<prompt> Case control study- estimateOnly odds ratioOdds ratio and attributable riskRelative risk, attributable risk, population attributable riskIncidence, Relative risk, and attributable risk  <response>: Only odds ratio 74 - Park 19th 75-Park 20th Case control study generally yields only estimate of RR Odds ratio Cohort study yield incidence, RR as well as Attributable riskADVANTAGES OF CASE CONTROL STUDIES1. Relatively easy to carry out2. Rapid and inexpensive compared with cohort studies3. Required comparatively few subjects4. Particularity suitable to investigate rare disease or disease about which little is known.5. No risk to subjects6. Allows the study of several different etiological factor eg smoking, physical activity, personality characteristics in MI7. Risk factor can be identified, Rational prevention and control programmes can be established8. No attrition problems, because case control studies do not require follow up of individuals into the future9. Ethical problems minimal. 