Somebody probably broke their leg next door behind just a curtain, and only 70% of the study subjects would go help? And only 7% would help if another person is in the room and the other person doesn't go? Is anyone else very surprised by how low these numbers are? I would have expected something like 95% and 50%.

I'm going to guess that it would vary not insignificantly depending on what the person pretending to break their leg looked like.