randomized controlled trial

Syllable breakdown

Dictionary meaning

a clinical research study design in which participants are randomly assigned to receive either the intervention being tested or a control condition (placebo or standard care), allowing causal inference about the effect of the intervention by eliminating selection bias; randomisation ensures that known and unknown confounding factors are distributed equally between groups on average, so that observed differences in outcomes can be attributed to the intervention rather than pre-existing differences between participants; RCTs are considered the gold standard for evaluating therapeutic interventions, and their results form the primary evidence base for clinical guidelines; limitations include external validity (whether trial results generalise to real-world patients), ethical constraints on withholding effective treatments, and the difficulty of blinding for non-pharmacological interventions