Adisorder's is the total number of existing and new cases, while a disorder's is the number of new cases that emerge during a period of time.

Prevalence; Incidence.

Explanation:

A disorder's 'prevalence' or pervasiveness can be determined by assessing the number of existing cases of the disorder along with the no. of new cases that add to the existing list while the 'incidence' of an order is affiliated to the number of added new cases of a particular disorder during a particular period of time. Such an observation would help analyze how prevalent the disorder is and by what no. of people it has been increased that would further assist in leading to examine the causes(personal or environmental) and treatment(through medication or therapies) of these disorders as per the scenario.

The correct answer is - Prevalence; and Incidence.

Explanation:

Prevalence is the total number of the cases that emerging or already existed in a population in the reference of the disorders. Prevalence is essential to help in identifying how much disease is widespread.

Incidence is, on the other hand, is the number of new cases in the population at a particular given time period in reference to a disorder or disease. It helps in providing information about the possibilities of contracting with the diseases.

The correct answer is - prevalence and incidence.

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