If prevalence = proportion of people in a population who have a disease or attri

Question

If prevalence = proportion of people in a population who have a disease or attribute at a specicified point in time or

over a specific period of time, what would the denominator be? I don't understand why we aren't given total number of

children (not just number of children WITH autism).

Also, if the formula is : all new and preexisting cases during a given time period / population during the same time period x 10n, what is the n? (1,000? 100,000?)

Problem #8 Calculate category statistics: Autism is a disability that is characterized by a severely decreased ability to engage in communication and social interaction. A study was undertaken to establish the prevalence of Autism in a community. Data from this study are reported below: Children Diagnosed With Autism per Age Group Age Group 3-5 6-10 Children With Autism 193,479 175,417 a. Calculate the prevalence rate of autism for the two age categories. b. Calculate the prevalence to a rate per 1,000.

Explanation / Answer

here prevalence(%) =100*number of children with autism/number of children measured

so denominator will be number of children measured or surveyed.

prevalance=(all new and preexisting cases during a given time period / population during the same time period )x 10n, what is the n

if prevalence is per 10 thousand then n=1000

if prevalence is per 10 lakh then n=100,000

in the problem#8, if number of children surveyed is n then

(a)

prevalnce in age group of 3-5 is given as 193479/n

prevalnce in age group of 6-10 is given as 175417/n

(b)

prevalnce rate per 1000 in age group of 3-5 is given as 1000*193479/n

prevalnce rate per 1000 in age group of 6-10 is given as 1000*175417/n

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