A type of clinical trial in which observations made during the trial are compared to a standard, called the control. The control may be observations of a group of participants in the same trial or obs [..]

A prospective experimental study in which subjects are non-randomly assigned to either a control or intervention group. Outcome measures are assessed after an appropriate follow-up time and results are compared between the control and intervention groups.

A type of clinical trial in which observations made during the trial are compared to a standard (called the control). The control may be observations from a group of participants in the same trial or [..]

A type of clinical trial that includes a control arm. Outcomes in the control arm are compared with those in the experimental arm to determine any differences, for example, in safety and effectiveness. See Related Term(s): Clinical Trial, Control Arm, Experimental Arm

See clinical trial. This is an indexing term used in MEDLINE and CENTRAL. Within CENTRAL it refers to trials using quasi-randomisation, or trials where double blinding was used but randomisation was not mentioned.

A clinical trial that has a control group. Such trials are not necessarily randomised.See also: Aggregate data

A trial that compares two or more treatments to find out which one is more effective.