Quantitative Concept
confidence interval
con·fi·dence in·ter·val
Definitions related to confidence intervals:
  • A range of values for a parameter that may contain the parameter and the degree of confidence that it is in fact there.
    NCI
    U.S. National Cancer Institute, 2021
  • A range of values for a variable of interest, e.g., a rate, constructed so that this range has a specified probability of including the true value of the variable.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • (confidence interval (ci)) A measure of the precision of an estimated value. The interval represents the range of values, consistent with the data, that is believed to encompass the "true" value with high probability (usually 95%). The confidence interval is expressed in the same units as the estimate. Wider intervals indicate lower precision; narrow intervals, greater precision.
    CDISC Terminology
    Clinical Data Interchange Standards Consortium (CDISC), 2021
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.