Yeah, what worked in the trials was that no one got diarrhea during that time. So, the "most effective" dose becomes the one that requires taking the most number of pills before causing such an unpleasant side effect.
This is very interesting research, thanks very much for posting.
You may be onto something here...
There is no reason for that "unpleasant side effect" to EVER happen. The reason antibiotics cause diarrhea is that they kill off the beneficial gastrointestinal tract flora as well as the bothersome bacteria. Which means your GI tract simply doesn't work (or as well). EVERY doctor who prescribes antibiotics should recommend that their patients either eat "active culture yogurt", or go down to the local health food store and buy a bottle of acidophius capsules.
If you take antibiotics long enough WITHOUT the acidophilus, you risk an explosive growth of candida-type fungi, which can REALLY do "bad things" to your body. It happened to me, and it literally took YEARS to fully recover.