1. The study was of a type that epidemiologists call a case control study . 2. Case control studies are relatively inexpensive and less time consuming than cohort studies.3. The nested case control study can be analyzed using methods for missing covariates. 4. The design of case control studies , looking at past events, generally prevents definitive conclusions. 5. Thus the nested case control study is less efficient than the full cohort design. 6. Since case control studies don't track patients over time, they can't establish relative risk. 7. Prospective studies have many benefits over case control studies . 8. These can include case control studies or prospective studies. 9. Existing studies include a scientific assortment such as registries, case control studies , and clinical trials. 10. The jargon piles up rapidly : case control study , prevented fraction, population attributable risk percent.
