This type of study has less validity than an RCT, but it has utility in some circumstances. The problem in this study design is that there is an increased chance that the study groups will be different.
A) Cohort study
B) Nonrandomized controlled trial
C) Cross-sectional study
D) Case series

Question

Quizplus · Accepted Answer

Nonrandomized controlled trials have less validity than randomized controlled trials (RCTs) due to the increased chance that the study groups will be different. However, nonrandomized controlled trials can be useful in situations where RCTs may not be feasible or ethical. Cohort studies and cross-sectional studies are also observational studies, but they do not have a control group, making it more difficult to draw causal conclusions. Case series are descriptive studies that typically involve a small number of cases and provide little or no comparison group.

This Type of Study Has Less Validity Than an RCT