A questionnaire survey was conducted among 913 high school students in order to investigate the relationship between their life style (their health awareness and their exposure to IT equipment) and subjective symptoms, and tendency of depression. Results showed that life style of high school students is related to their subjective symptoms and tendency of depression. For better quality of life of high school students, it would be useful to give them concrete advice on how to build better life habits about keeping good sleep, optimal physical activities, regular meal and intestinal function, and appropriate use of mobile phones.
