- ValidityScientific validity refers to how well a measurement, test or study measures what it is intended to measure.
- Vulnerable participants or populationsVulnerable participants or populations are individuals or groups of individuals who are unable to give informed consent to take part in a clinical trial, such as children or people affected by mental health conditions, or who may come under pressure from others to take part. It also includes(...)
- Wash out periodIn a clinical trial, this refers to a break in ongoing treatment. It is quite often used in crossover trials where a set period is defined before switching to a new medicine. In this period the levels of the previous medicine in the body and the effects should be reduced to zero.