Controlled Before-After Studies

**Definition:** A study in which observations are made before and after an intervention, both in a group that receives the intervention and in a control group that does not.

**Tree numbers:** - E05.318.372.500.812 - N05.715.360.330.500.812 - N06.850.520.450.500.812

**Synonyms:** - Controlled Before and After Studies - CBA Studies