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The purpose of this research is to investigate the effectiveness of model for reducing sedentary behavior and screen-time behavior among Thai adolescents. A quasi-experimental study design is employed in 6 schools, 3 school are randomly as the experimental group, and another 3 schools are control group. The total number of sample students are 387 people; 195 were in the experimental group and 192 people were in the control group.
The results found that the effectiveness of model can be used to motivate students to significantly reduce their sedentary behavior during their day when compared between the experimental and control groups (t = -3.525 ***). This is also found the statistic significant in the mean of sedentary behavior time comparing before and after activities (t = -8.990 ***). While considering the screen-time behavior, even though the model can reduce the cumulative duration of the screen-time behavior. The experimental group had lower screen-time duration than the control group. There was no, however, statistically significant difference between experimental and control groups. (t = -1.240).
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