According to Altman Weil, the answer is yes. Of course, one should be very wary of studies like these. There are a lot of factors that are taken into consideration when corporations set salaries for attorneys. I wrote an article about this a few years ago. My data is a little dated, but the general parameters are still applicable.
The actual study (which accounts for regional differences) is quite pricey. You might want to check with your law school career services office or law library to see if they have a copy (or might be willing to buy one.)