The maximum level mentioned or 450 volts.
The results of the Milgram experiment were rather surprising. Before Dr Milgram performed the experiment, he conducted an poll of fourteen senior-year psychology majors about how far the "teachers" would go during the experiment, the ones polled believed that only a few would use the maximum voltage (0 to 3, average of 1.6). An informal poll of his colleagues also indicated that very few would go all the way. Then he polled 40 psychiatrists from a medical school. And they believed that most subjects would quit by the 10th shock, less than 4% would give the 300 volt shock, and slightly over 0.1% would give the full 450 volt shock. But when Milgram actually performed the experiment, 26 out of 40 teachers (65%) gave the learner the full 450 volt shock.
