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International audience; This study intends to analyze the influence that the health condition (with/without chronic condition (CC) and CC that affect/does not affect the school participation), the factors related to the school context (liking school, perception of school success, difficulties at school, relationship with peers and teachers) and the physical and psychological symptoms exert on the adolescents’ quality of life (QoL). This work is part of the HBSC 2018 study and relies on the participation of 8215 students (52,6% female), aged between 10 and 22 years old (M=14.36 and SD=2.28). The results show that the adolescents with CC have more physical and psychological symptoms and a lower perception of QoL. Having a CC that does not affect school participation is associated with a better QoL. The students with CC that affect school participation like school less than the students with CC that does not affect school participation, perceive a lower academic success and a lower QoL, have more difficulties at school and present more physical and psychological symptoms. Liking school, having a better relationship with teachers and peers, a higher perception of school success, fewer difficulties at school and fewer physical and psychological symptoms is associated with a better QoL. These results underline the importance of school participation regarding the adolescents’ well-being and QoL. More than having a CC, what causes a greater impact on the adolescents’ QoL is the fact that this condition affects the school participation which reinforces the importance of promoting and ensuring the school participation of the students with CC.

Obesity-related behaviors, such as intake of snacks and sweetened beverages (SSB), are assumed to result from the interplay between environmental factors and adolescents' ability to self-regulate their eating behaviors. The empirical evidence supporting this assumption is missing. This study investigated the relationships between perceptions of at-home and out-of-home food environment (including SSB accessibility, parental, and peers' social pressure to reduce intake of SSB), nutrition self-regulatory strategies (controlling temptations and suppression), and SSB intake. In particular, we hypothesized that these associations would differ across the stages of preadolescence, early and mid-adolescence. Self-reported data were collected from 2,764 adolescents (10-17 years old; 49 % girls) from 24 schools in the Netherlands, Poland, Portugal, and the United Kingdom. Path analysis indicated that direct associations between peers' social influence and SSB intake increased with age. Direct negative associations between at-home and out-of-home accessibility and SSB intake as well as direct positive associations between parental pressure and intake become significantly weaker with age. Accessibility was related negatively to self-regulation, whereas higher social pressure was associated with higher self-regulation. The effects of the environmental factors were mediated by self-regulation. Quantitative and qualitative differences in self-regulation were observed across the stages of adolescence. The associations between the use of self-regulatory strategies and lower SSB intake become significantly stronger with age. In preadolescence, SSB intake was regulated by means of strategies that aimed at direct actions toward tempting food. In contrast, early and mid-adolescents controlled their SSB intake by means of a combination of self-regulatory strategies focusing on direct actions toward tempting food and strategies focusing on changing the psychological meaning of tempting food.

Self rated health, in adult population, is strongly associated with mortality and life expectancy. In younger people this association is less evident, but it may anticipate a similar risk in adult life. Our research, based on the HBSC (Health Behaviour in School-Aged Children) International collaboration, contributes to deepen the knowledge in this field by monitoring adolescents' health through a multi-national survey involving 29 European countries, plus North America (Canada and USA) and Israel.Following an established methodology, the HBSC survey has elaborated a questionnaire on health and health behaviour, filled in by a representative national sample of 11-, 13- and 15-year-old boys and girls. The sample is constituted of more than 160,000 subjects interviewed during the 2001/2002 survey. Reported symptoms and self-rated health have been analysed by sex and age and through the different countries.Girls resulted to have a poorer perception of their health, with respect to males, at all ages and in all countries (Overall OR = 1.70, 95% CI: 1.66-1.76). Age increases this risk both for males and females, with an average increase of 32% (95% CI: 29-34%) per year in the age-range 11-15. The situation is similar for reported symptoms, with an overall OR of 1.81 (95% CI: 1.77-1.85) for females of reporting three or more symptoms at least once a week; also this risk increases of 26% (95% CI: 24-27%) per year during the pre-adolescence phase. In both cases it could be shown a significant interaction effect between age and gender: OR = 1.19 (CI: 1.15-1.23) for perceived health and OR = 1.26 (CI: 1.23-1.29) for reported symptoms in females with respect to males.Even if adolescence is described as the healthiest period of life, a consistent minority of young people perceive and report a poor health and a high number of symptoms. Females are constantly in a worse position than males and older age groups are worse than younger ones.