Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle. Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle.
The term âfutilityâ is used to refer to the inability of a clinical trial to achieve its objectives. In particular, stopping a clinical trial when the interim results suggest that it is unlikely to achieve statistical significance can save resources that could be used on more promising research.
Definition of a Clinical Trial. The World Health Organization (WHO) defines a clinical trial as âany research study that prospectively assigns human participants or groups of humans to one or more health-related interventions to evaluate the effects on health outcomes.