We made retrospective base-line and prospective outcome observations using the same measures, separated by the intervention.
First, the evaluation is retrospective based on secondary data.
In order to include follow-up data for survival analysis in the project, the study design was retrospective, based on cancers diagnosed in 1997.
A retrospective data base study was conducted in patients hospitalized in 106 French ICUs between 1 January 1998 and 31 December 1999.
This present study is a retrospective data base analysis; no a priori inclusion or exclusion criteria were applied.
This study was retrospective and based on a historical cohort.
Patients and methods It is a retrospective study based on a case study.
Study design: A retrospective study based on data collected from members of the Dutch Association of Marfan patients.
Design: a retrospective study based on a prospectively updated database in a University hospital.
All studies on dietary intake were retrospective and based on questionnaires.
