Well, while the study mentioned only used a sample of 900, statistically for the general population the more intelligent (as measured by I.Q.) a woman is the less likely she is to marry. Additionally and even more statisically verified is that the more education a woman has the less likely she is to be married. This does not hold true for men. The higher the I.Q. the more formally education the greater the chance that they will marry.

Not to man bash or woman bash possible explantions
1. Men are less likely to marry smart educated women
2. Women who are intelligent and education are less likely to choose to marry.
3.   It is a combination of choice and opportunity.