Most of these studies however, are conducted in high-income countries. Studies that focused both on physical activity and screen-time behaviour have shown a modest effect on screen-time behaviours. Interventions that aimed to improve either physical activity or screen-time have reported inconsistent or marginal effects on screen-time. School-based interventions have been developed to decrease screen-time and resulted in a significant but small decrease in screen-time among adolescents. In Latin-America this prevalence reaches levels higher than 50 %. Despite this, the prevalence of spending more than 2 h/day on screen-time behaviours among adolescents exceeds 30 % in most of the countries around the world. Adolescents who spend more than 2 h/day on screen-time behaviour (television (TV) viewing, computer use and video games playing) are more likely to have unfavourable body composition, low fitness and a decreased academic achievement.
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