Introduction Types Family of epidemiological study designs a Traditional case-control design Case-control studies within cohorts a Nested case-control study design ase-cohort study design Case-parent study design Case-only study design EPIDEMIOLOGY AN EALTH STATISTITypes Family of epidemiological study designs n Traditional case-control design n Case-control studies within cohorts n Nested case-control study design n Case-cohort study design n Case-parent study design n Case-only study design EPIDEMIOLOGY AND HEALTH STATISTICS 1957 卫 Introduction