To identify the causes of disease

To evaluate the effectiveness of treatments

To study the natural history of disease

To develop new diagnostic tests

A randomized controlled trial

A cohort study

A case-control study

A meta-analysis

Cohort studies follow people over time, while case-control studies compare people who have a disease to people who do not.

Cohort studies are more expensive than case-control studies.

Cohort studies are more difficult to conduct than case-control studies.

Cohort studies are less accurate than case-control studies.

Cohort studies can identify the causes of disease.

Cohort studies are less expensive than case-control studies.

Cohort studies are easier to conduct than case-control studies.

Cohort studies are more accurate than case-control studies.

Cohort studies are more expensive than case-control studies.

Cohort studies are more difficult to conduct than case-control studies.

Cohort studies are less accurate than case-control studies.

Cohort studies cannot identify the causes of disease.

To combine the results of multiple studies

To identify the causes of disease

To evaluate the effectiveness of treatments

To develop new diagnostic tests

Observational studies cannot identify the causes of disease.

Observational studies are subject to bias.

Observational studies are expensive to conduct.

Observational studies are difficult to interpret.

Observational studies can be used to study rare diseases.

Observational studies are less expensive than experimental studies.

Observational studies are easier to conduct than experimental studies.

Observational studies can be used to study the natural history of disease.

Incidence is the number of new cases of a disease that occur in a population over a period of time, while prevalence is the number of existing cases of a disease in a population at a given time.

Incidence is the number of deaths from a disease that occur in a population over a period of time, while prevalence is the number of existing cases of a disease in a population at a given time.

Incidence is the number of new cases of a disease that occur in a population over a period of time, while prevalence is the number of new deaths from a disease that occur in a population over a period of time.

Incidence is the number of existing cases of a disease in a population at a given time, while prevalence is the number of deaths from a disease that occur in a population over a period of time.

A risk factor is a factor that increases the likelihood of developing a disease, while a cause of disease is a factor that is necessary for the development of a disease.

A risk factor is a factor that decreases the likelihood of developing a disease, while a cause of disease is a factor that is necessary for the development of a disease.

A risk factor is a factor that increases the likelihood of developing a disease, while a cause of disease is a factor that is sufficient for the development of a disease.

A risk factor is a factor that decreases the likelihood of developing a disease, while a cause of disease is a factor that is sufficient for the development of a disease.

A relative risk is the ratio of the incidence of a disease in a group exposed to a risk factor to the incidence of the disease in a group not exposed to the risk factor, while an absolute risk is the difference in the incidence of the disease between a group exposed to a risk factor and a group not exposed to the risk factor.

A relative risk is the ratio of the prevalence of a disease in a group exposed to a risk factor to the prevalence of the disease in a group not exposed to the risk factor, while an absolute risk is the difference in the prevalence of the disease between a group exposed to a risk factor and a group not exposed to the risk factor.

A relative risk is the ratio of the incidence of a disease in a group exposed to a risk factor to the prevalence of the disease in a group not exposed to the risk factor, while an absolute risk is the difference in the incidence of the disease between a group exposed to a risk factor and a group not exposed to the risk factor.

A relative risk is the ratio of the prevalence of a disease in a group exposed to a risk factor to the incidence of the disease in a group not exposed to the risk factor, while an absolute risk is the difference in the prevalence of the disease between a group exposed to a risk factor and a group not exposed to the risk factor.

In a cohort study, the researcher follows a group of people over time to determine the incidence of a disease, while in a case-control study, the researcher compares people who have a disease to people who do not.

In a cohort study, the researcher follows a group of people over time to determine the prevalence of a disease, while in a case-control study, the researcher compares people who have a disease to people who do not.

In a cohort study, the researcher follows a group of people over time to determine the risk of developing a disease, while in a case-control study, the researcher compares people who have a disease to people who do not.

In a cohort study, the researcher follows a group of people over time to determine the cause of a disease, while in a case-control study, the researcher compares people who have a disease to people who do not.

In a cross-sectional study, the researcher collects data from a group of people at a single point in time, while in a longitudinal study, the researcher collects data from the same group of people over time.

In a cross-sectional study, the researcher collects data from a group of people at a single point in time, while in a longitudinal study, the researcher collects data from different groups of people over time.

In a cross-sectional study, the researcher collects data from a group of people at a single point in time, while in a longitudinal study, the researcher collects data from the same group of people at different points in time.

In a cross-sectional study, the researcher collects data from a group of people at a single point in time, while in a longitudinal study, the researcher collects data from different groups of people at a single point in time.

In a case-control study, the researcher compares people who have a disease to people who do not, while in a cohort study, the researcher follows a group of people over time to determine the incidence of a disease.

In a case-control study, the researcher compares people who have a disease to people who do not, while in a cohort study, the researcher follows a group of people over time to determine the prevalence of a disease.

In a case-control study, the researcher compares people who have a disease to people who do not, while in a cohort study, the researcher follows a group of people over time to determine the risk of developing a disease.

In a case-control study, the researcher compares people who have a disease to people who do not, while in a cohort study, the researcher follows a group of people over time to determine the cause of a disease.