QuestionSBA
QuestionChoice
Blinding would reduce bias, thereby increasing internal validity.
10000979
d
Reduces internal validity
QuestionChoice
This reduces the observer bias in a study. This ensures the outcomes of each group are managed in the same way, which reduces bias.
10000976
a
Reduces bias
QuestionChoice
RCTs have high efficacy and internal validity. Efficacy can be defined as the performance of an intervention under ideal and controlled circumstances, whereas effectiveness refers to its performance under 'real-world' conditions. RCTs often lack effectiveness.
10000980
e
Increases effectiveness
QuestionChoice
Blinding does not affect confounding. Randomisation of the groups reduces confounding.
10000978
c
Reduces confounding
QuestionChoice
RCTs have low external validity. External validity is the extent to which the outcomes observed in the study apply to the people outside the sample included in the trial. RCTs may not be generalisable outside of the study group for many reasons, e.g. inclusion criteria for the study may not be representative of the general population.
10000977
b
Increases external validity
Concept
Chapter
2693
3861
Properties of Randomised Controlled Trials
Topic
178
Medical Statistics
12742
During a randomised controlled trial (RCT), the people analysing the data and performing the experiment are blinded so they are unaware of who is in which group.

How does this affect the study?
a