NIH's policies were created to improve the accountability and transparency of clinical research impacting all applications involving clinical trials.
|Clinical Trials Involving Human Subjects|
|The NIH is launching a series of policies to improve the accountability and transparency of clinical research. These upcoming changes will impact all applications involving clinical trials. Learn more aboutthe new requirements, and determine if your study meetsthe NIH definition of a clinical trial.
|Trials That Randomize Groups or Clusters or That Deliver Interventions to Groups|
|实验s, including clinical trials, differ in the methods used to assign participants to study conditions or arms and to deliver interventions. The NIH has a new website that providesguidance on research methodsrelated to experiments that randomize groups or clusters or that deliver interventions to groups. The information is relevant for human and animal studies and for basic and applied research. The website includes acalculator to estimate sample size requirementsfor group- or cluster-randomized trials.|