Researchers conduct a randomized controlled trial to determine if graduated aerobic physical activity reduces post-operative pain more than a graduated resistance exercise intervention. The primary purpose of blinding the investigators for this trial is to avoid:
a. non-random (differential) misclassification of exposure status
b. observer bias
c. surveillance bias
d. recall bias
Correct answer: option a
Rational:
1. The trial avoids the non random music classification of exposure status. So option a is correct.
2. Observer bias are the type of bias that can affect the assessment in observational and interventional study.
3. Surveillance bias are detection bias.
4. Recall bias are systematic bias in recalling.
Researchers conduct a randomized controlled trial to determine if graduated aerobic physical activity reduces post-operative pain...
Researchers conduct a randomized controlled trial to determine if a regular resistance exercise program improves post-operative function in knee surgery patients compared to patients who undergo an aerobic exercise program. The primary purpose of randomizing patients to each of the interventions in this trial is to avoid? a. recall bias b. selection bias c. surveillance bias d. non-random (differential) misclassification of exposure status e. non-random (differential) misclassification of outcome status