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Glossary

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
  • i4i

    The NIHR Invention for Innovation (i4i) Programme supports the preclinical and clinical development of medical devices in areas of existing or emerging patient need.
  • Interaction

    The situation in which the effect of one independent variable on the outcome is affected by the value of a second independent variable.
  • Interim analysis

    Analysis comparing intervention groups at any time before the formal completion of a trial, usually before recruitment is complete. Often used with stopping rules so that a trial can be stopped if participants are being put at risk unnecessarily. Timing and frequency of interim analyses should be specified in the protocol.
  • Intervention

    The process of intervening on people, groups, entities or objects in an experimental study. In controlled trials, the word is sometimes used to describe the regimens in all comparison groups, including placebo and no-treatment arms.
  • Intervention group

    A group of participants in a study receiving a particular health care intervention. Parallel group trials include at least two intervention groups.
  • Invention for Innovation

    The NIHR Invention for Innovation (i4i) Programme supports the preclinical and clinical development of medical devices in areas of existing or emerging patient need.