Experimental Study Designs: Other non-randomised interventional studies
- Quasi-experiment: In this type of study the exposure is assigned by the investigator, like in a randomized control trial, but the subjects are not randomized.
- Field trial: Much larger than clinical trials because they study therapeutic interventions. For example, the effect of a new vaccine in the incidence of a particular disease. Because the risk of people to have a particular disease is typically low, to test the efficacy of a vaccine a very large sample of individuals is necessary.
- Community trial: An extension of field trials that involves allocation of treatment to a whole group of people (i.e. community). For example water fluoridation was tested by exposing some communities to it and comparing to other communities without this exposure.
