nested study

nested study

a study, usually case control, which recruits study subjects from a population whose characteristics are known because its members are already the subjects of an existing larger study (for example, a cohort study or a large randomized controlled trial).
References in periodicals archive ?
Additionally, a nested study on 34 patients to evaluate the accuracy and feasibility of transmission of echo pictures and heart sounds to Amrita Institute of Medical Sciences, Kochi via satellite using Indian Satellite Research Organization's network was also carried out.
The nested study population included 248 women who met criteria for preeclampsia and 679 women without preeclampsia who were control subjects.
The GISSI-HF was a nested study designed to test two hypotheses.
Genelabs previously completed a one-year Phase III clinical trial, designated Study GL95-02, which included a nested study that indicated that the group of patients receiving Prestara had increased bone mineral density, compared to a decrease in bone density for the group of patients on placebo.