Another reason that you may be seeing wildly differing statistics is that some studies / sites will be talking about *incidence* and some about *prevalence*...
*
Prevalence is a frequently used epidemiological measure of how commonly a
disease or condition occurs in a population. Prevalence measures how much of
some disease or condition there is in a population at a particular point in time. The prevalence is calculated by dividing the number of persons with the disease
or condition at a particular time point by the number of individuals examined.
* The
incidence of a disease is another epidemiological measure. Incidence
measures the rate of occurrence of new cases of a disease or condition.
Incidence is calculated as the number of new cases of a disease or condition in
a specified time period (usually a year) divided by the size of the population
under consideration who are initially disease free.
So, you may be getting confusing information.
Skimming various studies, I came across varying rates quoted from .15% of the population to 1.5% of the population. How come one says 10x more than the other?? It's all in what DATA it is that they are defining.
