Public review preview. Candidate definitions have not yet been read by the two reviewers. Each entry shows its review status.
research methods

Judged: two independent readers; copy check clear.

controlled trial

controlled trial A controlled trial is a study that compares the effects of one intervention with another on chosen outcomes.

A controlled trial is a study that compares the effects of one intervention with another on chosen outcomes. In a randomized controlled trial, participants are assigned to the comparison conditions by chance.