Longitudinal studies involve what characteristic?

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Longitudinal studies involve following the same group of participants over an extended period and taking measurements at multiple time points. This approach lets you observe how outcomes develop, change, or persist within individuals, and helps establish temporal relationships (which factor precedes another). It’s different from assessing different groups at one time point (cross-sectional), from randomly assigning interventions (an experimental design), and from cross-sectional snapshots that capture only a single moment. The strength lies in tracking changes within the same subjects over time.