NAHQ CPHQ Practice Exam

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The prevalence rate of a disease depends on the

Incidence and change in the balance of etiological factors
Incidence rate and duration of the disease
Number of new cases and the population at risk
Total number of cases and the population at risk

The correct answer is: Incidence and change in the balance of etiological factors

The correct answer is A because the prevalence rate of a disease is influenced by both the incidence (new cases) of the disease and any changes in the balance of etiological factors (factors causing the disease). The prevalence rate takes into account both existing cases and new cases over a specific period, providing a snapshot of the total disease burden in a population at a given time. Option B only considers the incidence rate and the duration of the disease, which is not comprehensive enough to reflect the overall prevalence rate accurately. Option C focuses solely on the number of new cases and the population at risk, overlooking the impact of etiological factors on disease prevalence. Option D does not consider the influence of changes in the balance of etiological factors, which are essential in determining the prevalence rate.