It is incredibly easy to misrepresent fact by poor presentation of statistical results. The flip side of this is that it is incredibly easy to present statistics in a misleading way. If the information is important to you ALWAYS go back to the source. If the references aren't there DON'T trust it. If the references are there see who they come from. I'm sure you can find objective review papers in medical journals such as The Lancet, which are peer reviewed and only cite from legitimate, peer reviewed sources. These should sum up the available studies and provide a ligitimate answer to your questions, though the answer may be equivocal. At least you can trust the stats!