Current Concepts and State of Knowledge

The main phases of an RCT are shown in the Fig. 1

Study Planning and Protocol Development

Before starting to design an RCT, the two key questions to be asked are (1) whether the tested intervention is sufficiently well developed to permit evaluation, and (2) whether there is enough preliminary evidence that the intervention is likely to be beneficial (most frequently, this evidence comes from observational studies). The development of a new pharmaceutical is conventionally divided into phases, with the initial preclinical toxicity and pharmacological work leading to small preliminary trials in human volunteers (► phase I), then small (perhaps 30-50 participants), usually randomized, studies in patients, before the pivotal ► phase III RCTs of efficacy and safety. Noncommercial trials will try to replicate this approach. The retrieval of preliminary data will need to

Randomized Controlled Trials. Fig. 1. The main phases of a randomized controlled trial.

Was this article helpful?

0 0
Natural Treatments For Dandruff

Natural Treatments For Dandruff

Stop Your Scalp From Snowing! Finally... A Real Cure for Dandruff! No medication! No weird cures! No messy creams, smelly solutions or strange diets! Are you sick to death of being sold products that could make the problem worse? Are you sick of the shampoos and conditioners that make your head smell like sulphur? If so then try a permanent revolutionary treatment for dandruff!

Get My Free Ebook


Post a comment