Fatigue is often detected from people ages 40-49 according to statistics from the Public Education survey. The study was sponsored by Prohealth in an attempt to diagnose what is really the current status of the ME/CFS situation all around the United States. The study is spearheaded by Lili Chu, MD. She said that the information they have gathered in the form of statistics is the missing point they have been looking for in research literature. According to the same study conducted, stress and anxiety is more common among middle class individuals because they tend to over exert themselves in unrealistic time patterns.