**H3**: *Overqualification will mainly discriminate employees with the unsatisfied-healthy pattern from the rest of the patterns*.

We test our hypotheses in a sample composed of young employees born between 1980 and 2000, typically called Millennials [30]. Knowledge about individual key outcomes such as wellbeing and health in young employees is still limited and deserves the attention of researchers and practitioners [31]. At the same time, there are approximately 1.8 billion millennials around the world. In 2018, they represent nearly 50% of the global workforce [32]. Therefore, improving outcomes for youth is fundamental to building more inclusive and sustainable societies [33], and one way to this is by promoting full and productive employment and decent work for all [ ... ] including young people [ ... ], which is part of the global agenda of the Sustainable Development Goals [34]. Figure 1 summarizes the four wellbeing patterns resulting from job satisfaction and mental health and the five antecedents we are considering.

**Figure 1.** Research Model.

#### **2. Materials and Methods**

## *2.1. Study Design and Procedure*

Data were collected from a survey on the transition of young employees to the labor market, which is part of the Valencian Institute of Economic Research (IVIE in Spanish). The survey was designed to facilitate the socioeconomic and psychosocial analysis of young employees' transition to the labor market. Participants between 16 and 30 years old who had been looking for or had found a job in the past 5 years were randomly selected for this study and then contacted by telephone. After two attempted contacts, the researchers replaced non-respondents with a randomly chosen substitute of the same age and gender. Considering the aims of this study, we focused only on respondents who were currently employed. Employees contacted by telephone were always informed of the purpose of

the study and assured of the confidentiality of the data. Those who gave their consent to take part in the research were interviewed in their homes using a structured face-to-face procedure.
