title: Extracting data recorded with OpenSDE: possibilities and limitations.
abstract: OBJECTIVE
  OpenSDE is an application intended to support structured data entry in a variety of settings, such as routine care and clinical research. The past years development has focused on data entry to support expressiveness and flexibility. The focus is now shifting to data extraction: what are the possibilities for extracting the data and does the adopted strategy pose limitations?
  
  
  METHODS
  Data extraction is supported by presenting the concepts for extraction in the same tree structure as for data entry. Users can select all or a sub selection of these concepts for extraction. Selected concepts are extracted and converted to a table format that can be queried using conventional tools.
  
  
  RESULTS
  The extraction tool (entity export) provides a successful technical solution for data extraction. Using the extracted data, however, leads to obstacles that are a result of a fundamental design principle of OpenSDE.
authors.affiliation: Department of Medical Informatics, Ee2157 Erasmus MC, University Medical Center Rotterdam, P.O. Box 1738, 3000 DR Rotterdam, The Netherlands. r.los@erasmusmc.nl
authors.forename: Renske K
authors.initials: RK
authors.lastname: Los
authors.forename: Astrid M
authors.initials: AM
authors.lastname: van Ginneken
authors.forename: Johan
authors.initials: J
authors.lastname: van der Lei
mesh_terms: D003198:Computer Simulation; D016247:Information Storage and Retrieval / Q000379:methods*; D008491:Medical Informatics Applications; D009426:Netherlands; D012107:Research Design; D012985:Software Design