The United States Supreme Court is back in session, and this term it will rule on a number of important issues, including partisan gerrymandering of election districts. While it's impossible to predict which way the decisions will go, one thing can be said with near-certainty: Female attorneys arguing before the justices will be treated less deferentially than their male counterparts.

In a recently published study, University of Alabama scholars Dana Patton and Joseph Smith analyzed the transcripts of 3,583 oral arguments presented to the court over more than three decades. They found "female lawyers are interrupted earlier and more often, allowed to speak for less time between interruptions, and subjected to more and longer speeches by the justices compared to male lawyers."

Their study, published in the Journal of Law and Courts, provides evidence that deep-seated gender bias infects even a top-level government institution that is rigorously committed to equal treatment.

The researchers analyzed written transcripts of all Supreme Court oral arguments from 1979 through the end of the 2013 term. It found 10.9 percent of the attorneys making these (usually 30-minute) presentations were women — a figure that increased to 14.2 percent after the 2000 term.

"Men were allowed an average of 225 words before the first interruption (by a justice), compared to 192 words for women," they report. "Male lawyers spoke an average of about 95 words between interruptions, compared to 83 words for female lawyers."

"Justices' interruptions are both longer and more frequent during presentations by female lawyers," the researchers add. "Justices interrupted women an average of 51.3 times, compared to 49.2 times for men."

Could this be explained by the fact that female lawyers represent different kinds of clients? To control for that possibility, Patton and Smith compared the experiences of men and women lawyers representing the U.S. Office of the Solicitor General. They found that, compared to their male counterparts, women representing the solicitor general's office "are allowed fewer words at the beginnings of and during their presentations, and they endure longer and more frequent interruptions."

OK, but is it possible that women are more likely to represent underdogs — perhaps ones with weaker cases that are more prone to challenge? Perhaps, but the researchers found it doesn't matter. "Female lawyers do not enjoy the well-documented positive effect of being on the winning side of a case," they write. "While male lawyers are treated substantially more deferentially when they represent the winning side of a case, female lawyers enjoy no such benefit."

Somewhat surprisingly, "the increasing number of female justices on the court does not seem to have mitigated the disparate treatment of female lawyers," the researchers add. The only element that tempers this tendency is "when the legal dispute concerns a gender-related issue." In such cases, they found female attorneys are not disadvantaged, presumably because issues of sex and bias are front and center in the justices' minds.

Patton and Smith argue that their findings have implications that go far beyond the Supreme Court. If women professionals are treated unfairly "in a place one would least likely to expect it," they write, "men likely receive more deferential treatment from bosses and coworkers in all manner of workplaces compared to their female counterparts."

Perhaps professional women are at an inherent disadvantage, no matter if the authority figure they answer to is wearing an expensive suit, or a judicial robe.

This story originally appeared as "Female lawyers are interrupted more frequently" on Pacific Standard, an editorial partner site. Subscribe to the magazine's newsletter and follow Pacific Standard on Twitter to support journalism in the public interest.