NR 503 Final Exam (2 Versions), NR 503 Final Exam Study Guide (2 Versions) , NR 503 Midterm Exam Study Guide (2 Versions) (Newest-2023): Chamberlain College of Nursing

NR 503 Final Exam (2 Versions), NR 503
Final Exam Study Guide (2 Versions) , NR
503 Midterm Exam Study Guide (2
Versions) (Newest-2023): Chamberlain
College of Nursing




### � Core Epidemiology Concepts

Understanding these foundational terms is critical for both the midterm and final exams .

- **Basic Measures:**

- **Incidence:** The number of **new** cases of a disease in a population over a specific period.

- **Prevalence:** The number of **existing** cases (both new and pre-existing) in a population at a
specific point in time.

- **Crude Rates:** Rates applied to an entire population.

- **Screening & Testing:**

- **Sensitivity:** The test's ability to correctly identify those **with** the disease (true positive rate).

- **Specificity:** The test's ability to correctly identify those **without** the disease (true negative
rate).

- **Positive Predictive Value (PPV):** The probability that a person with a positive test truly has the
disease. *Note: PPV is influenced by the prevalence of the disease in the population .*

- **Gold Standard:** A test with 100% sensitivity and specificity against which new tests are
compared.

- **Validity & Bias:**