The purpose of this study was to investigate the relationship between the lifestyle and mental health of male high school and university students. By means of questionaire, samples of lifestyle and KMI (Kyudai Medical Index) were obtained from 5 groups: 64 high school students, 196 university freshmen living with family, 183 freshmen living alone, 62 sophomores living with family, and 46 sophomores living alone. The results were as follows:
1. The total scores of KMI are those of high school students, sophomores living with family, freshmen living with family, freshmen living alone, and sophomores living alone respectively in order, from high to low score.
2. Whether students lived with family or alone, it affected their physical and mental health. Though the progress of grade did not affect their mental health, it affected their physical health.
3. The progress of grade and living form had little concern with the habit regularity.
4. The level of mental health based on KMI was independent of students' lifestyle, but largely depended on their trouble, stress, adaptability to the university life.
