Randomised clinical trials (RCTs) remain the gold standard in evaluating therapeutic interventions, ensuring that treatment effects are not confounded by systematic errors. Central to these trials is ...

Anyone who’s read my stuff with any regularity is acutely aware of my disdain for the way many observational studies are conducted and interpreted in health and nutrition research, as well as my ...

This is a preview. Log in through your library . Journal Information The BMJ is an international peer reviewed medical journal and a fully "online first" publication. Our publishing model–"continuous ...