This was later amended in the translation given by the Roman philosopher Seneca the Younger in which euthymia means a state of internal calm and contentment.
[2] In 1958, Marie Jahoda gave a modern clinical definition of mental health in the terms of positive symptoms by outlining the criteria for mental health: "autonomy (regulation of behavior from within), environmental mastery, satisfactory interactions with other people and the milieu, the individual’s style and degree of growth, development or self-actualization, the attitudes of an individual toward his/her own self".
This turns out to be insufficient: patients considered to be in remission, i.e. not displaying symptoms meeting the threshold for diagnosis, still show impairments in psychological well-being compared to healthy subjects.
The 84-item scale includes facets of self-acceptance, positive relations with others, autonomy, environmental mastery, purpose in life, and personal growth.
[2] Garamoni et al (1991) described euthymia as having a balance between the positive and negative in six dimensions of cognition and affects similar to the Ryff factors.
While both achieved a significant reduction of symptoms, WBT provided more benefit in terms of observer rating and PWB scores.