Texas Tech Nutrition Exit Practice Test

Tracking the same individuals and collecting data from them at several points over time is called a longitudinal design. This approach lets you watch how outcomes or characteristics change within the same people, and it helps you see how earlier factors relate to later results, capturing the sequence of events. Cross-sectional studies, by contrast, gather data at one moment in time and don’t follow the same people to observe changes, so they can’t reliably establish temporal relationships. Case-control studies start with people who already have or don’t have the outcome and look backward to exposures, not by following subjects forward in time. Experimental designs involve the researcher giving some intervention or treatment and often randomizing participants, which is a different type of study where more control over variables is exercised than in observational longitudinal tracking.