However, the mean scores, of both the experimental and control group’s PSE, at the 12th week were lower than at baseline. Therefore, the intervention program did not increase their PSE scores from baseline at 8 or 12 weeks. The reason for this may be that the participants did not receive information regarding physical activity after the termination of the intervention program. Thus, their self-efficacy belief was not boosted, or enhanced, by the researcher, the research assistant or the social support from their family and peers. Such findings are consistent with the of Lubans and Sylva.30 In contrast, Kuysuwan’s quasi-experimental research31 found that students, aged ten to 12 years, in his experimental group, had significantly higher perceived self-efficacy and practice in weight control than those of his control group at the fourth and eighth weeks. This may have been because that their parents continued to encourage and support the students after they finished the program. Thus, the results of this study imply that a method to booster the adolescents’ PSE needs to be incorporated in the program.
Figure 3 Comparison of the mean physical activity scores over time
Baseline 8th week 12th week Time
Physical