"To find the answers, Dr. Byrne and Dr. Barling surveyed more than 200 high-achieving businesswomen in Canada in heterosexual marriages or common-law relationships."

Well, SOME of the answers.  Maybe.  The other "answers" may have been those of the group NOT surveyed: their husbands.  Typical oversight, unfortunately (See the G&M's "Unfounded" series, for example.)

And there's this:  the writer says, "The conclusions are complex, though SUGGEST some clear patterns."  Well, if they only "suggest" then perhaps the patterns aren't all that clear, after all.  Which negates the following phrase: "in fact" which negates what comes next: "And that, in turn, predicts ..." It's not necessarily a "fact" and so cannot "predict" anything with any certainty.  In short: nothing much is known for sure.

RE: Sandra Bullock.  As I recall, the marital break-up had nothing to do with her success--or his lack of it.  The simple fact was that (1) he was foolin' around and (2) she caught him out.