Epidemiological research methods include

Epidemiology is a science that studies the distribution, spread and influence of diseases in the population, and its research methods are mainly as follows:

1. Case-control study: This method compares the differences of some exposure factors between a group of patients and a group of non-patients to explore the relationship between these factors and diseases.

2. Longitudinal study: This method tracks the changes of the same population, compares the data at different time points, and discusses the relationship between exposure factors and diseases. Mainly used to study the occurrence and development of diseases.

3. Cross-sectional study: This method is mainly used to study the distribution of diseases by investigating people at a specific time and collecting relevant data of exposure factors and diseases.

4. Ecological research: This method studies the relationship between disease and environment, and discusses the influence of natural factors and social factors on disease distribution, such as the relationship between air pollution and disease occurrence.

5. Investigation: This method collects information about diseases and exposure factors through questionnaires and personal interviews, which is mainly used to explore the risk factors of diseases and preventive measures.

6. Experimental study: This method is mainly used to evaluate the effectiveness of preventive and therapeutic measures by controlling exposure factors, comparing the differences between exposed and unexposed groups, and exploring the causal relationship between exposure factors and diseases under laboratory or field conditions.

The above are some basic methods of epidemiological research, which can be combined with different methods to explore the relationship between diseases and exposure factors.