title: The Japanese version of the modified ACR preliminary diagnostic criteria for fibromyalgia and the fibromyalgia symptom scale: reliability and validity.
abstract: OBJECTIVE
  The aim of this study is to investigate the reliability and validity of the Japanese version of the modified American College of Rheumatology (ACR) Preliminary Diagnostic Criteria for Fibromyalgia (mACR 2010-J) and the Fibromyalgia Symptom Scale (mFS-J).
  
  
  METHODS
  According to the ACR 1990 classification criteria, patients with chronic pain were divided into the fibromyalgia group and nonfibromyalgia group (rheumatoid arthritis and osteoarthritis). Patients in both groups were assessed using mACR 2010-J and mFS-J.
  
  
  RESULTS
  294 of 462 (64 %) patients in the fibromyalgia group met mACR 2010-J, whereas 4 % (9/231) of the nonfibromyalgia group did, with sensitivity of 64 %, specificity of 96 %, positive predictive value of 97 %, negative predictive value of 56 %, and positive likelihood ratio of 16.3. Mean total scores on mFS-J significantly differentiated the fibromyalgia from the nonfibromyalgia group. According to the value of the Youden index, the best cutoff score for the mFS-J was 9/10.
  
  
  CONCLUSIONS
  Our findings indicate that mACR 2010-J as a positive test and mFS-J as a quantification scale might be suitable for assessing fibromyalgia among Japanese chronic pain populations.
authors.affiliation: Department of Psychiatry, Juntendo University Nerima Hospital, 3-1-10 Takanodai, Nerima-ku, Tokyo, 177-8521, Japan, chiec@juntendo.ac.jp.
authors.forename: Chie
authors.initials: C
authors.lastname: Usui
authors.forename: Kotaro
authors.initials: K
authors.lastname: Hatta
authors.forename: Satoko
authors.initials: S
authors.lastname: Aratani
authors.forename: Naoko
authors.initials: N
authors.lastname: Yagishita
authors.forename: Kenya
authors.initials: K
authors.lastname: Nishioka
authors.forename: Teruhisa
authors.initials: T
authors.lastname: Kanazawa
authors.forename: Kenji
authors.initials: K
authors.lastname: Itoh
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Yamano
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nakamura
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Nakajima
authors.forename: Kusuki
authors.initials: K
authors.lastname: Nishioka
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D005356:Fibromyalgia / Q000175:diagnosis*; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D063189:Symptom Assessment / Q000379:methods*