One figure truly startled me when I read it. Seems when a researcher checked the torque on various cranksets & bottom-brackets, the majority of them put on by people without a torque-wrench read at 1/3rd to 1/2 the recommended torque-settings from the manufacturer.

I found this figure alarming. Perhaps this explains the high number of people asking for help with clicks, creaks, clunks etc. emanating from the bottom-bracket area.