This study was motivated by mental health problems identified among students at MTsN 1 Agam Bukareh, Tilatang Kamang District, including self-harming behavior, withdrawal at school, and a tendency to isolate themselves due to students' inability to cope with the problems they experienced. This study aimed to determine the mindfulness index, mental health index, and the effect of mindfulness on students' mental health. The study employed a quantitative approach with a correlational associative design. The population consisted of 145 eighth-grade students, with a sample of 36 students selected using proportional random sampling. Data were collected through a Likert-scale questionnaire and analyzed using simple linear regression with the assistance of SPSS. The results showed that students' level of mindfulness was in the moderate category (66.7%), while their mental health condition was also in the moderate category (66.7%). The regression analysis resulted in a constant value of 7.098 and a mindfulness regression coefficient of 0.788, with a calculated t-value of 5.341 > the t-table value of 1.691 and a significance value of 0.000 < 0.05. These results indicate that mindfulness has a positive and significant effect on students' mental health. The coefficient of determination (R Square) of 0.456 indicates that mindfulness contributes 45.6% to students' mental health, while the remaining 54.4% is influenced by other factors outside this study.
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