NR503 Midterm Exam Study Guide (2
Versions, Newest-2023)/ NR 503
Midterm Exam Study Guide: Population
Health, Epidemiology & Statistical
Principles: Chamberlain College of
Nursing
## Quick Reference: Key Formulas & Interpretations
| Concept | Formula | Key Interpretation |
| :--- | :--- | :--- |
| **Sensitivity** | TP / (TP + FN) | Ability to correctly identify those **with** disease |
| **Specificity** | TN / (TN + FP) | Ability to correctly identify those **without** disease |
| **PPV** | TP / (TP + FP) | Probability a positive test truly has disease (affected by prevalence) |
| **Incidence** | New cases / Population at risk | NEW cases over time period |
| **Prevalence** | All cases / Population | ALL existing cases at a point in time |
| **Relative Risk** | Incidence exposed / Incidence unexposed | Used in **cohort** studies; RR=1
means no association |
| **Odds Ratio** | (a/c) / (b/d) | Used in **case-control** studies; estimates risk when incidence
unknown |
---
, ## Domain 1: Foundations & Key Definitions
**Epidemiology** is the study of the distribution and determinants of health-related states in specified
populations . **Population health** focuses on risk, data, demographics, and outcomes .
### Essential Terminology
| Term | Definition |
| :--- | :--- |
| **Morbidity** | Presence of illness in a population |
| **Mortality** | Tracking deaths in an aggregate |
| **Vital statistics** | Data on live births, deaths, fetal deaths, marriages, divorces |
| **Aggregate** | A defined population |
| **Surveillance** | Collection, analysis, and dissemination of data |
| **High-risk** | Increased chance of poor health outcome |
| **Social Justice** | Everyone deserves equal rights and opportunities, including the right to good
health |
### Endemic vs. Epidemic vs. Pandemic
- **Endemic**: Disease regularly found among particular people or in a certain area (e.g., malaria)
- **Epidemic**: Widespread occurrence in a community at a particular time
- **Pandemic**: Disease prevalent over a whole country or the world
### Healthy People 2020 Four Overarching Goals
Versions, Newest-2023)/ NR 503
Midterm Exam Study Guide: Population
Health, Epidemiology & Statistical
Principles: Chamberlain College of
Nursing
## Quick Reference: Key Formulas & Interpretations
| Concept | Formula | Key Interpretation |
| :--- | :--- | :--- |
| **Sensitivity** | TP / (TP + FN) | Ability to correctly identify those **with** disease |
| **Specificity** | TN / (TN + FP) | Ability to correctly identify those **without** disease |
| **PPV** | TP / (TP + FP) | Probability a positive test truly has disease (affected by prevalence) |
| **Incidence** | New cases / Population at risk | NEW cases over time period |
| **Prevalence** | All cases / Population | ALL existing cases at a point in time |
| **Relative Risk** | Incidence exposed / Incidence unexposed | Used in **cohort** studies; RR=1
means no association |
| **Odds Ratio** | (a/c) / (b/d) | Used in **case-control** studies; estimates risk when incidence
unknown |
---
, ## Domain 1: Foundations & Key Definitions
**Epidemiology** is the study of the distribution and determinants of health-related states in specified
populations . **Population health** focuses on risk, data, demographics, and outcomes .
### Essential Terminology
| Term | Definition |
| :--- | :--- |
| **Morbidity** | Presence of illness in a population |
| **Mortality** | Tracking deaths in an aggregate |
| **Vital statistics** | Data on live births, deaths, fetal deaths, marriages, divorces |
| **Aggregate** | A defined population |
| **Surveillance** | Collection, analysis, and dissemination of data |
| **High-risk** | Increased chance of poor health outcome |
| **Social Justice** | Everyone deserves equal rights and opportunities, including the right to good
health |
### Endemic vs. Epidemic vs. Pandemic
- **Endemic**: Disease regularly found among particular people or in a certain area (e.g., malaria)
- **Epidemic**: Widespread occurrence in a community at a particular time
- **Pandemic**: Disease prevalent over a whole country or the world
### Healthy People 2020 Four Overarching Goals
