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Using the SF-36 for characterizing outcome after multiple trauma involving head injury
Ellen J MacKenzie1, Melissa L McCarthy, John F Ditunno
1Center for Injury Research and Policy, The Johns Hopkins School of Hygiene and Public Health, Baltimore, Maryland 21205, USA. emackenz@jhsph.edu
Background:
The purpose of this study was to evaluate the validity of the Medical Outcomes Study 36-Item Short Form Health Survey (SF-36) for examining outcomes after multiple trauma and to investigate whether the addition of items selected to measure cognitive function could improve the sensitivity of the SF-36 for identifying differences in outcomes for patients with and without head injury.
Methods:
One thousand two hundred thirty patients discharged from 12 trauma centers were interviewed 1 year after injury. The interview included the SF-36 supplemented with four items chosen to assess cognitive function.
Results:
The resulting cognitive function scale is internally consistent and measures a component of health that is independent of the dimensions incorporated in the SF-36. It correlates well with established measures of brain injury severity and discriminates among patients with and without brain injury.
Conclusion:
This study underscores the need to supplement the SF-36 with a measure of cognitive function when evaluating outcome from multiple trauma involving head injury. Further studies are needed to validate the specific items chosen for measuring cognitive function.