Reading in the correct way the SERP CTR data

[ducnt]

Hello Warriors,
when we read the yearly "ctr serp" data from MOZ ( example : moz.com/blog/google-organic-click-through-rates-in-2014 ) it says that "85% of the clicks go under the ads and the remaining 15% on the ads).

Then it also says that the first position gets 31% of the clicks, the second 14% and the third 9.85%.

When it refers to the "31%" does it refers to the 31% of the 85% clicking under the ads or the 31% of the total volume of the search?

And another things, the 4th position would be the one under the 3map pack (if it's available), correct?


Thank you in advance for the answers,
Andrea