Those means different things. Their wording means "we checked X sites and 77% of them met some criteria", which can be extrapolated to higher values of X (assu

Those means different things. Their wording means "we checked X sites and 77% of them met some criteria", which can be extrapolated to higher values of X (assuming the proper statistical care is taken, etc). Your wording implies the same, but that's not good because you can't extrapolate to a larger X. You chose the sites after knowing they already met the criteria, and that changes the meaning.