Biostatistics - Study Design

This set of flashcards covers key concepts, definitions, and study designs in biostatistics and their relevance to clinical research.

What is the primary goal of biostatistics in clinical research?

To help design studies that can answer specific research questions and evaluate hypotheses.

What does a study design provide for researchers?

A plan that allows researchers to collect data to evaluate a study hypothesis.

What framework is emphasized for writing clinical research questions?

The PICO format.

What are the four components identified of Evidence-Based Medicine (EBM)?

Best Research Evidence, Clinical Expertise, Patient Values.

What does the 'P' in PICO stand for?

Population or patient.

What aspect of research questions are most novice practitioners focused on?

Background questions.

What type of study design is best suited for therapy questions?

Randomized Controlled Trials (RCTs).

What are potential biases in study designs that a researcher needs to consider?

Selection bias, performance bias, attrition bias.

In the hierarchy of evidence, which study design is considered the gold standard?

Randomized Controlled Trials (RCTs).

What is the main difference between descriptive and analytic research?

Descriptive research focuses on describing the current state, while analytic research aims to explain why and how phenomena occur.

What is the benefit of using a cohort study?

To determine outcomes associated with exposure variables.

What does a case-control study seek to identify?

Potential risk factors of diseases or outcomes.

What is a significant limitation of cross-sectional studies?

They cannot determine cause and effect.

What does the 'T' in PICOTS stand for?

Time frame over which the outcome is measured.

What is one advantage of using a randomized controlled trial?

It limits confounding and bias.

In a case-control study, what defines the cases?

Subjects with the outcome of interest.

What is the key measure used in cohort studies?

Incidence of disease.

What type of study design is best to test a new drug's efficacy?

Randomized Controlled Trial (RCT).

What can minimize investigator bias in a study?

Blinding.

In which type of study do researchers not assign exposure status?

Observational studies.

What is selection bias in the context of study design?

Preferential enrollment of specific patients into treatment groups.

What is the primary objective of randomized controlled trials?

To determine cause and effect relationships.

What is one disadvantage of randomized controlled trials?

Cost and ethical considerations.

What are the advantages of case series studies?

Useful when RCTs are not ethical; they provide insights based on actual practice.

Which study design provides a snapshot of a population at one point in time?

Cross-sectional study.

What is the significance of using stratified randomization in a clinical study?

To ensure that patients with important characteristics are assigned equally.

What potential risks can arise with non-compliance in an experimental study?

It can bias the study results.

What does double blinding entail?

Both the participants and the researchers are unaware of group assignments.

What type of bias is most likely to affect results when one group receives different treatment than another?

Performance bias.

What is attrition bias?

Differential dropout of patients from different treatment groups.

What is the primary outcome measure in a cohort study?

The occurrence of specified outcomes in defined populations.

How does case-control design differ from cohort study?

Case-control studies start with an outcome and look back at exposures; cohort studies start with exposures and look forward at outcomes.