longitudinal study

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longitudinal study

[‚län·jə‚tüd·ən·əl ′stəd·ē]
(psychology)
The study of a group of individuals at regular intervals over a relatively long period of time.

longitudinal study

an investigation which involves making observations of the same group at sequential time intervals. Thus, a longitudinal study of a COHORT of children may be made to assess, for example, the effect of social class on school achievement (see BIRTH COHORT STUDY). Longitudinal studies are used by the National Children's Bureau to document various aspects of children's development in the UK. However, longitudinal studies are not only appropriate for studying human development or change, they may also be used to observe change over time within organizations.

The advantage of longitudinal studies compared with CROSS-SECTIONAL STUDIES is that the causal factor involved in a sequence of changes an be directly explored using data collected before and after changes (e.g. analysis of the effect of changes in the school curriculum). The main disadvantages are the greater expense of repeated study, the possible HAWTHORNE EFFECT of repeated studies and the influence of other changes which may be occurring concurrently (e.g. changes in the school curriculum may take place at the same time as changes in the resourcing of educational services). Compare PANEL STUDY.

References in periodicals archive ?
The purpose of this contract is to provide a project management assistance (amo) for a prospective study on the future of polluted soils and industrial wastelands located on the territory of the douaisis agglomeration community (cad ).
According to the companies, the two additional grants primarily being funded by NIH/NCATS include Children's Hospital Corporation: Prospective study in Angelman syndrome as well as the University of Utah: Prospective study in Myotonic Dystrophy Type 1 to Determine Biomarkers and Clinical Endpoints.
Researchers concluded that in this long-term prospective study of initially healthy men, multivitamin use for >20 years was associated with a lower risk of major CVD events.
In the prospective study, the parents of 266 children who presented with anaphylaxis to two Montreal hospitals were contacted annually thereafter and asked about subsequent allergic reactions.
In a prospective study, the researcher identifies the problem and assumes the cause is known (Polit & Beck, 2014).
Plasma vitamin C level, fruit and vegetable consumption, and the risk of new-onset type 2 diabetes mellitus: the European prospective investigation of cancer--Norfolk prospective study.
A prospective study of maternal and fetal outcome in acute Lassa fever infection during pregnancy.
Increased risk of incident HIV during pregnancy in Rakai, Uganda: a prospective study.
The results of the Dutch study are consistent with those of a retrospective Mayo Clinic study and a smaller prospective study.
A prospective study in rural Pakistan finds that mothers who became depressed shortly before or after giving birth had babies far more likely to experience stunted growth and bouts of diarrhea than were babies with psychologically healthy mothers.
In Class I clinical research, evidence is provided through a blinded, prospective study including a broad spectrum of patients with a suspected condition and using a "gold standard" for case definition.
This is the first prospective study to make this link," cautions study author Simin Liu.

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