发表在具有影响力的一般医学期刊上随机对照试验的资格标准:系统抽样审查
Harriette G C Van Spall1, Andrew Toren, Alex Kiss
1Department of Medicine, University of Toronto, Toronto, Ontario.
JAMA
|March 22, 2007
概括
随机对照试验 (RCT) 经常排除不同患者群体,影响结果的概括性. 这些排除的理由往往不清楚,需要改善临床试验中的报告和考虑.
科学领域:
- 临床试验 临床试验
- 医学研究方法学 医学研究方法学
- 基于证据的医学基于证据的医学.
背景情况:
- 随机对照试验 (RCT) 依赖于可行性和有效性的选择性资格标准.
- 在RCT中排除特定患者群体可能会限制研究结果的概括性.
- 了解排除标准对于解释试验结果及其适用性至关重要.
研究的目的:
- 分析在主要医学期刊上发表的RCT中排除标准的性质和程度.
- 评估排斥标准如何影响试验结果中不同患者人口统计的代表性.
- 评估共同排除标准所提供的理由.
主要方法:
- 在MEDLINE系统搜索1994-2006年间发表在具有影响力的一般医学期刊上的RCT.
- 从最初的4827篇文章中选择了283篇相关的RCT.
- 排除标准的独立提取和重复分类 (强烈,潜在或缺乏理由).
主要成果:
- 常见的医疗状况 (81.3%),年龄 (72.1%),并发药物 (54.1%) 和女性性别 (39.2%) 是常见的排除基础.
- 只有47.2%的排除标准被认为是有充分理由的;12.0%没有报告.
- 药物干预和多中心试验表现出更广泛的排除,特别是在药物使用和并发症方面,理由较差.
结论:
- 主要期刊中的RCT往往缺乏明确的报告和排除标准的证明.
- 经常排斥妇女,儿童,老年人和那些有共同条件的人限制了概括性.
- 透明的报告和排除标准的证明对于提高RCT的临床实用性至关重要.
相关概念视频
Randomized Experiments
The randomization process involves assigning study participants randomly to experimental or control groups based on their probability of being equally assigned. Randomization is meant to eliminate selection bias and balance known and unknown confounding factors so that the control group is similar to the treatment group as much as possible. A computer program and a random number generator can be used to assign participants to groups in a way that minimizes bias.
Simple randomization
Simple...
Simple randomization
Simple...
Clinical Trials
Clinical trials are prospective experimental studies conducted on humans to determine the safety and efficacy of treatments, drugs, diet methods, and medical devices. Using statistics in clinical trials enables researchers to derive reasonable and accurate conclusions from the collected data, allowing them to make wise decisions in uncertain situations. In medical research, statistical methods are crucial for preventing errors and bias.
There are four phases in a clinical trial. A phase one...
There are four phases in a clinical trial. A phase one...
Blinding
Blinding is a commonly used method of not telling participants which treatment a subject is receiving. Blinding is a critical part of a randomized control trial or RCT. It reduces the bias that affects the results. In an RCT, blinding is used in the form of a placebo. A placebo effect occurs when untreated subjects falsely believe they have received the treatment and report improved symptoms. A placebo or a dummy treatment is administered to subjects to negate the bias caused by such an effect.
Clinical Trials: Overview
Clinical development focuses on how the drug will interact with the human body and encompasses four key phases of clinical trials, each serving a specific purpose in assessing the safety and effectiveness of new drugs. These phases overlap and build upon one another. Phase I involves a small group of healthy volunteers (typically 20-80 individuals) or, in cases where significant toxicity is expected, patients with the targeted disease, such as cancer or AIDS. The volunteers are tested for...
Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches
Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast, controlled...
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast, controlled...
Hazard Ratio
The hazard ratio (HR) is a widely used measure in clinical trials to compare the risk of events, such as death or disease recurrence, between two groups over time. It reflects the ratio of hazard rates—the instantaneous risk of the event occurring—between a treatment group and a control group. This measure provides valuable insights into the relative effectiveness of a treatment by assessing how the risk of an event differs between the two groups.
For example, in a clinical trial evaluating a...
For example, in a clinical trial evaluating a...

