Nearly 40 percent of women who earn quit the profession or never enter the field, according to a recent study.

Researchers found that while women accounted for more than 20 percent of engineering school graduates over the past two decades, only 11 percent of practicing engineers and 9 percent of electronic and environmental engineers are women. They also discovered that poor workplace climates and mistreatment by managers and co-workers are common reasons many women leave the industry.

"These findings are likely to apply to women working in fields where there are less than 30 percent women. These women are more vulnerable to being pushed out because they typically aren't in the internal 'good old boys' network," researcher Nadya Fouad said in a statement. "This may not apply to women working in other professions, but the findings do apply to management practices in all fields in terms of the importance of providing opportunities for training and advancement as well as encouraging a healthy work-life balance."

For the study, researchers analyzed findings from the first phase of a three-year National Science Foundation study that surveyed more than 5,000 engineering alumnae spanning six decades, mostly from the 30 universities with the highest number of women engineering graduates and from 200 other universities

They found that while 62 percent of the women surveyed persisted in their careers as engineers, 11 percent never entered the field, 21 percent left more than five years ago, and 6 percent left less than five years ago. Among women who left less than five years ago, two-thirds said they pursued better opportunities in other fields while a third stayed home with children because companies didn't accommodate work-life concerns, Fouad said. Among those who went to other industries, 54 percent became executives, 22 percent were in management and 24 percent worked as staff members.

Women currently working as engineers and those who left less than five years ago showed no differences in confidence to perform engineering tasks, manage multiple life roles or navigate organizational politics, nor did they show differences in vocational interests, the study found.

Women who left engineering more than five years ago said their decision was due to caregiving responsibilities (17 percent), no opportunities for advancement (12 percent) and lost interest in engineering (12 percent). More than two-thirds continued working and among those, 55 percent were executives, 15 percent were managers and 30 percent were staff members.

Women who persisted in their engineering careers worked on average 44 hours a week and earned salaries between $76,000 and $125,000 a year. About 15 percent were executives, a third project managers and the remainder staff members. Supportive bosses and co-workers, and organizations that recognize their contributions, provide training and paths for advancement and support a work-life balance were reasons women gave for staying in their jobs, according to the study.

"Current women engineers become a flight risk when they experience a career plateau with few advancement opportunities, poor treatment by managers and co-workers and a culture that stresses taking work home or working on weekends with no support for managing multiple life roles," Fouad said.

Fouad said that for organizations to retain women engineers, they first need to realize that it is not a 'women's issue' to want to spend time with their children.

The findings were recently presented at the American Psychological Association's 122nd Annual Convention.