Euthymia scale as a protective factor for depressive symptoms: a one-year follow-up longitudinal study

Area of Science:

• Psychiatry
• Mental Health Research
• Epidemiology

Background:

• Depressive symptoms pose a significant public health challenge.
• Predictive markers for depressive symptom incidence are crucial for early intervention.
• Euthymia, a state of emotional balance, has been explored for its potential protective role.

Purpose of the Study:

• To investigate if a high score on the euthymia scale (ES) predicts a lower incidence of depressive symptoms one year later.
• To assess the predictive value of baseline euthymia for future depressive symptom development.

Main Methods:

• A longitudinal online survey study involving 624 Japanese adults aged 20+.
• Baseline euthymia measured using the Japanese version of the 10-item ES.
• Depressive symptoms (feelings of depression or anhedonia) assessed at one-year follow-up.
• Multivariate logistic regression adjusted for relevant covariates.

Main Results:

• 10.1% of participants developed depressive symptoms at follow-up.
• A high ES score at baseline significantly predicted a lower incidence of depressive symptoms (aOR=0.81).
• A cutoff score of 7 or more on the ES further indicated a reduced likelihood of developing depressive symptoms (aOR=0.46).

Conclusions:

• The euthymia scale demonstrates predictive utility for identifying individuals at lower risk of subsequent depressive symptoms.
• Findings suggest euthymia may serve as a valuable indicator in mental health screening.
• Further research with rigorous diagnostic criteria is recommended to confirm these findings.