a. Incidence b. Prevalence
c. Sensitivity d. Specificity
Ans. B. Prevalence is the proportion of a population affected with a disease at a given point in time, i.e., (cases)/(population). A dentist counts the number of patients presenting to the office with newly diagnosed periodontal disease in a 6-month period. Ten of the 100 people who came to the office had periodontal disease. The incidence rate is calculated as 10/100 in 6 months, or 0.2 per year. The range for incidence rates is from zero to infinity. The prevalence of periodontal disease may be obtained by counting all patients with periodontal disease in the same period—that is, if 50 of the 100 patients have periodontal disease, the prevalence is 50%. Remember, incidence is a rate and requires a unit of time, whereas prevalence is a proportion and is expressed as a percentage of the population.
c. Sensitivity d. Specificity
Ans. B. Prevalence is the proportion of a population affected with a disease at a given point in time, i.e., (cases)/(population). A dentist counts the number of patients presenting to the office with newly diagnosed periodontal disease in a 6-month period. Ten of the 100 people who came to the office had periodontal disease. The incidence rate is calculated as 10/100 in 6 months, or 0.2 per year. The range for incidence rates is from zero to infinity. The prevalence of periodontal disease may be obtained by counting all patients with periodontal disease in the same period—that is, if 50 of the 100 patients have periodontal disease, the prevalence is 50%. Remember, incidence is a rate and requires a unit of time, whereas prevalence is a proportion and is expressed as a percentage of the population.
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