title: Validity and reliability of Seattle angina questionnaire Japanese version in patients with coronary artery disease.
abstract: OBJECTIVE
  The aim of this study was to evaluate the validity and reliability of the Seattle Angina Questionnaire, Japanese version (SAQ-J) as a disease-specific health outcome scale in patients with coronary artery disease.
  
  
  METHODS
  Patients with coronary artery disease were recruited from a university hospital in Tokyo. The patients completed self-administered questionnaires, and medical information was obtained from the subjects' medical records. Face validity, concurrent validity evaluated using Short Form 36 (SF-36), known group differences, internal consistency, and test-retest reliability were statistically analyzed.
  
  
  RESULTS
  A total of 354 patients gave informed consent, and 331 of them responded (93.5%). The concurrent validity was mostly supported by the pattern of association between SAQ-J and SF-36. The patients without chest symptoms showed significantly higher SAQ-J scores than did the patients with chest symptoms in 4 domains. Cronbach's alpha ranged from .51 to .96, meaning that internal consistency was confirmed to a certain extent. The intraclass correlation coefficient of most domains was higher than the recommended value of 0.70. The weighted kappa ranged from .24 to .57, and it was greater than .4 for 14 of the 19 items.
  
  
  CONCLUSIONS
  The SAQ-J could be a valid and reliable disease-specific scale in some part for measuring health outcomes in patients with coronary artery disease, and requires cautious use.
authors.affiliation: Department of Adult Nursing, University of Tokyo, Tokyo, Japan.
authors.forename: Satomi
authors.initials: S
authors.lastname: Seki
authors.affiliation: Department of Adult Nursing, University of Tokyo, Tokyo, Japan.
authors.forename: Naoko
authors.initials: N
authors.lastname: Kato
authors.affiliation: Assistant Professor, Department of Adult Nursing, University of Tokyo, Tokyo, Japan.
authors.forename: Naomi
authors.initials: N
authors.lastname: Ito
authors.affiliation: Associate Professor, Department of Cardiovascular Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Koichiro
authors.initials: K
authors.lastname: Kinugawa
authors.affiliation: Professor, Department of Cardiovascular Surgery, University of Tokyo, Tokyo, Japan.
authors.forename: Minoru
authors.initials: M
authors.lastname: Ono
authors.affiliation: Associate Professor, Department of Cardiovascular Surgery, University of Tokyo, Tokyo, Japan.
authors.forename: Noboru
authors.initials: N
authors.lastname: Motomura
authors.affiliation: Assistant Professor, Department of Cardiovascular Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Yao
authors.affiliation: Assistant Professor, Department of Cardiovascular Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Masafumi
authors.initials: M
authors.lastname: Watanabe
authors.affiliation: Assistant Professor, Department of Cardiovascular Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Imai
authors.affiliation: Assistant Professor, Department of Cardiovascular Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Norihiko
authors.initials: N
authors.lastname: Takeda
authors.affiliation: Assistant Professor, Department of Cardiovascular Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Inoue
authors.affiliation: Department of Cardiovascular Medicine, University of Tokyo, Japan.
authors.forename: Masaru
authors.initials: M
authors.lastname: Hatano
authors.affiliation: Professor, Department of Adult Nursing, University of Tokyo, Tokyo, Japan.
authors.forename: Keiko
authors.initials: K
authors.lastname: Kazuma