Sales of "Doctor Who" merchandise are about evenly split between men and women, Zimmerman said.

The film cost $23 million to make, and drew an opening weekend crowd that was evenly split between men and women.

His research shows that while cardio machine usage is equally split between men and women, only 7% of free-weight users are female.

Toyota says Prius buyers are equally split between men and women with a median income between $60,000 and $80,000.