You're confusing the reporting of science with science. The news article contains what (the media think) the public would want to know of the results. The act

You're confusing the reporting of science with science. The news article contains what (the media think) the public would want to know of the results. The actual study (I'm not sure I can find it, but it appears to be a follow on from: http://www.medscape.com/viewarticle/497802 http://www.medscape.com/viewarticle/497802 ) will use scientific methods to work out why this is true, not just that it is true.