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Related to cohort design: Longitudinal design


a strategy that directs a researcher in planning and implementing a study in a way that is most likely to achieve the intended goal.
case study design an investigation strategy involving extensive exploration of a single unit of study, which may be a person, family, group, community, or institution, or a very small number of subjects who are examined intensively. The number of variables is usually very large.
cohort design longitudinal design.
cross-sectional design a research strategy in which one or more group(s) of subjects are studied at one given point in time.
experimental design a research design that eliminates all factors that influence outcome except for the cause being studied (independent variable). All other factors are controlled by randomization, investigator-controlled manipulation of the independent variable, and control of the study situation by the investigator, including the use of control groups.
longitudinal design a research strategy in which one or more group(s) of subjects in various stages of development are examined simultaneously with the intent of inferring trends over time. The assumption is that the phenomenon under study progresses with time. Called also cohort design.
methodological design a process used to develop the validity and reliability of instruments to measure constructs used as variables in research.
nonequivalent control group design a study design in which the control group is not selected by random means.
partial correlation design a design developed to eliminate the influence of a third variable on a relational pattern by holding it constant mathematically, so that the magnitude of the relationship between the two remaining variables can be determined.
path analysis design a design to determine the accuracy of a theoretical model: a hypothesized causal model is developed from the theoretical model and the major variables within it are measured and relationships among them determined; regression analysis is used to determine whether the data are consistent with the model.
survey design a design in which data are collected with questionnaires or through personal interviews with members of an identified population.
time dimensional design an investigation strategy for the examination of sequence and patterns of change, growth, or trends across time; see also prospective study and retrospective study.
trend design a research strategy to examine changes in the general population in relation to a particular phenomenon by means of data collected at predetermined intervals of time from different samples selected from the general population.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


(1) See Design configuration (clinical trials).
(2) A design for an application to support an action on electronic records (eClinical trials).
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


See Double-masked design, Enrichment design, Experimental design, Masked study design, Open design, Rational molecular design, Single-masked design, Structure-based design, Universal design, Zelen design.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.


1. To devise, plan, or contrive.
2. the act or result of designing.
[L. designo, to appoint, designate]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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References in periodicals archive ?
The novel use of a matched cohort design allowed us to assess the consistency of findings by study cohort, diagnostic method, and biological medium.
The decision to use a cross-sectional or cohort design should be based on factors such as the purpose of the study, stability of the study population, length of the intervention, importance of verifying exposure, extent of student exposure to the intervention, and potential measurement effects.
Whereas a cross-sectional design is typically used in studies of diagnosis, because the goal of a diagnostic test is to assess presence of disease at 1 point in time, diagnosis may also be assessed within a longitudinal cohort design. (Studies of prognosis or response to therapy typically use longitudinal design; they have features that differ from studies of diagnosis, even if similar principles apply.) In using a longitudinal study to assess markers of diagnosis, a nested case-control analysis has strengths that help avoid many kinds of bias (6, 9), but not all.
We addressed this limitation by using a multi-year cohort design, where the effects of changes in benefits are controlled by interactions of time indicators with cohort membership.
Of the 22 studies selected for evaluation in the systematic review, 17 were retrospective cohort design and five were case control studies.
It uses a multiple cohort design, in which a group of those receiving welfare or at risk of receiving welfare will be followed over time, and their outcomes will be compared.
The study had a birth cohort design: For each month, 2,073-3,180 healthy children and 0-3 7 high-risk children turned 3, 5, 7, and 16 months of age.
* STUDY DESIGN AND VALIDITY The incidence of adverse birth outcomes was assessed through a retrospective cohort design. The risk of miscarriage was determined by a case-control study.
Especially when the absolute risk for disease occurrence is small, a cohort design requires a large cohort to reach adequate numbers of events with sufficient power to estimate the association between exposure and disease, whereas a case-control design obtains approximately the same confidence interval by using all available cases but only a sample of the excessive number of potential controls from the source population.
* STUDY DESIGN AND VALIDITY This is a 2-part study using a prospective cohort design to calculate the incidence of cytologic abnormalities and a randomized double-blinded placebo-controlled design to evaluate the effect of HRT.