Epidemiological study designs- Examples of medical sciences

Epidemiology is the study and analysis of distribution and determinants of health-related conditions or events including diseases, and the practice of this study to the control of diseases and other health problems (1). One of the basic issues in epidemiology and the beginning of a research project is conducting a suitable design for our study (2). The aim of this study is to brief explanation the classification of different types of epidemiological studies according to diabetes disease.The researcher should design his/her own study design based on his/her research question, available resources, time and budget. Figure 1 shows the classification of epidemiological studies.