But men enjoy a much wider variety of roles and are much more likely to play authority figures. Most female characters are skewed younger in age than their male counterparts, and they were also more likely to be identified by domestic roles such as wife, mother and girlfriend, the study found.
Black and Latina female roles also declined, though Asian female roles saw a slight increase in number. Some 11 per cent of female characters were black, 4 per cent were Latina, and 4 per cent were Asian.
Dr Martha Lauzen, the executive director of the Centre for the Study of Women in Television and Film, said: "The chronic under-representation of girls and women reveals a kind of arrested development in the mainstream film industry."
Reese Witherspoon said she set up her production company, Pacific Standard, to green-light more films with prominent female roles. She produced Gone Girl, which gave a leading role to Rosamund Pike, who now competes against Witherspoon, the star of Wild, for the Best Actress Oscar.
Dr Lauzen analysed 2300 characters appearing in the top-grossing US films of 2014. She made comparisons with findings from 2013, 2011 and 2002, for more than 9000 characters appearing in around 400 films.
A separate study conducted by Dr Lauzen found that just 17 per cent of powerful behind-the-scenes roles were held by women working on the top 250 grossing films of 2014.
- Independent