Statistical significance does not directly provide information about the strength of an observed association, so we need confidence intervals to assure the strength of an association.
Confidence intervals, primarily found in the Results section of a clinical study, tell us how confident we can be that the true treatment effect is captured within a specific range of values. Confidence limits are the values that define the range of the confidence intervals.
Confidence intervals of 95% in a clinical study represents that there is a 95% certainty
that the true treatment effect lies within the range provided, as shown in the graphic below: