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Definition and calculation method of prevalence in DQ


HI everyone
when I look at the DQ document, I found a problem as shown in the figure below.The prevalence of each disease is different in each region.so the parameters of the prevalence in the following figure are derived from?

Similarly,“plausible value low” and “plausible value high”,why can’t I use 500 instead of 635?how did I get this number and in what way?

@Andrew can you help me answer the question?