title: Single-item electronic administration of the SF-36v2 Health Survey.
abstract: OBJECTIVE
  To evaluate the psychometric properties and factor structure of a computerized electronic version of the SF-36v2 Health Survey (SF-36v2) with items administered one-per-page versus the traditional grid format used in the paper-and-pencil version in a sample of physician-diagnosed headache patients.
  
  
  METHODS
  Patients (N = 180) completed the SF-36v2 administered as part of a broader study of health outcomes. Scaling assumptions, reliability, factor structure, and the tool's ability to discriminate between headache pain severity groups were examined.
  
  
  RESULTS
  Frequency distributions showed notable ceiling effects for the role emotional, social functioning, physical functioning, and role physical scales, but negligible (<1.2%) floor effects for any of the scales. Internal consistency reliability coefficients ranged from 0.81 to 0.95 for the eight health domains. Items passed tests of internal consistency and discriminant validity. Principal components' analyses confirmed the 2-factor structure; the pattern of correlations across scales was consistent with expectations for the physical and mental health components. As expected, patients with severe headache pain had lower mean SF-36v2 scores than those with mild or moderate pain. No significant score differences were observed between mild and moderate pain severity groups.
  
  
  CONCLUSIONS
  Single-item electronic administration of the SF-36v2 is reliable and valid for use with headache patients.
authors.affiliation: invivodata, inc., 2100 Wharton Street, Suite 505, Pittsburgh, PA 15203, USA. dtbowker@invivodata.com
authors.forename: Diane M
authors.initials: DM
authors.lastname: Turner-Bowker
authors.forename: Renee N
authors.initials: RN
authors.lastname: Saris-Baglama
authors.forename: Michael A
authors.initials: MA
authors.lastname: Derosa
mesh_terms: D000203:Activities of Daily Living; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003201:Computers; D005260:Female; D006261:Headache / Q000175:diagnosis / Q000523:psychology; D006304:Health Status; D006306:Health Surveys / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care / Q000592:standards* / Q000706:statistics & numerical data; D017060:Patient Satisfaction; D025341:Principal Component Analysis; D011594:Psychometrics / Q000295:instrumentation* / Q000706:statistics & numerical data; D011788:Quality of Life; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires / Q000592:standards*; D055815:Young Adult