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To investigate the moderating role of physical activity (PA) in the association between leisure-time sedentary behavior (LT-SB) and non-suicidal self-injurious behaviors (NSSI) among secondary vocational students in Guizhou Province, and to determine its significant value for providing a scientific basis for the prevention and intervention of NSSI among this group.
Students from a total of nine secondary schools in Guizhou Province were selected for a self-administered questionnaire survey through a multi-stage stratified whole cluster random sampling method from October to December 2023, and multiple linear regression was used to analyse the moderating effect of different types of PA on the association between LT-SB and NSSI among secondary students and to determine the critical value of the moderating effect by using Johnson-Neumann techniques (J-N techniques).
The detection rate of NSSI among secondary vocational students in Guizhou Province was 27.5%, with male and female students' rates at 14.2% and 13.3%, respectively. Multiple linear regression showed that the interaction term coefficients of total PA, light physical activity (LPA), moderate physical activity (MPA), and vigorous physical activity (VPA) with LT-SB were -0.255, -0.220, -0.472, and -0.424 (P < 0.001), respectively, with MPA having the largest moderating effect. The J-N technique indicated that the association between LT-SB and NSSI weakened as the duration of PA increased, with critical values of 2.39 hours for total PA, 1.63 hours for LPA, 0.99 hours for MPA, and 1.11 hours for VPA.
When developing an exercise intervention to prevent NSSI behavior in secondary vocational students, approximately 1 hour of MPA per day may be the most appropriate and efficient option.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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