RDN Research and Evidence-Based Practice

Question 1

A systematic review with meta-analysis is considered which level of evidence in evidence-based dietetics practice?

Accepted Answer

Level I — the highest level of evidence

Answer

Systematic reviews with meta-analyses represent Level I evidence, the highest quality in evidence-based practice hierarchies, because they synthesize data from multiple high-quality studies.

Question 2

In a randomized controlled trial (RCT), what is the PRIMARY purpose of randomization?

Accepted Answer

To eliminate selection bias and ensure group comparability

Answer

Randomization distributes known and unknown confounders equally between groups, reducing selection bias and ensuring the groups are comparable at baseline.

Question 3

A study reports a p-value of 0.03. This BEST indicates that:

Accepted Answer

There is a 3% probability the observed results occurred by chance alone if the null hypothesis is true

Answer

A p-value of 0.03 means there is a 3% probability of obtaining the observed results (or more extreme) if the null hypothesis were true, indicating statistical significance at the 0.05 level.

Question 4

A 95% confidence interval for a relative risk is reported as 1.2–3.4. This means:

Accepted Answer

We are 95% confident the true relative risk lies between 1.2 and 3.4

Answer

A 95% confidence interval means that if the study were repeated 100 times, approximately 95 of the resulting intervals would contain the true population parameter.

Question 5

A malnutrition screening tool has high sensitivity. This PRIMARILY means the tool:

Accepted Answer

Correctly identifies most people WITH malnutrition (high true positive rate)

Answer

Sensitivity is the ability of a test to correctly identify true positives — in this case, patients who actually have malnutrition.

(RDN) Registered Dietitian Nutritionist Practice Test

(RDN) Registered Dietitian Nutritionist Practice Test

RDN Research and Evidence-Based Practice