Though the physician wage gap between genders is virtually nonexistent in the private sector, that hasn't carried over to academia yet, where female academic physicians at public medical schools had lower average salaries than their male counterparts. Age, experience, medical specialty, faculty rank and other factors don't really account for it, according to an article published online by JAMA Internal Medicine

Anupam B. Jena, M.D., Ph.D., of Harvard Medical School, Boston, and coauthors analyzed salary information data for academic physicians at 24 public medical schools in 12 states using Freedom of Information laws. They combined that data with information on clinical and research productivity. The study included 10,241 physician faculty members, of whom 3,549 (34.7 percent) were women and 6,692 (65.3 percent) were men, a proportion comparable to that seen among other U.S. medical schools not included in the study.

In unadjusted analyses that did not account other mitigating factors, women had lower average salaries than men - $206,641 for women vs. $257,957 for men - with an absolute difference in salaries of $51,315, according to the results.

Women physicians in the study were less likely than men to be full professors, they tended to be younger and more women specialized in internal medicine, obstetrics and gynecology, and pediatrics. Woman also had fewer total publications, were less likely to have funding from the National Institutes of Health (NIH) and less likely to have conducted a clinical trial.

Still, factors including faculty rank, age, years since residency, specialty, NIH funding, clinical trial participation and publication count accounted for only a portion of the salary difference with a $19,878 difference remaining with average adjusted salaries of $227,783 for women and $247,661 for men.

Surgical specialties had the largest sex differences in salaries, while sex differences in salaries were present at all faculty ranks. For example, salaries for female full professors ($250,971) were comparable to those of male associate professors ($247,212), according to the results.

Study limitations included a lack of information on faculty track or part-time status. Also, reported incomes in some schools or states may exclude other payments to physicians and thus not reflect the full salary.

"Our use of publicly available state employee salary data highlights the importance of physician salary transparency to efforts to reduce the male-female earnings gap," the study concludes.

Citation: JAMA Intern Med. Published online July 11, 2016. doi:10.1001/jamainternmed.2016.3284.