Maybe I missed something here, or they forgot to mention it due to language issues - but there doesn't even seem to be a control group. How can they draw any conclusions without a control group?
I have ordered a book, "Know Your Chances", which is supposed to be an understandable discussion and explanation of how to make sense of health-related statistics. I think everyone who pays any attention to research should have this basic understanding. If we rely on media headlines, or even many abstracts, we will be mis-informed.
http://www.amazon.com/Know-Your-Chan...4542365&sr=1-1
Man! tinyurl:
http://tinyurl.com/ckedls 
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