The bigger a study, the better? That’s an assumption often made. But even studies that knock us out by their sheer size may be wrong.

Too many clinical trials produce results that are statistically significant but clinically meaningless, according to two US cardiologists.

“Don’t have a Caesarean unless you must” said the headlines on stories about a new study from the World Health Organisation, published in The Lancet.

When authors of medical papers have no statistically significant results to report, what do they do? Resort to spin.