Psychometric assessment of the Persian translation of the EPOCH measure among adolescent girls Azadeh Taheri 1 & Mahsima Pourshahriari 1 & Abbas Abdollahi 1 & Simin Hosseinian 1 # Springer Science+Business Media, LLC, part of Springer Nature 2020 Abstract The EPOCH measure was designed to assess well-being among Western adolescent populations. To this date, the psy- chometric properties of the EPOCH measure have not been assessed for its applicability to Iranian adolescents. The purpose of the current study is to first translate the EPOCH measure from the English language into the Persian language, and to subsequently examine the psychometric properties of the Persian version of the EPOCH measure among Iranian adolescent girls. A multi-stage cluster random sampling method was employed to select 373 girl high-school students (grades 11 and 12) from schools within District One of Tehran. The results of the face, content, and construct validity tests showed that the EPOCH measure had acceptable validity and suitable reliability (the composite reliability and the Cronbach’s alpha values were greater than 0.7). The results of confirmatory factor analysis supported the five factors of the EPOCH measure among Iranian girl high-school students. The overall results showed the validity and reliability of the EPOCH measure for assessing well-being in Iranian girl high-school students. Keywords EPOCH measure . Well-being . High-school . Girls Adolescence is a time of exposure to important changes in biological, physiological, and psychological aspects of life, and many adolescents may have difficulty adjusting to these changes (World Health Organization 2017). During this peri- od, a growing number of adolescents are at risk of mental health disorders, such as anxiety, depression, and stress (Abdollahi et al. 2015), while the risks are particularly more prominent in girls (Fox et al. 2010). Adolescents who experi- ence better levels of well-being are more likely to have a more effective psychological adjustment, and hence transition more smoothly and safely into adulthood (González-Carrasco et al. 2019). Therefore, there is a crucial need for a psychometric study to assess the well-being of adolescent girls in order to protect them against the mentioned risk factors. Well-being, in the terminology of research, is described as a composite of emotion and performance well across the dif- ferent aspects of life, with specific reference to subjective well-being ( hedonia ) and psychological well-being (eudaimonia; Diener et al. 2006; Ryan and Deci 2001). This definition of well-being is based on two philosophical tradi- tions named hedonism and eudaimonism (Diener 2000). According to Aristippus (third century BCE), hedonia means experiencing maximum pleasure and minimum pain or suffer- ing (Aristotle 1985). The hedonic view of well-being is com- parable with enjoyment, pleasure, and comfort (Ryan and Deci 2001). The concept of eudaimonia stems from the defi- nition of Aristotle (fourth century BCE) as thriving to reach one’s maximum and full potential (Aristotle 1985). The eudaimonic view equates well-being with the essential drive to pursue challenging goals, which are worthwhile for the person and the community (Ryan and Deci 2001;Stewart- Brown 2017). The distinct philosophies underpinning the def- initions of hedonism and eudaimonism may indeed help with understanding the concept of well-being. In fact, the new view in positive psychology attempts to integrate both traditional perspectives into a comprehensive definition for the concept of human well-being (Seligman 2011). The current study aims to measure the psychometric prop- erties of the Persian version of the EPOCH measure developed for assessing well-being in adolescents. EPOCH is a self- report measure based on Seligman’s PERMA theory, which incorporates measures of five positive characteristics, namely * Azadeh Taheri a.taheri@alzahra.ac.ir 1 Department of Counseling, Faculty of Education and Psychology, Alzahra University, Tehran, Iran Current Psychology https://doi.org/10.1007/s12144-020-01013-7