Making more sense with numbers, part 4
It's a somewhat long article, but you'll probably get the message by the end of the first example. (There is a possibly useful pointer to odds ratios and risk ratios on Wikipedia at the end of the article.) If you want another view on the same subject, see Odds ratios should be avoided when events are common, a letter by Douglas Altman, Jonathon Deeks, and David Sackett in BMJ. For an opposing view, see Stephen Senn's response.
If you're not writing for a highly technical audience and making it clear (perhaps through context) what you mean, I agree with the first and second articles.
Thanks to Jeremy Miles for the pointer.
Those curious about the title of this posting can read part 3 and find earlier parts.