The aim of the present study was to examine the effects of a 6-week mindfulness training program on mental health, anxiety, depression, aggression, sleep quality, mood states, total mood disturbance, and perceived stress among male Chinese prisoners, and to explore whether the intervention effects differed in long-term and short-term prisoners. Eighty-three male prisoners completed the study, including 39 in the mindfulness training group and 44 in the waitlist control group. Results showed that, compared with the waitlist control group, mindfulness training group showed a significant improvement in mindfulness level ( p < .0l), Symptom Checklist-90 (SCL-90; p < .00l), aggression ( p < .05), sleep quality ( p < .05), and total mood disturbance ( p < .0l). Moreover, compared with the short-term prisoners, mindfulness training was more effective on the long-term prisoners in mindfulness level ( p < .05), SCL-90 ( p < .001), anxiety ( p < .05), depression ( p < .05), aggression ( p < .05), total mood disturbance ( p < .0l), and perceived stress ( p < .0l). Given the study’s innovation, we discussed its significance and limitations.

Previous studies suggest that prisoners are more likely to suffer from psychological problems, especially long-term ones. This, in turn, can cause severe behavioral problems such as self-harm and suicide. Previous research demonstrates that mindfulness-based intervention statistically contributes to improved emotional health in general terms. However, little is known about what specific aspects of mental health are improved. The purpose of the present study is to examine the effects of a 6-week mindfulness training program to the mental health of long-term male Chinese prisoners who were imprisoned for serious criminal behaviors and their prison sentences remain at least 10 years. Forty long-term male prisoners completed the entire study, with 19 in the mindfulness training group and 21 in the waitlist control group. Both groups completed self-report inventories before and after the 6-week intervention. Results show that the training group had significant improvement in mindfulness level (p < .0l), score of SCL-90 (p < .001) and perceived stress (p < .05) compared to the waitlist control group. With respect to the results, we discuss the significance and limitations of this study. Overall, the study provides evidence that mindfulness-based intervention can enhance the mindfulness level and mental health of long-term male prisoners.