This dissertation investigates the relationship between victimization and its impacts on mental health, physical health, and biological aging. Using data from the Netherlands Twin Register (NTR) and the Co-Twin Control Design (CTCD), the research disentangles the effects of victimization from genetic and shared environmental factors, offering a clearer understanding of its consequences.

Background: People compare their current well-being to different comparison standards (e.g. social or temporal comparisons). These standards are considered as aversive if perceived as threatening to self-motives or appetitive if perceived as consistent with self-motives. However, it remains unknown whether the congruence (vs. incongruence) of aversive and appetitive well-being comparisons (high levels of both vs.

Background: Somatic symptoms, such as chronic pain, fatigue, and gastrointestinal disturbances, are commonly reported in individuals with a history of childhood maltreatment (CM), which includes various forms of abuse and neglect experienced before age 18. Although CM is strongly associated with somatic symptoms, the specific relationships between CM subtypes and these symptoms, as well as the mechanisms connecting them, remain insufficiently understood.

Background: The coronavirus disease 2019 (COVID-19) pandemic was associated with an increase in mortality rates globally. Given the high numbers of deaths and the potentially traumatic characteristics of COVID-19 deaths, it was expected that grief-related distress would be higher in COVID-19 bereaved (compared to non-COVID-19 bereaved) people. This systematic review investigates the empirical evidence regarding this claim.