[Timeroot]

As a possible countereffect -- not one I necessarily believe to be stronger, but one to consider -- is that women might be weaker due to the culture they're coming from. Plenty of males have been encouraged to play with computers from the age of 8 or 10, and so will have large amounts of [at least some kind of] experience coming in to the workforce. Women are far less likely to have had this experience. Additionally, males (who will have more male friends) will quite possibly have plenty of coder friends whom they have learned from. Females statistically will have less, and have less exposure this way.

i.e. the culture not only makes it harder for women to get through learning compsci, but they'll also have less exposure to it in the process. This could potentially make them weaker candidates.

I don't know to what degree that actually happens.