Two types of intervention studies: aetiological and prevention effectiveness studies
| Aetiological | Prevention effectiveness |
|---|---|
| Large samples | Small samples |
| Endpoint: health/disease | Endpoint: exposure, behaviour |
| Randomisation, blinding | No randomisation or blinding |
| Aetiological theory | Programme theory |
| Quantitative methods | Quantitative and qualitative methods |
| Representative groups and workplaces | Case studies |