However, the impact of mild-to-moderate disorders on individuals and on society is significant. It is probable that given the greater prevalence of mild-to-moderate disorders, their detrimental effects outweigh those of the most severe disorders in terms of the overall disability burden for society (OECD, 2012, Kessler et al., Mild-to-moderate disorders also contribute to premature mortality, higher morbidity, and poorer outcomes for chronic diseases.