Pay equity refers to equal pay for equal work regardless of gender. Historically, symbols represented gender roles where women were depicted as staying home and men working. However, during World War 1, women left home to work in military plants as active men fought in the war. After the war, women remained active workers but a pay inequity emerged between men and women's wages. A pay equity process evaluates jobs based on skills, effort, responsibility, and working conditions to determine if jobs of comparable value, typically held by different genders, should receive equal pay. In 2010, women on average earned 77% of what men earned annually for full-time, year-round work, with some ethnic groups of women earning even less.