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Ive no idea how accurate it is but it makes broad sense. However clickthrough rates are surely likely to vary significantly depending on the relevance of the titles used and the adwords showing.
Personally Id always prefer to rank #3 with a nice clean intersting title and credible url than #1 with a spammy repetetive title and a url with 4 hyphens in it, so overall the position on the page is not that critical to me.