Animal Health: Research Methods and the Scientific Process (Study Notes)

What is the key idea of animal health research?

To produce reliable evidence that can guide decisions affecting animal welfare, productivity, and public health.

What does PICO stand for in structuring a research question?

Population, Intervention/Exposure, Comparison, Outcome.

What is a hypothesis?

A testable proposed explanation connecting exposure to an outcome.

What is the null hypothesis?

The hypothesis stating there is no difference or association.

What is the alternative hypothesis?

The hypothesis stating there is a difference or association.

What is the first step in the scientific process cycle?

Define the problem.

What does transparency in research refer to?

Clearly describing decisions regarding inclusion criteria, exclusions, and analysis choices.

What is the difference between causation and association in animal health?

Causation implies a direct link between exposure and outcome, while association indicates two variables vary together without direct causation.

What defines a strong study design for arguing causation?

Strong study design, consistency with biology, and elimination of alternative explanations.

What is a primary source in research?

A report that presents original data, such as a vaccine trial.

Why does peer review matter?

It is a quality filter that helps catch errors, bias, and overconfident conclusions before publication.

What is the hierarchy of evidence?

A ranking of evidence types from well-designed randomized trials and systematic reviews to observational studies.

What is internal validity?

The extent to which the methods used in a study provide unbiased estimates of an effect.

What is external validity?

The extent to which the study findings can be generalized to other settings or populations.

What is pseudoreplication?

Treating non-independent measurements as independent replicates in a study.

What is a confounder?

A third variable that is associated with both exposure and outcome, potentially distorting the association.

Why is sample size important in a study design?

It affects the statistical power, helping detect real effects.

What is the difference between sensitivity and specificity in diagnostic tests?

Sensitivity measures true positive rates, while specificity measures true negative rates.

What is prevalence?

The proportion of existing cases of a condition in a population at a specific time.

What is incidence risk?

The probability of new cases developing in a defined population over a specified time period.

What does RR stand for and what does it measure?

Relative Risk; it compares the risk of an outcome in exposed individuals versus unexposed individuals.

What are positive and negative predictive values?

Positive Predictive Value (PPV) is the probability that an individual with a positive test result truly has the disease. Negative Predictive Value (NPV) is the probability that an individual with a negative test result truly does not have the disease.

What is the difference between screening and confirmatory tests?

Screening tests aim for high sensitivity to catch most cases, whereas confirmatory tests aim for high specificity to ensure true positives.

What are the 3Rs in animal research ethics?

Replacement, Reduction, Refinement.

What is a gold standard in diagnostics?

The best available method for determining true disease status.

What does reliability in measurement refer to?

The consistency of a measurement across different occasions or observers.

What is data management in research?

Practices to ensure quality control from the start, including unique identifiers and consistent recording.

What is research integrity?

The adherence to ethical principles in conducting and reporting research.

Why is statistical significance alone not enough in interpreting data?

It does not measure practical or clinical significance.

What is a confounding variable?

A variable that influences both the independent and dependent variable, potentially skewing results.

What characterizes a case-control study?

It compares individuals with a condition (cases) to those without (controls) to examine prior exposures.

What does incidence rate measure?

The rate of new cases of a disease occurring in a population over a specified time period.

What is the aim of quality assurance in laboratories?

To ensure consistency, reliability, and accuracy in laboratory procedures and results.

What should be included in the Methods section of a scientific paper?

Detailed description of how the study was conducted to allow replication.

What is the risk difference in epidemiology?

The difference in risk of an outcome between two populations.

How does prevalence affect Positive Predictive Value (PPV)?

As prevalence decreases, PPV often decreases, leading to more false positives.

What are the main components of an outbreak investigation?

Confirming the outbreak, verifying diagnosis, defining and identifying cases, generating hypotheses, implementing control measures, and communicating findings.

What is the role of informed consent in animal research?

To ensure participants understand the study procedures, risks, and their right to withdraw.

What is the purpose of humane endpoints in research?

To minimize suffering by establishing criteria for when an animal will be removed from a study.

What should researchers do to communicate findings effectively?

Clearly report methods, results, limitations, and practical implications.

What is the main goal of critical appraisal?

To evaluate the quality and relevance of a study to inform practice and decision-making.

What is a main reason for underpowered studies in animal health?

High costs and logistical challenges often facing animal studies.

How does sample timing affect diagnostic test results?

Timing can influence the accuracy and reliability of test outcomes, particularly in disease detection.

What is the significance of establishing a chain of custody in laboratory work?

To ensure traceability and integrity of samples throughout processing.

What is differential misclassification in diagnostic testing?

A situation where the rate of misclassification differs between study groups, potentially biasing results.

What does ethical reduction mean?

Using the minimum number of animals needed to achieve valid results, ensuring efficiency in study design.

Why is clear communication important in translating evidence to practice?

It ensures that research findings are understood and correctly applied in real-world contexts.