I don't believe this is a question than can be settled 'by looking at the data' ... it's likely that this is an unknowable. My earlier point was: given that you can sometimes get actionable intelligence from prisoners by torturing them, posturing that you can't is a silly exercise. I'll repeat myself: this is the essence of the 'one percent solution' ... it does not matter how much, how often, how accurate: it does, sometimes, produce the desired result. The only position to take, therefore, is that it does not matter what results it does or doesn't produce: it is unacceptable. This is exactly what General Petraeus has done.
When a guy like John McCain even says that he doesn't support binding the CIA to standards established by the Army, fuzzy math isn't going to cut it.
/jordan