BMAT Research & Evidence-Based Practice 5

Question 1

Recall bias is most likely to affect which type of study?

Accepted Answer

Case-control study

Answer

In case-control studies, cases may recall past exposures differently than controls, systematically distorting the exposure-outcome relationship.

Question 2

A study reports relative risk reduction (RRR) of 50% for a treatment. The baseline risk is 2%. What is the absolute risk reduction (ARR)?

Accepted Answer

1%

Answer

ARR = RRR × baseline risk = 0.50 × 0.02 = 0.01 (1%), illustrating why absolute measures are often more clinically meaningful.

Question 3

Which of the following best describes 'external validity' (generalizability) of a study?

Accepted Answer

The extent to which study findings can be applied to populations beyond the study sample

Answer

External validity refers to how well study results can be generalized to other populations, settings, or time periods.

Question 4

In a randomized controlled trial, double-blinding is used to prevent:

Accepted Answer

Both performance bias (participant behavior) and detection bias (outcome assessment)

Answer

Double-blinding hides treatment allocation from both participants (preventing performance bias) and assessors (preventing detection bias).

Question 5

A systematic review differs from a narrative review primarily because it:

Accepted Answer

Uses predefined search strategies and explicit inclusion/exclusion criteria to minimize bias

Answer

Systematic reviews follow a transparent, reproducible protocol with defined methods, reducing the selective inclusion bias common in narrative reviews.

BMAT - Assessment Practice Test

BMAT - Assessment Practice Test

BMAT Research & Evidence-Based Practice 5