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2016 ; 61
(3
): 261-4
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Methodology Series Module 3: Cross-sectional Studies
#MMPMID27293245
Setia MS
Indian J Dermatol
2016[May]; 61
(3
): 261-4
PMID27293245
show ga
Cross-sectional study design is a type of observational study design. In a
cross-sectional study, the investigator measures the outcome and the exposures in
the study participants at the same time. Unlike in case-control studies
(participants selected based on the outcome status) or cohort studies
(participants selected based on the exposure status), the participants in a
cross-sectional study are just selected based on the inclusion and exclusion
criteria set for the study. Once the participants have been selected for the
study, the investigator follows the study to assess the exposure and the
outcomes. 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. These
types of designs will give us information about the prevalence of outcomes or
exposures; this information will be useful for designing the cohort study.
However, since this is a 1-time measurement of exposure and outcome, it is
difficult to derive causal relationships from cross-sectional analysis. We can
estimate the prevalence of disease in cross-sectional studies. Furthermore, we
will also be able to estimate the odds ratios to study the association between
exposure and the outcomes in this design.