What percentage of north american adults may be functioning below their potential due to prolonged exposure to stress?

The percentage of North American adults may be functioning below their potential due to prolonged exposure to stress is about 15 - 20 % adults. When stress strikes, it will make your blood pressure higher compared to your blood pressure. It leads to increase heart rate and the supply of oxygen to your brain reduces. Thus, this will heavily affect your decision making, which make you perform below your full potential