title: Is the relationship between supine blood pressure and postural changes in blood pressure artefactual? Results from the Kuopio Ischemic Heart Disease Risk Factor Study.
abstract: OBJECTIVE
  To investigate whether there is an association between initial supine blood pressure and postural changes in blood pressure (standing minus supine blood pressure).
  
  
  METHODS
  Using data from the Kuopio (Finland) Ischemic Heart Disease Risk Factor Study (KIHD), we simulated the problem and found the suggested solution based on the work of Blomqvist. We then applied the Blomqvist correction to the KIHD data with real measurement errors.
  
  
  RESULTS
  The observed regression slope was substantially reduced, indicating that there is no relationship between the initial blood pressure and the postural change in blood pressure.
  
  
  CONCLUSIONS
  Only the broad application of the method of Blomqvist to other data sets will determine the generalizability of the present finding that initial blood pressure is unrelated to the postural change in blood pressure.
authors.affiliation: M.I. Bassett Research Institute, Columbia University, Cooperstown, New York 13326, USA.
authors.forename: T W
authors.initials: TW
authors.lastname: Wilson
authors.forename: R D
authors.initials: RD
authors.lastname: Cohen
authors.forename: P A
authors.initials: PA
authors.lastname: Lachenbruch
authors.forename: M
authors.initials: M
authors.lastname: Wu
authors.forename: G A
authors.initials: GA
authors.lastname: Kaplan
authors.forename: J T
authors.initials: JT
authors.lastname: Salonen
mesh_terms: D000328:Adult; D001794:Blood Pressure / Q000502:physiology*; D001795:Blood Pressure Determination / Q000379:methods*; D006801:Humans; D008297:Male; D008433:Mathematics; D008875:Middle Aged; D011187:Posture / Q000502:physiology*; D011897:Random Allocation; D012189:Retrospective Studies; D012307:Risk Factors