For this report Bickel and her colleagues pulled together four years of data on the representation of women, whether M.D.s, Ph.D.s, or both, on medical school faculties. The data come from medical schools, interviews with medical school department chairs, and other sources. An analysis of medical school faculty from 1979 to 1993 found that while 36 percent of men on the tenure track—that is, assistant professors for at least two years—were promoted to associate professor, only 24 percent of women were.