Agreed, but it does sound like she was pretty careful in which factors in the experiment were allowed to vary, and unless she's exaggerating the numbers (which

Agreed, but it does sound like she was pretty careful in which factors in the experiment were allowed to vary, and unless she's exaggerating the numbers (which is hard to do when you enumerate specifics), that's a pretty significant change. I would be more sceptical if someone pointed out factors that might have varied anyway. edit: The comment about 'profile freshness' is intriguing, and possible an example of this.