According to Gamasutra's Game Developer Salary Survey 2014, men working in the video games industry here in the United States made an average of $85,074 in 2013, while women in the same jobs made an average of $72,882. According to Gamasutra, women made 86 cents on every dollar that men made in the U.S. game industry.
While this is certainly an issue that needs to be addressed, the pay gap between men and women is less than the national average: in the U.S. overall, women make 77 cents on every dollar that men make, according figures from a 2012 Census Bureau survey.
Gamasutra posits that the mostly like reason for wage gaps between men and women on average is due to what is commonly referred to as "career interruption" due to women taking time off to take care of their families.
Harvard University labor professor Claudia Goldin said in a recent paper on the gender gap that it would be dramatically reduced if employers wanted it to be.
"The gender gap in pay would be considerably reduced and might vanish altogether if firms did not have an incentive to disproportionately reward individuals who labored long hours and worked particular hours."
You can check out Gamasutra's full survey results here in PDF format.