IBCLC IBCLC - Certification Research and Evidence-Based Practice 1

Question 1

What study design is considered the gold standard for evaluating the effectiveness of a breastfeeding intervention?

Accepted Answer

Randomized controlled trial

Answer

Randomized controlled trials minimize bias through random assignment and are the gold standard for evaluating clinical interventions.

Question 2

In evidence-based practice, a systematic review of randomized controlled trials represents which level of evidence?

Accepted Answer

Level I

Answer

Systematic reviews and meta-analyses of RCTs are classified as Level I evidence, the highest level in the evidence hierarchy.

Question 3

What does NNT (number needed to treat) represent in clinical research?

Accepted Answer

The number of patients who must receive treatment for one to benefit

Answer

NNT is the number of patients who need to receive a treatment for one additional patient to benefit compared to a control condition.

Question 4

Which statistical measure indicates the strength and direction of a relationship between two variables?

Accepted Answer

Correlation coefficient

Answer

A correlation coefficient (r) ranges from -1 to +1 and indicates both the strength and direction of a linear relationship between two variables.

Question 5

Which bias occurs when study participants alter their behavior because they know they are being observed?

Accepted Answer

Hawthorne effect

Answer

The Hawthorne effect occurs when participants change their behavior as a result of being aware that they are under observation.

IBCLC - Certification Exam Practice Test