A cross-sectional study measures the proportion of individuals in a population who have a disease at a specific point in time. What epidemiological measure does this represent?

Prevalence is the proportion of a population that has a specific condition at a given point in time (point prevalence) or over a defined period (period prevalence). It is calculated as: Prevalence = (Number of existing cases) / (Total population at risk). Cross-sectional studies measure prevalence. Incidence measures the number of NEW cases developing over a period of time in a disease-free population. Relative risk compares disease risk between exposed and unexposed groups and is derived from cohort studies. Attributable risk measures the proportion of disease in the exposed group attributable to the exposure.