A new case for gender diversity might be catching companies' ears –– it points to profits.
A recent study found net profit margins were up to 6 percent higher for companies where women made up at least 30 percent of leaders compared to companies with no women leaders.
One-third of the roughly 22,000 companies in the sample had no women on either their boards or as chief officers. Less than 5 percent of the companies had a female CEO.
Statistically, higher profits weren't strongly linked to having a female CEO or board members but having more women in leadership positions, in general, was.
Since the study is correlational, it's still unclear if the women caused the higher profits or if higher profits led to more women being promoted to leadership positions.
Click through some notable female CEO's:
Notable Women CEO's
More leadership roles for women may boost companies' profits
(Photo by Essdras M Suarez/The Boston Globe via Getty Images)
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Ursula M. Burns
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Beth Mooney, chief executive officer of KeyCorp, speaks during an interview in New York, U.S., on Thursday, Dec. 6, 2012. KeyCorp, which has 1,059 branches, is targeting $150 million to $200 million of expense reductions by December 2013, the Cleveland-based lender said in a statement. Photographer: Scott Eells/Bloomberg via Getty Images
Heather Bresch, chief operating officer of Mylan Pharmacueticals, sits in her office April 8, 2008, in Canonsburg, Pa., decorated mostly with artwork from her children's school activities. Bresch talked with The Associated Press about the controversy over her executive MBA from West Virginia University. (AP Photo/Dale Sparks)
Lynn Good, president and chief executive officer of Duke Energy Corp., listens during an interview in New York, U.S., on Wednesday, Sept. 28, 2016. Duke is moving to a lower carbon future regardless of who is in the White House, Good said. Photographer: Cassi Alexandra/Bloomberg via Getty Images
Debra Cafaro, chairman, chief executive officer of Ventas Inc., speaks during an interview in Chicago, U.S., on Wednesday, Aug. 25, 2010. Ventas, the second-biggest U.S. health-care real estate investment trust by market value, agreed to buy Nationwide Health Properties Inc. for about $5.7 billion. Cafaro will lead the combined company. Photographer: Tim Boyle/Bloomberg via Getty Images
Gracia Martore, President and CEO, Gannett Co. Inc., speaks at the UBS 40th Annual Global Media and Communications Conference in New York, December 5, 2012. REUTERS/Carlo Allegri (UNITED STATES - Tags: BUSINESS)
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Out of the 91 countries whose companies were included in the study, the top 10 economies offered 11 times more paternity leave days than the 10 worst performing economies. Paternity leave also correlated with more female board members.
The researchers argue more paternity days leads men to take a more equal share of childcare responsibilities. This, in turn, gives women more chances to work and be promoted to leadership positions.