WASHINGTON (HealthDay News) -- Women still lag behind men in the field of scientific research, particularly in getting their work published in prestigious publications.

That's the finding of new research that shows while a greater number of women have become medical researchers over the last four decades, their studies are still much less likely to see the light of day in major medical journals.

"Women have come a very long way, but there's still a very long road ahead," concluded study author Dr. Reshma Jagsi, who conducted the research while at the Office of Women's Careers at Massachusetts General Hospital.

"The percentage of first authors who are women has gone up from 6 percent in 1970 to almost 30 percent in 2004, and that's quite an accomplishment," added Jagsi, who is now at the University of Michigan in Ann Arbor. "But that's still not parity

[with men], and that's what we all hope will someday be the case."

The issue of sexism within medicine and other sciences resurfaced early last year when then-Harvard University president Larry Summers gave a speech suggesting that women were somehow less well-equipped for the sciences than their male peers.

Just last week, in a rebuttal to Summer's remarks, transgendered Stanford University neuroscientist Ben Barres penned an essay in Nature, in which he said his career path got noticeably easier when he switched his sex from female to male.

In this latest study on the issue, Jagsi's team looked at articles published in the years 1970, 1980, 1990, 2000 and 2004 in six major U.S. medical journals: the New England Journal of Medicine, the Journal of the American Medical Association, the Annals of Internal Medicine, the Annals of Surgery, Obstetrics & Gynecology, and the Journal of Pediatrics.

Her group focused specifically on the two most prestigious names heading any given study: the "first" or "lead" researcher (always listed first in the list of authors), and the "senior" researcher (listed last, often a senior faculty member).

Jagsi's team found that the percentage of clearly female names listed as first study author rose from a paltry 5.9 percent overall in 1970, to 29.3 percent by 2004. The share of senior authors who were female also rose, from 3.7 percent in 1970 to 19.3 percent in 2004.

The team also looked at the names of experts who were asked to write guest editorials in the NEJM or JAMA over the past few decades.

Again, they found that the number of female commentators rose from zero (in JAMA) and 1.5 percent (in NEJM) in 1970 to between 18 percent and 20 percent by 2004.

According to Jagsi, these increases in numbers reflect the rising participation of women in medicine, generally. Recent data show that women hold one third of the faculty positions at American medical schools. However, the data also shows that only 10 percent of female faculty members have full, tenured professorships, compared to 28 percent of male faculty members.

Frequent publication in prestigious journals can make or break a researcher's career, Jagsi said. That's why increasing the profile of women in medical journals is key to bringing true equality to the profession.

However, research is time-consuming and typically peaks in the 30s and 40s, she added. That's also the point in many women's lives where they face the dilemma of choosing between children or career. "That means that women

[researchers] are most likely facing barriers even before they get to the point of submitting an article to a journal, or they are not taking those key senior or first-author roles," said Jagsi.

She believes that specific interventions on the part of medical schools -- such as increasing mentorship for young female researchers and finding creative ways to help free up their time -- would go a long way to boosting their publication rates.

"There's already quite an effort going on across the country at different medical centers to try and address those issues," noted Dr. Mary Beth Hamel, an assistant professor of medicine at Harvard and the co-author of a related NEJM editorial.

Hamel is also deputy editor at NEJM. She said the journal doesn't track the gender of authors it publishes, and study selection is made solely on the merits and importance of the science.