Next, I use simulations to assess the minimum sample size for each scenario for systematically varying hypothetical populations. I show that theoretical saturation is more dependent on the mean probability of observing codes than on the number of codes in a population. Moreover, the minimal and maximal information scenarios are significantly more efficient than random chance, but yield fewer repetitions per code to validate the findings. I formulate guidelines for purposive sampling and recommend that researchers follow a minimum information scenario.
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  • 文章类型: Comparative Study
    在中风模型中使用大鼠的许多研究未能转化为成功的人类临床试验。中风治疗学术行业圆桌会议(STAIR)已经制定了用于临床前试验的啮齿动物中风模型指南,以促进动物研究成功转化为人类研究。这些指南还强调了麻醉和监测技术的重要性。这篇文献综述的目的是记录麻醉方案(即,代理商的选择,通风方式,自2009年STAIR指南发布以来,对生理支持和监测)进行了修订。从PubMed数据库中随机选择了许多描述2005年和2015年在成年大鼠中使用中风模型的文章,并分析了以下参数:进行研究的国家,使用的大鼠品系,中风诱导技术,麻醉剂的诱导和维持,插管和通气模式,监测技术,控制体温,血管通路,静脉输液和镇痛药。对于每个参数(stroke,归纳法,维护,监测),我们使用精确的卡方检验来确定比例是否在一年之间存在显著差异,并对p值进行多重比较校正.对每个参数使用精确的P检验以比较每个值的频率分布,然后进行Bonferroni检验。显著水平设定在<0.05。结果表明,在2005年至2015年之间,麻醉和监测技术的差异很小。2015年,在中国进行的研究明显增多,使用异氟烷和一氧化二氮的研究明显减少。最引人注目的发现是,2005年和2015年的所有研究中,绝大多数都没有报告使用通气;血气测量,潮气末二氧化碳浓度,或血压;或给予静脉输液或镇痛药。对2015年发表的文章的回顾表明,STAIR指南似乎对实验性中风诱导大鼠的麻醉和监测技术没有影响。尽管2009年发布了上述指南。
    Numerous studies using rats in stroke models have failed to translate into successful clinical trials in humans. The Stroke Therapy Academic Industry Roundtable (STAIR) has produced guidelines on the rodent stroke model for preclinical trials in order to promote the successful translation of animal to human studies. These guidelines also underline the importance of anaesthetic and monitoring techniques. The aim of this literature review is to document whether anaesthesia protocols (i.e., choice of agents, mode of ventilation, physiological support and monitoring) have been amended since the publication of the STAIR guidelines in 2009. A number of articles describing the use of a stroke model in adult rats from the years 2005 and 2015 were randomly selected from the PubMed database and analysed for the following parameters: country where the study was performed, strain of rats used, technique of stroke induction, anaesthetic agent for induction and maintenance, mode of intubation and ventilation, monitoring techniques, control of body temperature, vascular accesses, and administration of intravenous fluids and analgesics. For each parameter (stroke, induction, maintenance, monitoring), exact chi-square tests were used to determine whether or not proportions were significantly different across year and p values were corrected for multiple comparisons. An exact p-test was used for each parameter to compare the frequency distribution of each value followed by a Bonferroni test. The level of significant set at < 0.05. Results show that there were very few differences in the anaesthetic and monitoring techniques used between 2005 and 2015. In 2015, significantly more studies were performed in China and significantly fewer studies used isoflurane and nitrous oxide. The most striking finding is that the vast majority of all the studies from both 2005 and 2015 did not report the use of ventilation; measurement of blood gases, end-tidal carbon dioxide concentration, or blood pressure; or administration of intravenous fluids or analgesics. The review of articles published in 2015 showed that the STAIR guidelines appear to have had no effect on the anaesthetic and monitoring techniques in rats undergoing experimental stroke induction, despite the publication of said guidelines in 2009.
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  • 文章类型: Journal Article
    METHODS: Case series.
    BACKGROUND: This paper describes conservative guidelines for the management of scapho-lunate interosseous ligament (SLIL) injury including fabrication of an orthosis that restricts active wrist movement to the dart-throwers (DTM) plane.
    OBJECTIVE: The dart throwers\' orthosis (DTO) was designed as a response to biomechanical studies suggesting that restraining motion to the DTM would off-load a deficient SLIL.
    METHODS: After six weeks of wearing the DTO, the 5 patients in this case series initiated an exercise program that incorporated wrist proprioceptive training and specific muscle strengthening.
    CONCLUSIONS: The DTO was designed to incorporate controlled movement in order to better integrate the secondary wrist stabilizers in wrists that had a deficient SLIL. The orthosis and the exercise program harnessed proprioceptive influences using active motion within the DTM plane, and stimulated mechanoreceptors so as to enhance stability.
    RESULTS: All patients demonstrated improvement in subjective and objective outcomes including self-reported pain and function.
    CONCLUSIONS: Orthotic intervention that controls motion within the DTM, combined with an appropriate proprioceptive rehabilitation program, may provide a viable conservative treatment option for patients with a similar clinical presentation.
    METHODS: 4.
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  • 文章类型: English Abstract
    OBJECTIVE: Elderly with several pathologies are usually treated with many drugs, and are exposed to a majored risk of drug-induced adverse effects. A network of local nursing homes (EHPAD) in the south Seine-Saint-Denis area (France) created a geriatric drug guidelines to improve the quality of the drugs prescriptions. This study assesses the conformity of prescriptions in elderly patients prior and after the distribution of the booklet.
    METHODS: This before and after design study focused on the drug prescriptions for patients in eight EHPAD followed for two randomly given days in 2012 (n = 503) and 2013 (n = 334). The geriatric drug guidelines included a list of medicines suitable for the elderly (conformity list) and recommendations for prescription and monitoring. Data collection was conducted from medical records and interviews with coordinators doctors and nursing staff in nursing homes. A 6 items-quality score was calculated, ranging from 0 (lowest quality) to 6 (highest quality).
    RESULTS: Median age, weight and creatinine level were respectively 88 years, 61.0 kg, and 74.9 μmol/L (prior) and 88 years, 59.6 kg, and 77.0 μmol/L (after). Median times of latest serum creatinine dosage were 112 days (prior) and 108 days (after). The median number of prescribed drugs was 8 per resident during the two period of study. The conformity rate of prescription was better prior the distribution of the guidelines, respectively 87.5% and 80.0% (p<10⁻³). The average formal quality score was better after the distribution of the booklet increasing form 4.23 to 4.40 points (p<10⁻⁴). For high risk inducing drugs, monitoring was prescribed in 34.2% (prior) and 32.4% (after).
    CONCLUSIONS: This study shows that the drug geriatric guidelines does not improve prescription conformity and monitoring for high risk drugs, but it does significantly improve the median formal quality score.
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  • 文章类型: Journal Article
    Intrinsic plus foot deformity has primarily been associated with cerebral palsy and involves spastic contracture of the intrinsic musculature with resultant toe deformities. Digital deformity is caused by a dynamic imbalance between the intrinsic muscles in the foot and extrinsic muscles in the lower leg. Spastic contracture of the toes frequently involves curling under of the lesser digits or contracture of the hallux into valgus or plantarflexion deformity. Patients often present with associated pressure ulcers, deformed toenails, shoe or brace fitting challenges, and pain with ambulation or transfers. Four different patterns of intrinsic plus foot deformity have been observed by the authors that likely relate to the different patterns of muscle involvement. Case examples are provided of the 4 patterns of intrinsic plus foot deformity observed, including global intrinsic plus lesser toe deformity, isolated intrinsic plus lesser toe deformity, intrinsic plus hallux valgus deformity, and intrinsic plus hallux flexus deformity. These case examples are presented to demonstrate each type of deformity and our approach for surgical management according to the contracture pattern. The surgical approach has typically involved tenotomy, capsulotomy, or isolated joint fusion. The main goals of surgical treatment are to relieve pain and reduce pressure points through digital realignment in an effort to decrease the risk of pressure sores and allow more effective bracing to ultimately improve the patient\'s mobility.
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  • 文章类型: Journal Article
    OBJECTIVE: The authors had for objective to evaluate the applicability of AFSSAPS guidelines for aminoglycoside use to geriatric patients.
    METHODS: Theoretical doses and dosing regimens allowing reaching target concentrations in this population were calculated by applying a pharmacokinetic model to 30 geriatric patients treated by amikacin.
    RESULTS: The dose allowing reaching a maximum concentration of 60 mg/L was 1.217 mg on average. The time required to reach a blood concentration lower than or equal to 2.5mg/L was 62.5±70.4 hours. Forty-six percent of patients had a trough concentration greater than 2.5 mg/L, 48 hours after administration. For these patients, the time between critical minimum inhibitory concentration (MIC) and toxicity threshold concentration was 21.9±14.9 hours.
    CONCLUSIONS: Reaching a target concentration can be problematic in geriatric patients. It is frequently necessary to use dosing intervals greater than 48 hours. The effectiveness and safety of these regimens remain uncertain.
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    文章类型: Journal Article
    Using Ajzen and Madden\'s Theory of Planned Behavior, this study investigates factors which influence nurses\' intention to apply clinical practice guidelines in their daily ward work. A convenience sample of 91 nurses in internal medicine wards in three Israeli hospitals answered four questionnaires. Data were processed by Pearson correlation coefficients and multivariate regression. The main findings were that burnout was negatively correlated with the intention to work according to guidelines and that professionalism (in the sense of a tendency to follow taught procedure rather than personal judgment) was positively correlated with it. Furthermore, nurses who perceive their behavioral control and subjective norms to be positive will be the most determined to work according to guidelines, provided they personally command the necessary resources to do so.
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  • 文章类型: Journal Article
    BACKGROUND: The perioperative management of patients with a coronary artery stent is a major patient safety issue currently confronting clinicians. Surgery on a patient on antiplatelet therapy creates the following dilemma: is it better to withdraw the drugs and reduce the hemorrhagic risk or to maintain them and reduce the risk of a myocardial ischemic event?
    METHODS: An electronic survey was used to sample a cross-section of local clinicians regarding the perioperative management of patients with an indwelling coronary artery stent. The reiterative Consensus-Oriented Decision-Making model was applied by an institutional task force with representation from anesthesiology, cardiology, primary care medicine, and surgery.
    RESULTS: Significant disagreement existed among the multidisciplinary survey respondents regarding various aspects of the perioperative management of patients with indwelling coronary artery stents.
    CONCLUSIONS: We clarified the perioperative risk factors for coronary stent thrombosis and an alternate process for immediate access to a cardiac catheterization laboratory at our institution.
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  • 文章类型: Journal Article
    背景:当前的方法学指南提供了有关RCT中亚组分析评估的建议,但不要指定明确的评估标准。我们的目标是为研究人员提供一套标准,以促进主持人的证据分级,在系统评价中。
    方法:我们使用滚雪球技术从方法学手稿(n=18)中开发了一套标准,和电子数据库搜索。标准由国际德尔菲小组(n=21)审查,包括在这一领域发表方法学论文的作者,以及活跃于随机对照试验亚组分析研究的研究人员。我们使用研究开发/加州大学洛杉矶分校适当性方法来评估定量数据的共识。自由回应被编码为共识和分歧。在随后的一轮中,从Cochrane审阅者手册中提取了其他标准,这个过程被重复。
    结果:建议荟萃分析人员报告亚组分析的验证性和探索性结果。验证性发现必须仅来自进行基于先验声明的特定理论/证据的研究。探索性发现可用于为未来/后续试验提供信息。然而,纳入主持人的荟萃分析,应将以下附加标准应用于每项研究:在随机化之前应测量基线因素,基线因素的测量应具有足够的信度和效度,必须对基线因素和干预措施之间的相互作用进行具体测试。
    结论:来自21位国际专家的共识是,在RCT系统评价中评估主持人的方法学标准既及时又必要。专家的共识导致在合成证据时将五个标准分为两组:支持主持人假设的验证性发现和为未来研究提供信息的探索性发现。这些建议是参考以前关于评估和报告主持人研究的建议进行讨论的。
    BACKGROUND: Current methodological guidelines provide advice about the assessment of sub-group analysis within RCTs, but do not specify explicit criteria for assessment. Our objective was to provide researchers with a set of criteria that will facilitate the grading of evidence for moderators, in systematic reviews.
    METHODS: We developed a set of criteria from methodological manuscripts (n = 18) using snowballing technique, and electronic database searches. Criteria were reviewed by an international Delphi panel (n = 21), comprising authors who have published methodological papers in this area, and researchers who have been active in the study of sub-group analysis in RCTs. We used the Research ANd Development/University of California Los Angeles appropriateness method to assess consensus on the quantitative data. Free responses were coded for consensus and disagreement. In a subsequent round additional criteria were extracted from the Cochrane Reviewers\' Handbook, and the process was repeated.
    RESULTS: The recommendations are that meta-analysts report both confirmatory and exploratory findings for sub-groups analysis. Confirmatory findings must only come from studies in which a specific theory/evidence based a-priori statement is made. Exploratory findings may be used to inform future/subsequent trials. However, for inclusion in the meta-analysis of moderators, the following additional criteria should be applied to each study: Baseline factors should be measured prior to randomisation, measurement of baseline factors should be of adequate reliability and validity, and a specific test of the interaction between baseline factors and interventions must be presented.
    CONCLUSIONS: There is consensus from a group of 21 international experts that methodological criteria to assess moderators within systematic reviews of RCTs is both timely and necessary. The consensus from the experts resulted in five criteria divided into two groups when synthesising evidence: confirmatory findings to support hypotheses about moderators and exploratory findings to inform future research. These recommendations are discussed in reference to previous recommendations for evaluating and reporting moderator studies.
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