Normal, Italic, Bold, Bold Italic – which one do you click?

From the article:

    Normal – 44.5%
    Italic – 44.9%
    Bold – 45%
    Bold Italic – 43.8%

  [...]

  Whilst Bold did the best I’m not convinced that it’s 
  something that it worth investigating further with that
  page.

I feel like the author has a weak statistical background, which is unfortunate when running a site that is, essentially, all about applying statistical tests. The difference between Italic and Bold is basically indistinguishable without a sample size of a few hundred thousand.

Even telling Bold Italic and Bold apart reliably (i.e. lying outside each others approximate 95% confidence intervals) requires a sample size of more than 6000.

(Admittedly, my statistics isn't awesome, and it's late here.)

(Also, www.quicklytest.it and quicklytest.it are acting differently. Specifically, the former is saying "The requested URL <url> was not found on this server." for every request.)

This is a weird experiment to me because links (that's what 'which one do you click' means, right?) should be based on other factors besides their emphasis and weight, although ideally they're bolded simply to stand out from the rest of the copy. I'd knock the italics out of the running completely because of how sloppy they can render across operating systems, depending on the typeface and the user's ClearType settings.

I'm getting a database error at the moment.