PhD defence Suzanne van der Toren

This thesis aimed to contribute to promoting physical, mental, and social well-being of adolescents and young adults. In the first part of this thesis, there is a focus on evaluation and analysis of health and quality of life, of self-sufficient daily functioning and of the recreational use of nitrous oxide (i.e. laughing gas) as a risk behavior. In the second part of this thesis, there is a focus on evaluation and analysis of health promotion in the form of intervention evaluation and analysis of help-seeking behavior.