A study was conducted to determine the side effects of 4 anti‐malarial drugs in a group of overseas volunteers in Cameroon.A self‐report questionnaire was given to each
Participant and participation was voluntary.Each participant was asked to indicate
Which drugs they had used and the severity of any side effects they had experienced
Over the past two years.What kind(s) of bias would most likely be present in this
Study? (Select all that apply)
A)Interviewer bias
B)Recall bias
C)Observer bias
D)Misclassification
E)Volunteer bias

Question

Quizplus · Accepted Answer

The fact that people were asked to think back two years will almost
certainly lead to general mismeasurement (D) of side effect frequencies in all groups.
Recall bias (differential recall among the different drug groups) is possible if the groups
differ in ways that could affect their recall (e.g.their disease experience, their jobs, their
qualifications).As there were no outside observers (C) or interviewers (A) those
answers are irrelevant.There would be no volunteer bias (E) in comparisons among the
drug groups, but the rates of side‐effects in the study group could differ from the true
rates in all volunteers if, for example, those who had more side effects were more likely
to participate.

A Study Was Conducted to Determine the Side Effects of 4