The only proper conclusion that can be drawn from the data in this article is that women (collectively) earn less than men (collectively).  This data says nothing about unfair pay practices and you cannot draw any conclusions on this question.

There are good policy reasons to look at data such as this, either to gauge societal income dynamics, or to gauge fairness of pay, but we have to be very careful to infer that women are discriminated against in terms of income when all else is equal.  This study tries to break it down more, but even fails to go far enough.  For instance it reports 95% wage parity in "Health", but this doesn't account for the different roles in "health" and their pay.  For example, in a Dr. office with equal numbers of male/female doctors each paid the same, the "female average income" will be brought down if you factor in the predominately female lower paid support staff (they tend to be overwhelmingly female).