Blueskygirl wrote:
lasirena wrote:
I've heard of a study that correlated mental disorders as being more common in individuals born at certain times of year. The hypothesis was that different levels of light (day length) has an effect on the brain development in the womb.
I was born in November (week of charm, ha ha). It would be interesting if there was a higher incidence of ASD related to birth date, but I suspect we are all over the place.
As to that study, sorry I can't provide a link. I don't remember where I heard about it.
I see a neurologist due to Multiple Sclerosis. I forgot how this came up, but at one appointment he mentioned that a majority of people who have narcolepsy are born in March. He mentioned how it was in a medical journal.
I did a little research on that. This is form
www.journalsleep.org
Evidence that environmental factors may act during early
development was provided in three recent studies showing
unusual birth patterns in narcolepsy patients from the Northern
hemisphere.8-10Okun et al. provided data suggestive of a March
peak and September trough in 484 narcolepsy-cataplexy births.8
In a subsequent report based on analyses of databases from clin-
ics in the U.S., Canada, and France, Dauvilliers et al. found in a
significant excess of births in March (11.9%) and a significant
fall-off in births in September (5.6%) in 886 narcolepsy-cata-
plexy births (including 377 from the Okun et al initial sample).9
Finally, Dahmen et al, studying 511 German narcoleptic patients,
found a season of birth effect with a maximum between March
and June and a minimum in September.10Seasonal birth patterns
have been found for other CNS disorders such as Parkinson’s dis-
ease and schizophrenia.
This was not the study I was referring to. If I remember correctly it was based on statistical data from Sweden (could have wrong country). Common practice there to keep a record of birth date on the files of patients with mental disorders (think study mentioned schizophrenia and bipolar). Sorry I can't be more specific, it's been a few years.