Perceived stress
To our knowledge, this study was one of the first to demonstrate the stress-reducing effects of a mobile app based on stress inoculation training (SIT) in a universal sample of Chinese school adolescents. The results showed that the use of the Coping Camp significantly reduced the perceived stress level both at post-intervention and 19-week follow-up. The effect sizes were Cohen’s d = 0.15 at post-intervention and 0.18 at 19-week follow-up. The effect sizes were small as compared with previous online interventions among adolescents and young adults [