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Acta Psychiatr Scand ; 136(6): 571-582, 2017 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-28722128

RESUMEN

OBJECTIVE: To confirm prior findings that the larger the maximum monthly increase in solar insolation in springtime, the younger the age of onset of bipolar disorder. METHOD: Data were collected from 5536 patients at 50 sites in 32 countries on six continents. Onset occurred at 456 locations in 57 countries. Variables included solar insolation, birth-cohort, family history, polarity of first episode and country physician density. RESULTS: There was a significant, inverse association between the maximum monthly increase in solar insolation at the onset location, and the age of onset. This effect was reduced in those without a family history of mood disorders and with a first episode of mania rather than depression. The maximum monthly increase occurred in springtime. The youngest birth-cohort had the youngest age of onset. All prior relationships were confirmed using both the entire sample, and only the youngest birth-cohort (all estimated coefficients P < 0.001). CONCLUSION: A large increase in springtime solar insolation may impact the onset of bipolar disorder, especially with a family history of mood disorders. Recent societal changes that affect light exposure (LED lighting, mobile devices backlit with LEDs) may influence adaptability to a springtime circadian challenge.


Asunto(s)
Trastorno Bipolar/epidemiología , Radiación Electromagnética , Internacionalidad , Estaciones del Año , Adolescente , Adulto , África/epidemiología , Edad de Inicio , Asia/epidemiología , Australia/epidemiología , Europa (Continente)/epidemiología , Femenino , Humanos , Masculino , Persona de Mediana Edad , América del Norte/epidemiología , Sistema Solar , América del Sur/epidemiología , Luz Solar , Adulto Joven
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