I recall reading that using a waitlist control group would increase the needed sample size but now I can't find information confirming that impression. Thoughts on this?
Hello Barbara,
If the waitlist control group is used in the analysis for comparison with the treated group (and you've randomized cases to condition), then I don't see how this results in a need for additional cases.
It does mean that more total cases get treated in the long run (which can be costly in terms of time and resources), but the offer of treatment availability is often a key incentive in getting folks to participate in a study in the first place.
Good luck with your work.
I do not see any reasons to why a wait list control would lead to a need to have larger sample size. CBT studies studies using wait list control often results in higher effect sizes compared to studies using active control groups. From that point of view, a wait list control RCT study probably need smaller sample size compared to a study using an active control.
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