Comprehensive Public Health Principles, Epidemiology, and Health Systems

Vocabulary practice flashcards covering fundamental public health concepts, study designs, epidemiology, health systems, behavioral models, environmental risk assessment, and health communication.

Built Environment

The man-made physical surroundings where people live, work, and play, including community design, housing quality, noise levels, and the availability of safe, walkable spaces.

Social Determinants of Health

The conditions in which people are born, grow, live, work, and age—categorized by Healthy People 2030 into economic stability, education access and quality, social and community context, neighborhood and built environment, and healthcare access and quality—that influence health inequities.

Assessment

A core public health function that systematically collects, assembles, and analyzes health information and disease distribution across populations, serving as the population-level analogy to clinical disease diagnosis.

Policy Development

A core public health function dedicated to developing strategic approaches, plans, and laws to promote and protect community health, serving as the population-level analogy to a prescribed clinical treatment plan.

Assurance

A core public health function that guarantees essential health services, regulatory enforcement, and a competent workforce to protect health across the community, serving as the population-level analogy to administering treatment.

10 Essential Public Health Services

A framework created in 2020 centered around equity that outlines ten fundamental public health activities across assessment, policy development, and assurance to protect and promote the health of all people in all communities.

Tenth Amendment

The constitutional provision establishing that powers not delegated to the federal government are reserved to the states, placing the primary legal responsibility and authority for public health at the state level.

Interstate Commerce Clause

A clause in the U.S. Constitution providing the federal government the legal authority to regulate trade across state boundaries, justifying federal regulatory public health agencies such as the Food and Drug Administration (FDA).

Centers for Disease Control and Prevention (CDC)

A federal agency established in 1946 that initially focused on infectious disease outbreaks and has since expanded its mission to monitor chronic diseases, injuries, environmental health, and disease prevention.

National Institutes of Health (NIH)

A premier biomedical research organization tracing its origins to the 1887 Marine Hospital Service, comprised of 27 institutes and centers devoted to basic, clinical, and translational research.

Food and Drug Administration (FDA)

A federal regulatory agency established in 1931 that protects public health by evaluating and monitoring the safety and effectiveness of drugs, biological products, medical devices, food, cosmetics, and tobacco.

World Health Organization (WHO)

A specialized agency of the United Nations founded in 1948 to coordinate international public health responses, control epidemic and endemic diseases, and establish global health standards.

Prevalence

The total number of existing disease cases in a specified population at a given time point or period, expressed as the number of cases divided by the population at risk.

Incidence

The rate of newly diagnosed cases of a disease in a specified population over a defined period of time, calculated as the number of new cases divided by the population at risk per unit of time.

Years of Potential Life Lost (YLL)

A measure of premature mortality calculated by subtracting an individual's age at death from a predetermined standard reference age (such as $75$ years), which emphasizes causes of death in younger populations.

Disability-Adjusted Life Years (DALY)

A summary metric of overall disease burden representing the loss of healthy life years, calculated by the formula $\text{DALY} = \text{YLL} + \text{YLD}$, where YLL is years of life lost and YLD is years lived with disability.

Endemic

A disease or condition that is constantly present at a steady, baseline rate within a specific geographic area or population group.

Epidemic

A sudden, unexpected increase in the incidence of a disease or health condition within a population that clearly exceeds normal endemic levels.

Public Health Approach to Prevention

A cyclical, evidence-based scientific methodology consisting of five steps: surveillance to define the problem, risk and protective factor research to identify causes, developing and testing interventions, implementing interventions, and evaluating intervention efficacy.

Descriptive Epidemiology

An observational branch of epidemiology focused on assessing the distribution of disease by identifying who is affected, where the condition occurs, and when it happens to generate causal hypotheses.

Analytical Epidemiology

A branch of epidemiology focused on testing hypotheses to determine how and why exposures produce specific health outcomes by investigating determinants, risk factors, and intervention efficacy.

Cohort Study

An observational epidemiological study design where disease-free individuals are enrolled and tracked prospectively or retrospectively over time to evaluate associations between exposures and subsequent outcomes.

Relative Risk (RR)

The ratio of the disease incidence rate in an exposed group to the incidence rate in an unexposed group ($\text{RR} = \frac{\text{Incidence}_{\text{exposed}}}{\text{Incidence}_{\text{unexposed}}}$), measuring the strength of association in cohort studies.

Case-Control Study

An efficient observational epidemiological study design that compares individuals with a disease (cases) to matched individuals without the disease (controls) to retrospectively determine prior exposure history.

Odds Ratio (OR)

A measure of association utilized in case-control studies representing the odds that a case was exposed compared to the odds that a control was exposed, calculated as $\text{OR} = \frac{AD}{BC}$.

Analytical Epidemiology Study Designs

A comparative classification of epidemiological study designs based on temporal directionality relative to the present: cross-sectional (present), prospective cohort (present to future), retrospective cohort (past to present), case-control (retrospective), and intervention (present to future).

Random Error

Unpredictable fluctuations due to biological variation, random sampling error, or measurement error that reduce study precision without introducing systematic directional bias.

Systematic Error (Bias)

A non-random deviation from the true value in study design, data collection, or analysis that compromises study validity, classified into selection bias, information bias, and confounding.

Confounding Variable

An extraneous factor that is associated with the exposure of interest and independently influences the outcome, producing a spurious or distorted association if not properly controlled.

Effect Modification

A biological or epidemiological occurrence in which the effect of an exposure on an outcome varies across different subgroups or levels of a third background variable.

$$p\text{-value}$$

The probability of observing the study results, or results more extreme, assuming the null hypothesis is true; a threshold of $p < 0.05$ is widely adopted as statistical significance.

Clinical Trial Phases

A four-stage experimental testing protocol: Phase 1 evaluates safety and dosage in $20\text{--}80$ people; Phase 2 tests safety and early effectiveness in $100\text{--}300$ people; Phase 3 confirms efficacy across hundreds to thousands; and Phase 4 conducts post-approval surveillance.

Tuskegee Syphilis Study

An unethical 40-year study (1932–1972) conducted by the U.S. Public Health Service that withheld known penicillin treatment and deceived impoverished African American men to observe untreated syphilis, resulting in major human research protection reforms.

Institutional Review Board (IRB)

An independent committee formally designated to review, approve, and monitor biomedical and behavioral research involving humans to ensure ethical standards, safety, and informed consent.

Socioeconomic Status (SES)

The single most potent predictor of population health and mortality, displaying a dose-response gradient across income, education, occupation, and living conditions.

Health Belief Model (HBM)

A behavioral framework that explains individual health behaviors based on demographic modifying factors, perceived susceptibility, perceived severity, perceived threat, perceived benefits versus barriers, self-efficacy, and cues to action.

Self-Efficacy

An individual's confidence in their personal ability to successfully execute the behavior required to produce desired health outcomes.

Social Ecological Model (SEM)

A human behavior framework derived from Bronfenbrenner's ecological theory that addresses health determinants across nested levels of influence: intrapersonal, interpersonal, institutional/organizational, community, and public policy.

Beveridge Model (National Health Service)

A healthcare system model financed entirely through government tax revenue, where the government owns the majority of medical facilities and employs the workforce to provide universal healthcare as a public service.

Bismarck Model (Social Health Insurance)

A multi-payer healthcare system financed jointly by employers and employees through mandatory payroll deductions into universal, non-profit, heavily regulated private insurance sickness funds.

Fee-for-Service

A traditional medical reimbursement model in which healthcare providers are paid separately for each individual service, test, or consultation delivered, creating financial incentives for service volume over care quality.

Value-Based Care

A healthcare reimbursement model that compensates physicians based on patient health outcomes, quality performance metrics, care coordination, and cost containment.

Policy Window of Opportunity

A conceptual model based on Kingdon's framework where three streams—problem identification, potential policy solutions, and political circumstances—converge to open a window that enables policy change.

One Health

A multidisciplinary collaborative approach recognizing that human health is inextricably linked to the health of animals and shared environmental ecosystems, with a primary focus on zoonotic diseases and shared health threats.

Four-Step Risk Assessment Process

An EPA environmental health framework used to characterize potential human health risks through four sequential steps: hazard identification, dose-response assessment, exposure assessment, and risk characterization.

Air Quality Index (AQI)

An EPA environmental scale ranging from Good ($0\text{--}50$) to Hazardous ($\ge 301$) that measures concentrations of ambient air pollutants such as $\text{PM}_{2.5}$ to issue standardized public health warnings.

SUCCESs Model

A health communication framework for crafting memorable messages by ensuring they are Simple, Unexpected, Concrete, Credible, Emotional, and framed around Stories.

Infodemic

A rapid, overwhelming proliferation of both accurate and inaccurate information during a health emergency that produces public confusion, mistrust, and difficulty in identifying trustworthy health guidance.

Misinformation vs. Disinformation

A distinction in health communication where misinformation refers to the unintentional sharing of inaccurate information, while disinformation denotes the deliberate creation and propagation of falsehoods to cause harm.

WHO Communicating for Health Framework

A strategic health communication framework emphasizing six core principles to ensure public impact: accessible, actionable, credible, relevant, timely, and understandable messaging.