Originally posted by: tk149
The numbers may be accurate, but the hypothesis about seasonal changes being responsible is pretty slim.
Back in the old days, in college, I had a professor (I can't remember if it was in neurobiology or psychology) who told us a true story:
Some researcher was trying to link human sex-drive to seasons. As with most college researchers, his sample population was the students at that college. He found a huge correlation between pregnancies and a certain month of the year. The researcher was ecstatic that he had found this link, and since the correlation was so high, he figured causation must be in there somewhere too. Finally, he thought, here was proof that human sex-drive is linked to some sort of seasonal clock!
Then somebody pointed out to him, that the month in question in which so many pregnancies occurred, happened to be the same month where, every year, a major college football game took place. And every year, a vast number of students went on a roadtrip downstate en masse, loading up numerous cars and buses, and spent the weekend partying their brains out.
Morale of the story: Just 'cuz there's correlation doesn't mean there's causation.