October 05, 2004

Schizophrenia And Summer and Winter Births

Certain types of schizophrenia may be linked to summer birth

A psychiatry research journal published this week states that Patients with deficit schizophrenia, a subtype of schizophrenia characterized by "negative" symptoms, such as blunted speech and expression, lack of emotional response, and apathy, are more likely to have been born in the summer months.

According to the article, winter birth was reported to be a risk factor for schizophrenia in 1929. Clinical aspects of patients with schizophrenia born in the winter include paranoia and a more benign course of illness. Additionally, the clinical features associated with winter birth are different from patients with deficit schizophrenia, defined by the presence of negative symptoms, including inability to experience pleasure, lack of interest in socializing, speech deficits, blunted emotional response, poor eye contact, and more severe course of illness. Nondeficit schizophrenia is characterized by symptoms including hallucinations, incoherent thinking, and prominent delusions.

Patients with deficit schizophrenia, a subtype of schizophrenia characterized by "negative" symptoms, such as blunted speech and expression, lack of emotional response, and apathy, are more likely to have been born in the summer months, according to an article in the October issue of The Archives of General Psychiatry, one of the JAMA/Archives journals.

Erick Messias, M.D., M.P.H., of The Johns Hopkins University, Baltimore, Md., and colleagues analyzed published and unpublished data from the northern hemisphere on studies of season of birth with information on schizophrenia and its subtype- deficit or nondeficit. A total of 1,594 patients were included in the nine studies examined.

"This pooled analysis of data from six countries in the northern hemisphere showed a significant association between deficit schizophrenia and summer birth," write the authors. "Information on month of birth only, as opposed to day of birth, was available across studies, and our analyses found an increase in June/July. However, it is likely that a more seasonal pattern would have been apparent with more detailed information."

"Our results support the concept of a double dissociation in deficit vs. nondeficit schizophrenia and the risk factor of season of birth, with the deficit group associated with summer birth and the nondeficit group with winter birth. This difference strongly suggests differences in etiology between the two groups," the researchers write.

"Seasonal variations in infectious agents, sunlight exposure and vitamin D, and the availability of nutrients have been proposed as possible explanations for the seasonality of births in schizophrenia. However, to date, no specific agent has been identified," conclude the authors.

Source: October issue of The Archives of General Psychiatry, one of the JAMA/Archives journals as announced at Eureka Alert.


Comments

what do they consider to be winter births...?

what do they consider to be summer births..?

and does that vary by area of the country?

Posted by: at October 7, 2004 05:03 PM

In the Northern hemisphere I believe that Winter Births are typically January through March or April, Summer would be May through August.

The lowest rate of schizophrenia is associated with births in the months September through November. Let me find the exact graph for everyone and we'll post it here.

And yes - it depends upon where you are on the world - given that winter and summer fall on different months in different parts of the world.

Posted by: Admin at October 7, 2004 05:46 PM

i was born in Tennessee on March 5th....would that be winter or spring?

Posted by: at October 8, 2004 04:10 PM

I was born in December in H.K. Would that be winter?

Posted by: S. C. at October 13, 2004 10:37 AM

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