Nice post at Vitamin D Survivor April 2012
He graphed the CDC data of peak visits for influenza for a period of 15 years
Hypothesis: Less flu this winter because so many are now taking vitamin D
Baseline = rate during summer + 2 standard deviations
Mean % of patient visits for ILI during non-influenza weeks for the previous three seasons plus two standard deviations.”
This means that the incidence of the flu as defined through the outpatient flu surveillance network for this season was like it was summertime, or non-flu season.
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See also Vitamin D Life
- Overview Influenza and vitamin D which has the following graph