Affective Temperament and Seasonality in Bipolar Disorder

Both affective temperaments and seasonality impact on the illness course in bipolar disorder (BD). This exploratory study aims to investigate the link between seasonality and affective temperament in BD.

Sixty-six euthymic patients with BD-I were recruited. The Seasonal Pattern Assessment Questionnaire (SPAQ) and Temperament Evaluation Memphis, Pisa, Paris and San Diego-Autoquestionnaire version scale (TEMPS-A) were applied.

The seasonal BD rate was 39.4% (n=26). Depressive and anxious temperament scores were higher in patients with seasonality. The SPAQ total scores were also associated with depressive, cyclothymic, and anxious affective temperament scores.

Our findings warrant further investigation to understanding the complex interaction between seasonality, mood regulation, and temperament collectively moderating illness course in BD. This study implies that affective temperament may have some value in discerning the link between seasonality and illness course in BD.