70% of stress American Psychological Association 2011 53 percent of Americans American Psychological Association, The Impact of Stress American Psychological Association studies 53 percent of Americans reported personal health problems According to the American Psychological Association American Psychological Association, The Impact of Stress a result of stress In 2011, American Psychological Association, The Impact of Stress 42 percent of Americans cite stress-related irritability American Physiological Association an American Psychological Association study, American Psychological Association 2011 American Psychological Association, The Impact of Stress American Psychological Association, The Impact of Stress American Psychological Association American Psychological Association