Things may be better or worse. It would be intriguing to have a firm like Peopleclick Research Institute to do a pay equity analysis on the numbers http://www.peopleclick.com/solutions/pri.asp

PRI will analyze differences in current pay rates among employees performing the same jobs with similar levels of skill, effort and responsibility. In pay progression studies, PRI looks at differences in the rate at which employee pay progresses over time owing to merit pay increases, job promotions or job transfers.

TNA might recommend all companies do such analysis to ensure pay equity for women.