In a Phase III cancer prevention clinical trial of a study agent, the group that receives either a placebo or a standard agent that is being compared to a new agent.
A group of key or highly compensated employees in a company whose proportion of benefits is limited under the qualification requirements of certain benefit plans (e.g., Â§125 or Â§401(k) plans). Also, employers may not use the commuting valuation method for such employees when determining the value of their personal use of a company-provided vehicle.
In an experiment, the control group is the group of subjects (people or objects) that exist in the same conditions as the experimental group, but do not undergo the treatment or factor being studied. In an experiment on how plants react to limited light, the control plant and the experimental plant would receive the same amount of water and plant food. However, the experimental plant would sit in a windowless room to keep out sunlight, while the control plant would sit by a window and receive normal levels of light.