Quick Answer: Do Cross Sectional Studies Have A Control Group?

Why are cross sectional studies bad?

Non-response is a particular problem affecting cross-sectional studies and can result in bias of the measures of outcome.

This is a particular problem when the characteristics of non-responders differ from responders.

Recall bias can occur if the study asks participants about past exposures..

How long do cross sectional studies last?

By definition a cross-sectional study is meant provide a snap shot of some particular phenomenon at a point in time. Five years would probably blur the image (depending on the data). However, there is no reason that research cannot be conducted over a five year period, you can simply describe your study differently.

Can a study be both cross sectional and longitudinal?

Cross-sectional study Both the cross-sectional and the longitudinal studies are observational studies. This means that researchers record information about their subjects without manipulating the study environment.

Why are controls needed in a case control study?

Why are controls needed in a case-control study? they do not have the outcome of interest and allow for estimation of exposure frequency among those without the disease. … In a case-control study of computer display exposure and glaucoma, cases and controls were also asked about television watching habits.

What is the purpose of the control group in a case control study?

The purpose of the control group is to determine the relative size of the exposed and unexposed components of the source population.

What is a cross sectional case control study?

Cross sectional studies are used to determine prevalence. They are relatively quick and easy but do not permit distinction between cause and effect. Case controlled studies compare groups retrospectively. They seek to identify possible predictors of outcome and are useful for studying rare diseases or outcomes.

What type of study has a control group?

Similar to experimental group design studies, clinical trial studies employ an experimental/control group, in which participants are randomly assigned to receive the experimental treatment (e.g., a medication to treat autism symptoms) or a placebo (a sugar pill).

What level of research is a cross sectional study?

Cross sectional study designs and case series form the lowest level of the aetiology hierarchy. In the cross sectional design, data concerning each subject is often recorded at one point in time.

Are cross sectional studies qualitative or quantitative?

Although the majority of cross-sectional studies is quantitative, cross-sectional designs can be also be qualitative or mixed-method in their design.

What are the disadvantages of a cross sectional study?

The disadvantages of cross-sectional study include:Cannot be used to analyze behavior over a period to time.Does not help determine cause and effect.The timing of the snapshot is not guaranteed to be representative.Findings can be flawed or skewed if there is a conflict of interest with the funding source.More items…

Why are case control studies good?

There are many advantages to case-control studies. First, the case-control approach allows for the study of rare diseases. If a disease occurs very infrequently, one would have to follow a large group of people for a long period of time to accrue enough incident cases to study.

Do cross sectional studies have independent variables?

Cross-sectional studies are observational in nature and are known as descriptive research, not causal or relational, meaning that you can’t use them to determine the cause of something, such as a disease. Researchers record the information that is present in a population, but they do not manipulate variables.

How do you choose a control group in a case control study?

Selection of the ControlsThe comparison group (“controls”) should be representative of the source population that produced the cases.The “controls” must be sampled in a way that is independent of the exposure, meaning that their selection should not be more (or less) likely if they have the exposure of interest.

What are the strengths and weaknesses of cross sectional study?

4. Strengths and weaknesses of cross-sectional studiesRelatively quick and easy to conduct (no long periods of follow-up).Data on all variables is only collected once.Able to measure prevalence for all factors under investigation.Multiple outcomes and exposures can be studied.More items…

Why do a cross sectional study?

Cross-sectional designs are used for population-based surveys and to assess the prevalence of diseases in clinic-based samples. These studies can usually be conducted relatively faster and are inexpensive. They may be conducted either before planning a cohort study or a baseline in a cohort study.