title: How to guarantee finding a statistically significant difference: the use and abuse of subgroup analyses.
authors.affiliation: Institute of Applied Health Sciences, University of Aberdeen Medical School, Foresterhill, Aberdeen, AB25 2ZD, UK. P.Fayers@abdn.ac.uk
authors.forename: Peter M
authors.initials: PM
authors.lastname: Fayers
authors.forename: Madeleine T
authors.initials: MT
authors.lastname: King