An MRCOG lesson on RCTs: Part B. In part A (please watch that video also!), we learnt about the quality features of an RCT. In this video, we learn about the common statistics we use in the reporting of RCTs. These include: Risk, Relative risk (or Risk Ratio, RR); Absolute risk difference (ARD); and Number Needed to Treat (NNT). We also look at what a Confidence Interval (CI) means. The statistics are illustrated with a simple numerical example. Enjoy!