title: The short form-12 and the measurement of health status in patients with cerebral aneurysms: performance, validity, and reliability.
abstract: OBJECTIVE
  Cerebral aneurysms can affect a patient's health status by rupture and stroke, impingement on neural structures, treatment side effects, or psychological stress. The authors assessed the performance, validity, and reliability of the Short Form-12 (SF-12), a self-administered written survey instrument, to assess health status in patients with cerebral aneurysms.
  
  
  METHODS
  A cohort of 170 patients with cerebral aneurysms who were seen at a neurosurgery clinic underwent structured interviews including measurement of their health statuses (SF-12 physical component summary [PCS] and mental component summary [MCS]), functional status (Glasgow Outcome Scale score, modified Rankin Scale score, and Barthel Index), and mental health (Hospital Anxiety and Depression Scale score). The SF-12 scores were compared with US population norms by performing t-tests with unequal variances. The validity of the SF-12 was assessed by comparing the PCS and MCS scores with each patient's functional status and mental health scores by using rank-order methods. Inter-item reliability was assessed using the Cronbach alpha statistic. Patients with cerebral aneurysms had decreased health status PCS and MCS scores when compared with population norms (p < 0.001 for all). A history of subarachnoid hemorrhage (SAH) (p = 0.006) and previous surgical or endovascular treatment (p = 0.047) was associated with worse PCS scores. The validity of the SF-12 was supported by the relationship between the PCS and MCS scores and the patient's functional status and mental health (p < 0.001 for all). The reliability of the SF-12 was documented by the Cronbach alpha statistic (alpha = 0.76).
  
  
  CONCLUSIONS
  Patients with cerebral aneurysms have a diminished physical and mental health status as measured using the SF-12. The presence of SAH and aneurysm treatment are associated with a worse physical health status. The SF-12 is a valid and reliable instrument for measuring health status in patients with cerebral aneurysms.
authors.affiliation: Section of Neurosurgery, Veterans Administration Connecticut Healthcare System, West Haven, Connecticut 06516, USA. Joseph.KingJr@med.va.gov
authors.forename: Joseph T
authors.initials: JT
authors.lastname: King
authors.forename: Michael B
authors.initials: MB
authors.lastname: Horowitz
authors.forename: Amin B
authors.initials: AB
authors.lastname: Kassam
authors.forename: Howard
authors.initials: H
authors.lastname: Yonas
authors.forename: Mark S
authors.initials: MS
authors.lastname: Roberts
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006304:Health Status; D006801:Humans; D007407:Interviews as Topic; D002532:Intracranial Aneurysm / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D011788:Quality of Life; D011996:Records / Q000592:standards*; D015203:Reproducibility of Results; D013345:Subarachnoid Hemorrhage / Q000503:physiopathology