Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
Relative Risk Reduction (RRR %), Absolute Risk Reduction (ARR %) and corresponding Number Needed to Treat (NNT) for vertebral fractures in patients attending the FLEX trial (9), extension of the FIT trial (6).
