Table 2 Experimental and quasi-experimental study designs
Classification | Category | Study design | Definition |
|---|---|---|---|
Experimental | 1 | Randomised trials | An experimental study in which individuals or groups are allocated to different interventions using methods that are random. |
Quasi-experimental | 2 | Interrupted time-series designs | A study that uses observation at multiple (at least three) time points before and after an intervention. |
3 | Controlled before-after studies | A study in which observations are made before and after the implementation of an intervention, both in a group that receives the intervention and in a control group that does not. | |
4 | Non-randomised studies | A study in which people are allocated to different interventions using methods that are not random. | |
5 | Before-after studies | A study in which observations are made before and after the implementation of an intervention in the same group of individuals. | |
5 | Repeated measure studies | A before-after study in which there are multiple post-intervention time points at which outcome measurements are made [40]. |