Despite many strides in workplace equality, the number of women reporting lower wages than their male co-workers remains roughly unchanged from two years ago, according to CareerBuilder.

In a recent survey of more than 7,900 workers, 34 percent of women said they believe they're still being paid less than men, compared to 35 percent in a similar survey conducted in 2006, the Chicago-based online job board reported. In fact, 40 percent of men who took part in the survey reported making $50,000 or more a year, compared to only 21 percent of women. By contrast, about half of the women workers surveyed said they made $35,000 or less, compared to 28 percent of men. Of total survey respondents, 4,300 were men and 3,600 were women.

About a quarter of participating women also said they had fewer career advancement opportunities, while others said they had fewer training and learning opportunities. Up to half said they perceived a general favoritism towards male workers, and a third said men were better at schmoozing with their supervisors.

The survey also found that women in the health-care, hospitality and education industries were less likely to report wage discrimination, compared to those in manufacturing, retail and professional and business services.