AJAX progress indicator
  • Validity
    Scientific validity refers to how well a measurement, test or study measures what it is intended to measure.
  • Vulnerable participants or populations
    Vulnerable 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 period
    In 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.

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