From the LA Times:
Women may make up 51% of the population, but actresses nabbed only 29.9% of the 4,379 speaking parts in the 100 top-grossing films of 2007, or so says a new study released by University of Southern California’s Annenberg School for Communication & Journalism, which was conducted by professor Stacy. L Smith.
According to Smith’s study, 83% of all directors, writers, and producers on those films were male. Not surprisingly, the number of female characters grew dramatically when a woman directed a film — up to 44.6% from 29.3% if a man was behind the camera.