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The reason for the control group being so small is that it is difficult to find adults who have received no vaccines during the course of their life.
The "control group" numbers about 200, while the vaccinated group is several orders of magnitude larger. They cannot guarantee consistent results, i.e., if they took a new control group of different people, will they have the same result? Sample sizes approaching several thousand individuals generally yield (as long as valid statistical sampling methods are employed) a highly consistent result, so long as we are measuring physical (and consequentially ergodic) phenomena and processes.
https://www.thecontrolgroup.org/gallery