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Women in California and across the country earn an average of 82 percent of what men make in the first 10 years after graduating from college, according to a new study from the National Association of Colleges and Employers.

Researchers found that a significant portion of this disparity is attributed to where people work - three-quarters of men are employed in the private sector, compared to only half of women.

Mary Gatta is the director of research and public policy at NACE.

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"The top industries where men were employed were manufacturing, finance, insurance, real estate, the fire industries, architecture, and engineering," said Gatta. "Women are in education, health care, social assistance, and professional and technical services. So women dominate more in lower-paid industries."

Advocates say school districts should introduce boys and girls to all types of occupations, and in particular, encourage girls to take classes in science, technology, engineering, and math.

California has tried to shrink the pay gap through public policy. Companies in the Golden State are prohibited from inquiring about a candidate's previous salary range during the hiring process.

They are also required to disclose salary ranges in job postings or upon request.

Gatta said colleges should offer robust career counseling to prepare students as they enter the workforce.

"We also need to think about salary negotiation," said Gatta, "and helping remove any concerns that recent college grads might have about negotiating, helping prepare students for salary negotiation."

She added that establishing a higher salary from the get-go pays dividends for many years.

Conversely, the pay gap persists as women progress in their careers, so they contribute less to Social Security and receive lower payments in retirement.

Support for this reporting was provided by Lumina Foundation.