And it'll also include some number of alcoholics in recovery who are currently consuming no alcohol, but who's bodies have hard years on them, and you'd expect to do worse than overall population average in outcomes.
Yes, and any number of other things you hadn't thought of. The beauty of randomization is that, whatever it is, it will put some of those people in each group.
But even with a random variable, this still only gives you an average result for the group. And the more diverse the group is, the less likely that it's useful in predicting whether it works for you.
But even with a random variable, this still only gives you an average result for the group. And the more diverse the group is, the less likely that it's useful in predicting whether it works for you.