The analysis of data from a randomisedcontrol trial (RCT) usually provides an estimate of the treatment effect, which is the difference in the outcome between the comparison groups (e.g. intervention and control). TheCONSORT guidelines 2010recommend that reports ofRCTsshould include a confidence interval for the estimated treatment effect. A p-value can also be provided.

Explain, givingtwodistinct reasons, why it is preferable to report a 95% confidence interval for the estimated treatment effect rather than only reporting the p-value.