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Re: Vitamin D May Not Be the Answer to SAD » jrbecker76

Posted by Larry Hoover on March 18, 2009, at 14:30:20

In reply to Vitamin D May Not Be the Answer to SAD, posted by jrbecker76 on March 18, 2009, at 11:05:17

I found the abstract, and here are the results:
Results
The prevalence of depressive symptoms was lower in the top tertile of 25(OH)D concentrations compared to the lowest tertile (7.2% vs. 11.1%) in the study population (odds ratio, 0.62; 95% confidence interval, 0.460.83; P for trend = 0.002). This association was substantially attenuated after controlling for various confounding factors, and disappeared after including geographic location in the model. Stratified analysis by location did not find any association between depressive symptoms and 25(OH)D levels among participants from either Beijing or Shanghai.

I'd be really interested to know how it was that they got a highly significant result to disappear, i.e. what were the confounding factors, and how geographical location was presumed to modify the finding. If anyone has access to the full text (Association between depressive symptoms and 25-hydroxyvitamin D in middle-aged and elderly Chinese) , I'd be interested in seeing it.

Regards,
Lar

 

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poster:Larry Hoover thread:885916
URL: http://www.dr-bob.org/babble/20090313/msgs/885952.html