Longitudinal study
A study done over the passage of time. For example, a longitudinal study of children with Down syndrome (trisomy 21) might involve the study of 100 children with this condition from birth to 10 years of age. Also called a diachronic study. The opposite of a cross-sectional (synchronic) study.

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a study in which participants, processes, or systems are studied over time, with data being collected at multiple intervals. The two main types are prospective s. and retrospective s. Cf. cross-sectional s.

Medical dictionary. 2011.

Look at other dictionaries:

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